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CN106624411A - Method of welding bar-tensioning plate between two workpieces large in heat treatment temperature difference - Google Patents

Method of welding bar-tensioning plate between two workpieces large in heat treatment temperature difference Download PDF

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Publication number
CN106624411A
CN106624411A CN201611169125.2A CN201611169125A CN106624411A CN 106624411 A CN106624411 A CN 106624411A CN 201611169125 A CN201611169125 A CN 201611169125A CN 106624411 A CN106624411 A CN 106624411A
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China
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workpiece
welding
heat treatment
backing plate
plate
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CN201611169125.2A
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CN106624411B (en
Inventor
罗永飞
银润邦
张涛
朱超兵
曾平
吴天峨
莫其鹏
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Dongfang Boiler Group Co Ltd
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Dongfang Boiler Group Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

The invention discloses a method of welding a bar-tensioning plate between two workpieces large in heat treatment temperature difference. The method is a pre-posed step of welding a workpiece A and a workpiece B which are in butt joint, wherein the postweld heat treatment temperature of the workpiece A is greater than that of the workpiece B. The method comprises the steps: S1, pre-heating the to-be-jointed portion of the workpiece A and the workpiece B before overlaying, performing overlaying after pre-heating, and in the overlaying process, pre-welding base plates on the workpiece A and the workpiece B by means of a pre-heating temperature of an overlaying layer; S2, performing postweld heat treatment on the overlaying layer on the workpiece A and the workpiece B, and performing heat treatment together on fillet welds of the base plates and the workpieces; S3, putting the workpiece A and the workpiece B in the to-be-jointed position, and separately welding the two ends of the bar-tensioning plate to base plates of the workpiece A and the workpiece B; S4, performing backing weld between the workpiece A and the workpiece B; and S5, removing the bar-tensioning plate. As the weld joints between the bar-tensioning plate and the base plates do not need heat treatment, adverse effects on the performance of the workpiece B by the heat treatment temperature of the workpiece A are avoided during heat treatment.

Description

The method that reinforcement plate is welded between two big workpiece of the heat treatment temperature difference
Technical field
The invention belongs to welding technology field, is related to the product fixed using reinforcement plate during product group pair, can be used for boiler And the group of the product such as pressure vessel is right.
Background technology
With the raising of power plant auxiliary machine parameter, shell ring material is being improved constantly, No. 0 current high plus and double reheat steam In the products such as cooler, superheat section shell ring has used the high grade material such as 9Cr1MoV, 2.25Cr1MoV, in order to solve superheat section The difficult problem that shell ring cannot be heat-treated after docking with tube sheet, at present the main means for adopting are respectively in superheat section shell ring and tube sheet side Built-up welding austenite material, is docked again after being heat-treated respectively, is no longer heat-treated after docking.
When tube sheet is docked with shell ring, motor-driven submerged arc soldering method is mainly adopted at present, the method is by superheat section shell ring and pipe Plate is individually positioned on two rollers of turning rolls 4, by idler wheel driving start building part rotate complete welding, because two workpiece are located at respectively On two rollers, when bottoming is welded, it is difficult to ensure that two workpiece Complete Synchronizations are rotated, in this case due to backing weld seam very It is thin, can be by drawing crack.Therefore, in order to ensure two workpiece energy synchronous axial systems during bottoming welding, welding equipment reinforcement plate can be generally adopted at present Mode first by two workpiece(Workpiece A 1, workpiece B 2)Connect as one(As shown in Figure 1), afterwards workpiece is again in turning rolls 4 Upper synchronous axial system completes manual welding bottoming welding, and bottoming is to certain thickness(Generally 10-20mm)After with enough bonding strengths, Reinforcement plate is removed again, and whole weld seam is completed using motor-driven submerged arc welding.
