CN103008845A - Novel nano-particle reinforced active tungsten argon arc welding method - Google Patents
Novel nano-particle reinforced active tungsten argon arc welding method Download PDFInfo
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- CN103008845A CN103008845A CN2012105358413A CN201210535841A CN103008845A CN 103008845 A CN103008845 A CN 103008845A CN 2012105358413 A CN2012105358413 A CN 2012105358413A CN 201210535841 A CN201210535841 A CN 201210535841A CN 103008845 A CN103008845 A CN 103008845A
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Abstract
The invention discloses a novel nano-particle reinforced active tungsten argon arc welding method, and belongs to the active welding technology. The method is characterized by comprising the following steps of: before welding, mixing oxide activator powder and nano ceramic particles in proportion, and then adding acetone into the mixture so that the mixture is in pasty; then uniformly coating the pasty activator on the surface of samples by a flat brush, wherein the coating width is about 40mm, and the average coating amount is 5.mg.cm<-2>; and carrying out tungsten argon arc welding after the acetone is volatilized. The external waviness of the welding joints obtained by adopting the nano-particle reinforced active tungsten argon arc welding is smooth; compared with the welding joints obtained by the traditional tungsten argon arc welding, the fusion depth is increased by 110%; the crystal particles of the welding joint fusion region are obviously reduced compared with the active tungsten argon arc welding; and the tensile property of the welding joint is improved by 64.6% compared with the active tungsten argon arc welding. The problems that the tungsten argon arc welding fusion depth of magnesium alloy is shallow and the crystal particles of the active tungsten argon arc welding are thick are solved.
Description
Technical field
A kind of novel nano particle enhanced activity tungsten argon arc welding method.It is characterized in that: before welding, first oxide activating agent powder and nano-ceramic particle are mixed in proportion, then add acetone in the mixture and make it become pasty state.With flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again, coating width is about 40 mm, and the average coating amount of activating agent is 5 mg cm
-2After the acetone volatilization, carry out Gas Tungsten Arc Welding.
Background technology
Magnesium alloy day by day is subject to people and pays close attention to its low-gravity, good processing characteristics, abundant natural reserves.Compare with other metal material and engineering plastics, magnesium alloy has high specific strength and specific stiffness, good damping shock absorption, electromagnetic wave shielding, machining property and casting character.Magnesium alloy will become most important commercial lightweight structural material of 21 century.The extensive use of magnesium alloy must relate to connectivity problem, and welding also receives much concern naturally as a kind of important method of attachment.In a lot of welding methods, such as: TIG weldering, LBW weldering, EBW weldering, FSW weldering etc. have all obtained application in magnesium alloy welding.The TIG weldering is the common method that is welded with non-ferrous metal, stainless steel, nickel-base alloy, titanium alloy etc materials.Its advantage is that welding quality is high, almost can be used for the connection of all metals.But also there is the shortcoming that welding penetration is shallow, production efficiency is low in the TIG weldering.In the 60's of last century, the expert of Ukraine's bar institute of welding affects this phenomenon of weld penetration according to trace element in the weld seam, to contain some micro-activated rosin flux before welding is coated on the surface of the work to be welded and welds, in order to affect the shape of weld seam, thereby reach the purpose of controlling selectively weld shape, achievement in research subsequently progressively forms initial A-TIG welding procedure.Wherein the people such as Marya has studied the impact of chloride on straight polarity direct current A-TIG weldering.The people such as Liu Liming have studied oxide and halide to the impact of AC A-TIG weld.The people such as Xu Jie have studied oxide and chloride can obtain fusion penetration than 3 times of general T IG welderings to the impact application of active agents in the welding of steel that exchanges fill silk A-TIG weldering fusion penetration and seam organization.
More than research mainly solves is the problems such as the more shallow and welding efficiency of the fusion penetration of argon tungsten-arc welding is low, but in the active weldering process of magnesium alloy since the covering of activating agent often the Welded Joints Microstructure and properties cause harmful effect.For example: because the activating agent poor thermal conductivity covers weld pool surface, so that the thermograde in molten bath reduces, the molten bath cooling velocity reduces, and has caused the serious alligatoring of magnesium alloy fusion area crystal grain.This phenomenon all greatly reduces the mechanical property of welding point.Therefore, when adopting the activating gas tungsten argon arc welding to carry out magnesium alloy welding, must research and solve the measure of magnesium alloy fusion area grain coarsening, to obtain having the welding point of good combination property.From the angle of production application, also can alleviate the workload of preparing before the argon tungsten-arc welding weldering, reduce welding cost.Therefore, not only can increase weld penetration and improve appearance of weld but also can strengthen the Novel welding method that is applicable to the magnesium alloy argon tungsten-arc welding of property of welded joint in the urgent need to a kind of.