But at present, connected using welding reinforcement plate and can often cause problems with by the way of two workpiece:(1)Due to tube sheet and Shell ring has larger cool attenuation, therefore has to first preheat when welding reinforcement plate, is otherwise easy to crackle occur, by In reinforcement plate be keep at a certain distance away welding one piece, preheating be typically all to welding region local preheating, but due to workpiece it is too big, Rapid heat dissipation during preheating, local preheating tends not to ensure that preheating temperature will be easy to crackle occur in place, so, if overall preheating Then cycle length, high cost;(2)Because shell ring and tube sheet have been completed heat treatment before assembling butt weld, subsequently no longer enter Row heat treatment, and if reinforcement plate directly with shell ring and Tube-sheet Welding, by standard regulation need be heat-treated, and reinforcement plate remove Afterwards typically all can locally there is pit in surface of the work, need to carry out the pit on shell ring and tube sheet surface repair welding, and repair welding weld seam is same Sample is also required to heat treatment, so considerably increases cost and production cycle;(3)Due to superheat section shell ring heat treatment temperature compared with Height, and the heat treatment temperature of tube sheet is relatively low, the heat treatment temperature region that both do not overlap, and reinforcement plate welding position distance Weld seam is close, when so causing the reinforcement plate welding position on superheat section shell ring to carry out above-mentioned heat treatment, influences whether tube sheet The performance of material.
The content of the invention
For the problem that current reinforcement plate welding manner is present, i.e., 1)Easily there is crackle in lacing wire plate welding seams, and overall Preheating causes reinforcement plate weld preheating cycle length, high cost again;2)Lacing wire plate welding seams(Including the repair welding for removing workpiece after reinforcement plate Weld seam)Heat treatment high cost, cycle are long;3)And the heat treatment of the higher workpiece of heat treatment temperature can be relatively low to heat treatment temperature The performance of workpiece is adversely affected.It is an object of the present invention to provide a kind of between the workpiece docked by welding The new method of prewelding reinforcement plate, to overcome the problems of above-mentioned current reinforcement plate welding manner.
The technical solution adopted for the present invention to solve the technical problems is:The weldering between two big workpiece of the heat treatment temperature difference is drawn The method of gusset, the method is the preposition operation of butt welding workpiece A and workpiece B, and the post weld heat treatment temperature of wherein workpiece A is big In workpiece B post weld heat treatment temperature and both do not overlap interval heat treatment temperature, comprise the following steps:
S1:Joint carries out the preheating before built-up welding to be treated to workpiece A and workpiece B, in workpiece A and the joint of workpiece B after preheating Built-up welding is Ni-based or overlay cladding of austenite material, during built-up welding overlay cladding, using the preheating temperature of overlay cladding, in workpiece The advance composition backing in position of reinforcement plate to be welded on A and workpiece B;
S2:After the completion of above-mentioned built-up welding and backing plate welding, post weld heat treatment is carried out to the overlay cladding on workpiece A and workpiece B, During the heat treatment, backing plate is also heat-treated in the lump with the angle welding of workpiece;
S3:Workpiece A and workpiece B are placed in after docking location, reinforcement plate one end are welded on the backing plate of workpiece A, the other end It is welded on the backing plate of workpiece B, need to ensures that joint environment temperature is more than or equal to 0 DEG C during welding;
S4:Between workpiece A and workpiece B after the complete all of reinforcement plate of welding equipment, carry out in the groove between workpiece A and workpiece B Backing welding;
S5:After the completion of backing welding, described reinforcement plate is removed, and remove the weld seam remained on backing plate;
S6:Repair welding or polishing are carried out to removing the pit formed on backing plate during reinforcement plate, wherein, without the need for heat treatment after repair welding;
The material and thickness of the backing plate can guarantee that need not be heat-treated after backing plate and lacing wire plate weld, i.e., the material of backing plate and Thickness meets the regulation for exempting post weld heat treatment standard, it is seen that GB 150-2011《Pressure vessel》Part IV page 331 8.2.2.1 table 5 need to carry out the welding point thickness of post weld heat treatment, and the material and thickness of backing plate of the present invention will not in the table In the range of the heat treatment asked.