Summary of the invention
The object of the invention provides a kind of Novel welding method that is applicable to improve the argon arc welding of magnesium alloy activating gas tungsten, the method not only can significantly improve welding point fusion penetration but also can refinement mother metal crystal grain, thereby reach the purpose that improves the welding point tensile property.
Before carrying out traditional Tig Welding, first with welded piece surface carefully polishing and with alcohol wash to remove oxide and greasy dirt.Oxide activating agent powder and nano-ceramic particle are mixed in proportion, then add acetone in the mixture and make it become pasty state.With flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again, coating width is about 40 mm, and the average coating amount of activating agent is 5 mg cm
-2After the acetone volatilization, carry out Gas Tungsten Arc Welding.
Through the experimental study of a large amount of systems, we can draw to draw a conclusion: the argon arc welding of nano-particle reinforcement activating gas tungsten can obviously increase weld penetration, and this is the exercising result of " Marangoni convection current "; And can promote not only that along with the Marangoni convection current enters the molten bath nano-ceramic particle forming core crystallization of weld seam liquid metal reaches the purpose of refinement weld grain, also play the effect of dispersion-strengtherning simultaneously, thereby affect the mechanical property of magnesium alloy weld joint.Advantage of the present invention is the comprehensive function by oxide activating agent powder and nano-ceramic particle, can significantly improve the mechanical property that weld penetration can improve again magnesium alloy weld joint.Extension test is the result show, when adopting the method to carry out the magnesium alloy argon tungsten-arc welding, the ultimate tensile strength of welding point obviously increases.
Description of drawings
Fig. 1 is activating gas tungsten argon-arc welding seam shaping photo.
Fig. 2 is nano-particle reinforcement activating gas tungsten argon-arc welding seam shaping photo.
Fig. 3 is activating gas tungsten argon-arc welding seam cross section fusion penetration photo.
Fig. 4 is nano-particle reinforcement activating gas tungsten argon-arc welding seam cross section fusion penetration photo.
Fig. 5 is activating gas tungsten argon-arc welding seam fusion area microstructure picture.
Fig. 6 is nano-particle reinforcement activating gas tungsten argon-arc welding seam fusion area microstructure picture.
Fig. 7 is the stress-strain diagram of activating gas tungsten argon arc welding and nano-particle reinforcement activating gas tungsten argon arc welding postwelding welding point.
The specific embodiment
Example 1
The oxide activating agent that adopts in the nano-particle reinforcement activating gas tungsten argon arc welding process and the weight proportion of nano-ceramic particle are TiO
2: 60% and nano SiC granule: 40%.First with TiO
2Activating agent powder and nano SiC granule mix in proportion, then add acetone in the mixture and make it become pasty state.With flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again, coating width is about 40 mm, and the average coating amount of activating agent is 5 mg cm
-2After the acetone volatilization, carry out Gas Tungsten Arc Welding.
Be that the AZ31 magnesium alloy plate of 5 mm carries out argon tungsten-arc welding to thickness of slab, the welding conditions of taking are:
Under this welding conditions condition, the face of weld ripple moist (Fig. 2) that adopts the argon arc welding of nano-particle reinforcement activating gas tungsten to obtain; Increased 110%(Fig. 3-4 than the weld penetration that adopts argon tungsten-arc welding); The melting area of welding seam crystal grain is compared obviously with the argon arc welding of employing activating gas tungsten and is reduced (Fig. 5-6).The welding point tensile property of nano-particle reinforcement activating gas tungsten argon arc welding postwelding is than adopting the activating gas tungsten argon arc welding to improve 64.6%(Fig. 7).Solved the difficult problem of the shallow and activating gas tungsten argon arc welding coarse grains of magnesium alloy argon tungsten-arc welding fusion penetration.
Example 2
The weight proportion of oxide activating agent and nano-ceramic particle is TiO
2: 50% and nano SiC granule: 50%.First with TiO
2Activating agent powder and nano SiC granule particle mix in proportion, then add acetone in the mixture and make it become pasty state.With flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again, coating width is about 40 mm, and the average coating amount of activating agent is 5 mg cm
-2After the acetone volatilization, carry out Gas Tungsten Arc Welding.
Welding parameter is with example 1.