This method is by the composition backing on workpiece, then the welding equipment reinforcement plate on backing plate(And be not directly welded on workpiece) Workpiece A and workpiece B are connected as a single entity in advance, then backing welding is carried out between workpiece A and workpiece B, removed again after the completion of backing welding Described reinforcement plate, has the advantages that:Because reinforcement plate is welded on backing plate, the welding ring of reinforcement plate and backing plate Border temperature only needs to ensure more than 0 DEG C that postwelding is without the repair welding weld seam being heat-treated and after dismounting reinforcement plate on backing plate Without the need for heat treatment, current lacing wire plate welding seams are solved(Including the repair welding weld seam for removing workpiece after reinforcement plate)Heat treatment high cost, The problem of cycle length, that is, solve the problems, such as described above 2), achieve and substantially reduce the production cycle and significantly reduce system Cause this beneficial effect.Further, since need not heat treatment after reinforcement plate and welding with backing(Including the benefit for removing workpiece after reinforcement plate Welding line), so as to avoid during heat treatment, the workpiece of the higher side of heat treatment temperature(Workpiece A)Relatively low to heat treatment temperature one The workpiece of side(Workpiece B)The adverse effect that causes of performance, that is, solve the problems, such as described above 3).Furthermore, due to backing plate Welding is carried out during workpiece end built-up welding overlay cladding, and using the preheating temperature of overlay cladding the weldering of backing plate and workpiece is completed Connect, therefore, need not individually preheat before backing plate and workpiece welding, the preheating temperature of built-up welding is made full use of, not only ensure that welding with backing Front preheating, is also effectively prevented the generation of welding cold cracking between backing plate and workpiece, and has saved independent preheating backing plate Cost and the cycle, that is, solve the problems, such as described above 1);In the same manner, the post weld heat treatment of backing plate and workpiece is at overlay cladding heat Processed in the lump during reason, for being individually heat-treated compared with backing plate, both reduced heat energy cost, the production cycle is shortened again.
Present invention also offers another kind is in the method for being heat-treated weldering reinforcement plate between two big workpiece of the temperature difference, the method is The post weld heat treatment of the preposition operation of butt welding workpiece A and workpiece B, the wherein post weld heat treatment temperature of workpiece A more than workpiece B Temperature and both intervals of the heat treatment temperatures without coincidence, comprise the following steps:
S1:Joint carries out the preheating before built-up welding to be treated to workpiece A and workpiece B, in workpiece A and the joint of workpiece B after preheating Built-up welding is Ni-based or overlay cladding of austenite material, during built-up welding overlay cladding, using the preheating temperature of overlay cladding, in workpiece The advance composition backing in position of the upper reinforcement plates to be welded of A;
S2:After the completion of above-mentioned built-up welding and backing plate welding, post weld heat treatment is carried out to the overlay cladding on workpiece A and workpiece B, Wherein during being heat-treated to workpiece A, backing plate is also heat-treated in the lump with the angle welding of workpiece A;
S3:Workpiece A and workpiece B are placed in after docking location, reinforcement plate one end is welded on the backing plate of workpiece A, during welding Need to ensure that joint environment temperature is more than or equal to 0 DEG C;
S4:The other end of reinforcement plate is directly welded on workpiece B, needs to preheat the position to be welded of workpiece B before welding, welded Need to be heat-treated weld seam after connecing;
S5:Between workpiece A and workpiece B after the complete all of reinforcement plate of welding equipment, carry out in the groove between workpiece A and workpiece B Backing welding;
S6:After the completion of backing welding, described reinforcement plate is removed, and remove the weld seam remained on backing plate and on workpiece B;
S7:To removing during reinforcement plate, the pit formed on backing plate carries out repair welding or polishing, the pit of the formation on workpiece B Carry out being polishing to rounding off or repair welding, if carrying out repair welding to the pit on workpiece B, heat is carried out to the repair welding weld seam after repair welding Process;
The material and thickness of the backing plate can guarantee that need not be heat-treated after backing plate and lacing wire plate weld, i.e., the material of backing plate and Thickness meets the regulation for exempting post weld heat treatment standard, equally visible GB 150-2011《Pressure vessel》Part IV the 331st Page 8.2.2.1 tables 5 need to carry out the welding point thickness of post weld heat treatment, and the material and thickness of backing plate of the present invention be not in the table Require in the range of heat treatment.
The beneficial effect of above-mentioned technical proposal is:On workpiece A, because reinforcement plate is welded on backing plate, reinforcement plate Only need to ensure more than 0 DEG C with the joint environment temperature of backing plate, postwelding without heat treatment and remove reinforcement plate after backing plate On repair welding weld seam without heat treatment, i.e., current lacing wire plate welding seams are solved on workpiece A(Including workpiece after dismounting reinforcement plate Repair welding weld seam)Heat treatment high cost, the problem of cycle length, that is, problem 2 described above), achieve and shorten production Cycle simultaneously significantly reduces the beneficial effect of manufacturing cost.
In addition, though weld preheating, post weld heat treatment are still needed to when reinforcement plate is welded on workpiece B, but due to workpiece B's Post weld heat treatment temperature of the post weld heat treatment temperature less than workpiece A, therefore, when being heat-treated on workpiece B, can't be to work The performance of part A is adversely affected, that is, solve the problems, such as described above 3).Ibid a technical scheme is the same, due to backing plate and work The welding of part is carried out during workpiece end built-up welding overlay cladding, heat treatment again when overlay cladding is heat-treated in the lump everywhere Reason, therefore prevent the generation of welding cold cracking between backing plate and workpiece, reduce heat energy cost, shorten the production cycle, i.e., Solve the problems, such as described above 1).
Summary the first and second method, that is to say, that in order to avoid lacing wire plate welding seams heat treatment in prior art When, to workpiece B(The relatively low workpiece of heat treatment temperature)Performance adversely affect, in workpiece A(The higher work of heat treatment temperature Part)Upper necessary composition backing, may be selected welding or not composition backing on workpiece B.
In the above described two methods, described backing plate is low-carbon steel material, and thickness is 6-30mm.The backing plate of the material and drawing Without the need for preheating, the weld seam after welding before gusset welding(Including the repair welding weld seam for removing workpiece after reinforcement plate)Without heat treatment.
Further, the thickness of the backing plate is 6-15mm.
In the above described two methods, complete after step S1, the weld dimensions of backing plate need to be detected a flaw.
In the above described two methods, in step S1, the most low coverage of the backing plate of welding apart from associated workpiece butting grooves edge From not less than 20mm.
Further, minimum distance of the backing plate of welding apart from associated workpiece butting grooves edge is 30-150mm.
In the above described two methods, in step S1, the minimum distance of the backing plate of welding apart from the overlay cladding edge is not little In 10mm.
Further, minimum distance of the backing plate of welding apart from the overlay cladding edge is 20-150mm.
In the above described two methods, described reinforcement plate is low-carbon steel material.
In the above described two methods, angle welding has enough pre- when the backing plate width and length can guarantee that welding reinforcement plate Spacing, to avoid weld seam from being welded on workpiece.
Further, the width and length of backing plate is not less than 50mm.
Further, the width and length range of backing plate is:50-200mm.
In the above described two methods, arrangement pitch of each backing plate on workpiece determines according to the position of follow-up reinforcement plate.
It should be noted that, after above-mentioned backing plate is welded on workpiece, without dismantling again, that is, form permanent backing plate.
In sum, in two methods of the present invention, permanent backing plate is welded in advance on workpiece, the permanent backing plate is in work Weld during the built-up welding of part end, be heat-treated together with overlay cladding afterwards, the preheating and heat treatment of backing plate is during overlay cladding Carry out, can saving heat energy and cycle, can guarantee that pre- thermal mass avoids the generation of cold crack again.Next two workpiece are carried out again Group it is right, group to welding before reinforcement plate welding equipment is carried out into backing welding between two workpiece, then, remove reinforcement plate again afterwards and beat Grind permanent pad surfaces carries out repair welding to rounding off or to the pit on backing plate, and postwelding is no longer carried out to permanent backing plate after repair welding Heat treatment, due to not preheating before backing plate and reinforcement plate weldering, postwelding is not heat-treated, therefore has both saved heat energy and cycle, avoids again Impact of the high heat treatment temperature workpiece to the performance of low heat-treatment temperature workpiece.
Description of the drawings
Fig. 1 is the schematic diagram that the current prewelding reinforcement plate for adopting connects two workpiece;
Fig. 2 is the schematic diagram of lacing wire plate weld in embodiment 1;
Fig. 3 is the schematic diagram of lacing wire plate weld in embodiment 2;
It is labeled as in figure:1- workpiece A, 2- workpiece B, 3- reinforcement plates, 4- turning rolls, 5- superheat section shell rings, 6- tube sheets, the Ni-based heaps of 7- Layer, 8- backing plates.
Specific embodiment
The present invention is described in further detail with reference to specific embodiment, but embodiments of the present invention are not limited to This.
By taking certain high-pressure heater as an example, in the high-pressure heater, the material of height plus superheat section shell ring 5 is 12Cr2Mo1VR, Wall thickness is 88mm;The material of tube sheet 6 is the forging of 20MnMoNb IV, and the thickness of docking location is 88mm, and product needed is by superheat section Shell ring 5 is docked with tube sheet 6.Because the heat treatment temperature of 12Cr2Mo1VR and the forging of 20MnMoNb IV differs larger, if directly Cannot be directly heat-treated after docking, be then required for the Ni-based overlay cladding of first built-up welding in the end of superheat section shell ring 5 and tube sheet 6 7, respectively be heat-treated after again by both dock get up, without being heat-treated again after docking.