Example 3
The weight proportion of oxide activating agent and nano-ceramic particle is TiO
2: 70% and nano SiC granule: 30%.First with TiO
2Activating agent powder and nano SiC granule mix in proportion, then add acetone in the mixture and make it become pasty state.With flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again, coating width is about 40 mm, and the average coating amount of activating agent is 5 mg cm
-2After the acetone volatilization, carry out Gas Tungsten Arc Welding.
Welding parameter is with example 1.
Example 4
First with TiO
2The activating agent powder rear adding acetone of fully milling makes it become pasty state.With flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again, coating width is about 40 mm, and the average coating amount of activating agent is 5 mg cm
-2After the acetone volatilization, weld.
Welding parameter is with example 1.
Claims (2)
1. novel nano particle enhanced activity tungsten argon arc welding method, feature of the present invention is that activating agent is comprised of oxide activating agent powder and nano-ceramic particle, its weight proportion is TiO
2: 50%～70% and nano SiC: 30%～50%.
2. feature of the present invention is first the activating agent powder to be mixed according to right 1 described ratio, then adding acetone in the mixture makes it become pasty state, with flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again, coating width is about 40 mm, and the average coating amount of activating agent is 5 mg cm
-2, after the acetone volatilization, carry out Gas Tungsten Arc Welding.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900495A (en) * | 2017-11-27 | 2018-04-13 | 重庆大学 | A kind of novel active tungsten argon arc welding method for magnesium alloy |
| CN108032002A (en) * | 2017-11-27 | 2018-05-15 | 重庆大学 | A kind of mixed active agent for magnesium alloy activating-tungsten inert gas welding |
| CN108098115A (en) * | 2017-11-27 | 2018-06-01 | 重庆大学 | It is a kind of to connect method for the nanometer enhancing activating-tungsten inert gas welding of magnesium alloy |
| CN108115310A (en) * | 2017-11-27 | 2018-06-05 | 重庆大学 | A kind of nanometer enhancing activating agent connect for magnesium alloy activating-tungsten inert gas welding |
| CN109158736A (en) * | 2018-10-22 | 2019-01-08 | 山东省科学院新材料研究所 | A kind of method of carbon nanotube enhancing aluminum/magnesium alloy thick plate welded joint |
| CN112139636A (en) * | 2020-09-03 | 2020-12-29 | 南京理工大学 | Magnesium alloy activation TIG electric arc additive manufacturing system and method |
| CN113597358A (en) * | 2019-04-17 | 2021-11-02 | 安赛乐米塔尔公司 | Method for manufacturing an assembly by Submerged Arc Welding (SAW) |
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| CN102689111A (en) * | 2012-06-18 | 2012-09-26 | 重庆大学 | High-performance magnesium alloy welding active agent |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900495A (en) * | 2017-11-27 | 2018-04-13 | 重庆大学 | A kind of novel active tungsten argon arc welding method for magnesium alloy |
| CN108032002A (en) * | 2017-11-27 | 2018-05-15 | 重庆大学 | A kind of mixed active agent for magnesium alloy activating-tungsten inert gas welding |
| CN108098115A (en) * | 2017-11-27 | 2018-06-01 | 重庆大学 | It is a kind of to connect method for the nanometer enhancing activating-tungsten inert gas welding of magnesium alloy |
| CN108115310A (en) * | 2017-11-27 | 2018-06-05 | 重庆大学 | A kind of nanometer enhancing activating agent connect for magnesium alloy activating-tungsten inert gas welding |
| CN109158736A (en) * | 2018-10-22 | 2019-01-08 | 山东省科学院新材料研究所 | A kind of method of carbon nanotube enhancing aluminum/magnesium alloy thick plate welded joint |
| CN109158736B (en) * | 2018-10-22 | 2021-02-19 | 山东省科学院新材料研究所 | Method for reinforcing aluminum/magnesium alloy thick plate welding joint by carbon nano tube |
| CN113597358A (en) * | 2019-04-17 | 2021-11-02 | 安赛乐米塔尔公司 | Method for manufacturing an assembly by Submerged Arc Welding (SAW) |
| CN113597358B (en) * | 2019-04-17 | 2024-01-09 | 安赛乐米塔尔公司 | Method for manufacturing an assembly by Submerged Arc Welding (SAW) |
| CN112139636A (en) * | 2020-09-03 | 2020-12-29 | 南京理工大学 | Magnesium alloy activation TIG electric arc additive manufacturing system and method |
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Application publication date: 20130403 |