Advance welding equipment reinforcement plate 3 is needed in docking operation(Material is mild steel), then backing welding is carried out therebetween, should The method that the welding of reinforcement plate 3 employs this patent, for mild steel, thickness is 20mm to the material of the backing plate 8 for being adopted.
Embodiment 1:
The method is comprised the following steps;
S1:The position line for welding reinforcement plate 3 is needed on superheat section shell ring 5 and tube sheet 6, mark is carried out;
S2:The Ni-based overlay cladding 7 of groove surface build-up welding in the end of superheat section shell ring 5, needs to superheat section shell ring 5 before ground floor built-up welding Treat heap welding zone and surrounding preheated, heap is soldered after ground floor, and the temperature of the end of superheat section shell ring 5 is higher, is fully achieved pad The preheating temperature that the welding of plate 8 needs, now in step sl mark carries out the welding of backing plate 8, in superheat section shell ring 5 after welding Upper to form permanent backing plate 8, afterwards built-up welding completes whole Ni-based overlay cladding 7 on superheat section shell ring 5;
S3:100%MT flaw detections are carried out to the angle welding of the backing plate 8;
S4:After flaw detection is qualified, post weld heat treatment is carried out to the Ni-based overlay cladding 7 of superheat section shell ring 5, while in the lump to pad thereon The angle welding of plate 8 is also carried out heat treatment;
S5:Heap welding zone and surrounding are preheated to be treated to the end of tube sheet 6, it is complete in the Ni-based overlay cladding 7 of bevel end surface build-up welding after preheating Post weld heat treatment is carried out to Ni-based overlay cladding 7 into rear;
S6:Superheat section shell ring 5 and tube sheet 6 are placed in and treat docking location, one end of reinforcement plate 3 is welded on into superheat section shell ring 5 On backing plate 8, the other end is directly welded on tube sheet 6(As shown in Figure 2);Only need to ensure environment when reinforcement plate is welded on backing plate 8 Temperature is more than or equal to 0 DEG C, and without the need for preheating before weldering, postwelding is without heat treatment;Need when reinforcement plate 3 is welded on tube sheet 6 The place to be welded of tube sheet 6 is preheated in advance, postwelding also needs to be heat-treated weld seam;
S7:After reinforcement plate 3 is welded, backing welding is carried out between superheat section shell ring 5 and tube sheet 6, backing welding thickness is 10- 20mm;
S8:Remove reinforcement plate 3, and remove the weld seam of the residual on the backing plate 8 of superheat section shell ring 5, and the weldering remained on tube sheet 6 Seam;
S9:Due to leaving pit in backing plate 8 and the surface of tube sheet 6 when reinforcement plate 3 is removed in step S8, this step is to the table of backing plate 8 Face pit carries out repair welding or is polishing to rounding off, need not be heat-treated after repair welding or polishing;The pit on the surface of tube sheet 6 is entered Row repair welding, needs to be heat-treated repair welding weld seam after repair welding.
In said method, distance of the backing plate 8 apart from the bevelled edge of superheat section shell ring 5 need to be ensured not less than 20mm, backing plate 8 away from It is not less than 10mm with a distance from the edge of Ni-based overlay cladding 7.
Embodiment 2:
The method is comprised the following steps;
S1:The position line for welding reinforcement plate 3 is needed on superheat section shell ring 5 and tube sheet 6, mark is carried out;
S2:The Ni-based overlay cladding 7 of groove surface build-up welding in the end of superheat section shell ring 5, needs to superheat section shell ring 5 before ground floor built-up welding Treat heap welding zone and surrounding preheated, heap is soldered after ground floor, and the temperature of the end of superheat section shell ring 5 is higher, is fully achieved pad The preheating temperature that the welding of plate 8 needs, now in step sl mark carries out the welding of backing plate 8, in superheat section shell ring 5 after welding Upper to form permanent backing plate 8, afterwards built-up welding completes whole Ni-based overlay cladding 7 on superheat section shell ring 5;
S3:100%MT flaw detections are carried out to the angle welding of the permanent backing plate 8;
S4:After flaw detection is qualified, post weld heat treatment is carried out to the Ni-based overlay cladding 7 of superheat section shell ring 5, while in the lump to thereon forever Long the angle welding of backing plate 8 is also carried out heat treatment;
S5:Heap welding zone and surrounding are preheated to be treated to the end of tube sheet 6, in the Ni-based overlay cladding 7 of bevel end surface build-up welding after preheating, pad Plate 8 is welded on afterwards in place the mark of tube sheet 6 using the preheating temperature, and permanent backing plate 8 is formed on tube sheet 6 after welding, Afterwards built-up welding completes whole Ni-based overlay cladding 7 on tube sheet 6;
S6:100%MT flaw detections are carried out to the angle welding of the backing plate 8;
S7:After flaw detection is qualified, post weld heat treatment is carried out to the Ni-based overlay cladding 7 of tube sheet 6, while in the lump to backing plate 8 thereon Angle welding is also carried out heat treatment;
S5:Superheat section shell ring 5 and tube sheet 6 are placed in and treat docking location, one end of reinforcement plate 3 is welded on into superheat section shell ring 5 On backing plate 8, the other end is welded on the backing plate 8 of tube sheet 6(As shown in Figure 3), need to ensure that environment temperature is more than or equal to 0 DEG C during welding , without the need for preheating before weldering, postwelding is without being heat-treated;
S6:After reinforcement plate 3 is welded, backing welding is carried out between superheat section shell ring 5 and tube sheet 6, backing welding thickness is 10- 20mm;
S7:Reinforcement plate 3 is removed, and removes the weld seam remained on the backing plate 8 of superheat section shell ring 5 and tube sheet 6;
S8:Due to leaving pit on the surface of backing plate 8 when reinforcement plate 3 is removed in step S7, this step is entered to the surface crater of backing plate 8 Row repair welding is polishing to rounding off, need not be heat-treated after repair welding or polishing.
In said method, distance of the backing plate 8 apart from superheat section shell ring 5 or the bevelled edge of tube sheet 6 need to be ensured not less than 20mm, Distance of the backing plate 8 apart from the edge of Ni-based overlay cladding 7 is not less than 10mm.
In embodiment 1 and embodiment 2, due to increased the permanent backing plate for welding reinforcement plate on workpiece, due to forever Long the material of backing plate is mild steel, and the material of reinforcement plate is also mild steel, therefore reinforcement plate need not be pre- when welding with permanent backing plate Heat, lacing wire plate welding seams(Including the repair welding weld seam for removing workpiece after reinforcement plate)Without heat treatment, solve due to superheat section cylinder Section heat treatment temperature is much larger compared with tube sheet, after causing welding equipment reinforcement plate, when being heat-treated to lacing wire plate welding seams on superheat section shell ring Also substantially reduce without the need for heat treatment without the need for preheating, postwelding before the problem that can be impacted to tube sheet performance, and reinforcement plate weldering Production cycle, significantly reduce manufacturing cost.Further, since the welding of backing plate is carried out during the Ni-based layer of workpiece end built-up welding , post weld heat treatment is also to carry out in the lump with overlay cladding heat treatment, takes full advantage of the preheating temperature of the Ni-based layer of built-up welding, not only The preheating temperature before welding with backing is ensure that, the generation of cold crack is effectively prevented, and greatlys save heat energy cost and life The product cycle.

Claims (9)

1. the method that reinforcement plate is welded between two big workpiece of the heat treatment temperature difference, the method is butt welding workpiece A's and workpiece B The post weld heat treatment temperature of preposition operation, the wherein post weld heat treatment temperature of workpiece A more than workpiece B, and both are without coincidence Heat treatment temperature is interval, it is characterised in that comprise the following steps:
S1:Joint carries out the preheating before built-up welding to be treated to workpiece A and workpiece B, in workpiece A and the joint of workpiece B after preheating Built-up welding is Ni-based or overlay cladding of austenite material, during built-up welding overlay cladding, using the preheating temperature of overlay cladding, in workpiece The advance composition backing in position of reinforcement plate to be welded on A and workpiece B;
S2:After the completion of above-mentioned built-up welding and backing plate welding, post weld heat treatment is carried out to the overlay cladding on workpiece A and workpiece B, During the heat treatment, backing plate is also heat-treated in the lump with the angle welding of workpiece;
S3:Workpiece A and workpiece B are placed in after docking location, reinforcement plate one end are welded on the backing plate of workpiece A, the other end It is welded on the backing plate of workpiece B, need to ensures that joint environment temperature is more than or equal to 0 DEG C during welding;
S4:Between workpiece A and workpiece B after the complete all of reinforcement plate of welding equipment, carry out in the groove between workpiece A and workpiece B Backing welding;
S5:After the completion of backing welding, described reinforcement plate is removed, and remove the weld seam remained on backing plate;
S6:Repair welding or polishing are carried out to removing the pit formed on backing plate during reinforcement plate;
The material and thickness of the backing plate can guarantee that need not be heat-treated after backing plate and lacing wire plate weld.
2. the method that reinforcement plate is welded between two big workpiece of the heat treatment temperature difference, the method is butt welding workpiece A's and workpiece B The post weld heat treatment temperature and both heat without coincidence of preposition operation, the wherein post weld heat treatment temperature of workpiece A more than workpiece B Treatment temperature is interval, it is characterised in that comprise the following steps:
S1:Joint carries out the preheating before built-up welding to be treated to workpiece A and workpiece B, in workpiece A and the joint of workpiece B after preheating Built-up welding is Ni-based or overlay cladding of austenite material, during built-up welding overlay cladding, using the preheating temperature of overlay cladding, in workpiece The advance composition backing in position of the upper reinforcement plates to be welded of A;
S2:After the completion of above-mentioned built-up welding and backing plate welding, post weld heat treatment is carried out to the overlay cladding on workpiece A and workpiece B, Wherein during being heat-treated to workpiece A, backing plate is also heat-treated in the lump with the angle welding of workpiece A;
S3:Workpiece A and workpiece B are placed in after docking location, reinforcement plate one end is welded on the backing plate of workpiece A, during welding Need to ensure that joint environment temperature is more than or equal to 0 DEG C;
S4:The other end of reinforcement plate is directly welded on workpiece B, needs to preheat the position to be welded of workpiece B before welding, welded Need to be heat-treated weld seam after connecing;
S5:Between workpiece A and workpiece B after the complete all of reinforcement plate of welding equipment, carry out in the groove between workpiece A and workpiece B Backing welding;
S6:After the completion of backing welding, described reinforcement plate is removed, and remove the weld seam remained on backing plate and on workpiece B;
S7:To removing during reinforcement plate, the pit formed on backing plate carries out repair welding or polishing, the pit of the formation on workpiece B Carry out being polishing to rounding off or repair welding, if carrying out repair welding to the pit on workpiece B, heat is carried out to the repair welding weld seam after repair welding Process;
The material and thickness of the backing plate can guarantee that need not be heat-treated after backing plate and lacing wire plate weld.
3. the method that reinforcement plate is welded between two workpiece big in the heat treatment temperature difference according to claim 1 and 2, its feature exists In:Described backing plate is low-carbon steel material, and thickness is 6-30mm.
4. the method that reinforcement plate is welded between two workpiece big in the heat treatment temperature difference according to claim 3, it is characterised in that: The thickness of the backing plate is 6-15mm.
5. the method that reinforcement plate is welded between two workpiece big in the heat treatment temperature difference according to claim 1 and 2, its feature exists In:After completing step S1, backing plate is detected a flaw with the weld dimensions of workpiece.
6. the method that reinforcement plate is welded between two workpiece big in the heat treatment temperature difference according to claim 1 and 2, its feature exists In:In step S1, the minimum distance of the backing plate of welding apart from associated workpiece butting grooves edge is not less than 20mm.
7. the method that reinforcement plate is welded between two workpiece big in the heat treatment temperature difference according to claim 6, it is characterised in that: Minimum distance of the backing plate of welding apart from associated workpiece butting grooves edge is 30-150mm.
8. the method that reinforcement plate is welded between two workpiece big in the heat treatment temperature difference according to claim 1 and 2, its feature exists In:In step S1, the minimum distance of the backing plate of welding apart from the overlay cladding edge is not less than 10mm.
9. the method that reinforcement plate is welded between two workpiece big in the heat treatment temperature difference according to claim 8, it is characterised in that: Minimum distance of the backing plate of welding apart from the overlay cladding edge is 20-150mm.
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CN109813056B (en) * 2019-03-06 2024-03-29 刘义 Plate layer for vacuum freeze dryer and preparation method thereof

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