JP3294080B2 - Consumable electrode gas shielded arc welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a consumable electrode gas shielded arc welding apparatus .

[0002]

2. Description of the Related Art Conventionally, in performing welding by consumable electrode gas shielded arc welding, as shown in a schematic diagram of FIG. 5, a welding power source 2 is connected to a workpiece 1 and a welding torch 3 is welded. to face the wood 1, so the arc 6 is generated between the tip and the material to be welded 1 of the wire 5 is protruded wire 5 of the consumable electrode type from the tip 4 at the tip, further, the welding vehicle or robot A feed motor 10 is fed from a wire reel 9 through a conduit cable 8 connected to the base end of the welding torch 3 fixed to the support arm 7.
The wire 5 is fed by a driven feed roller 11.

With such an apparatus configuration, when a shield gas is supplied from a shield gas supply pipe ( not shown) to the periphery of the chip 4 and a voltage is applied from the welding power source 2 to the workpiece 1 and the chip 4, the wire is An arc 6 is generated at the tip of 5 , and the tip of the wire 5 is melted to form a droplet. The amount by the feed roller 1 this time the droplet is moved to the side of the workpieces 1
By rotating 1 and feeding the wire 5 at a constant speed,
Arc 6 can be generated between the tip and the material to be welded first stable wire 5, the welding current and from 200 to 300 amps for example using solid wire of wire diameter 1.2 mm, the shield gas in case of supplying the carbon gas 25 l / min to the wire feed speed is, 30 to 40 m
/ Min. On the other hand, the situation where the droplet formed at the tip of the wire 5 shifts to the material 1 to be welded is as shown in the explanatory view of FIG. 6, that is, in FIG.
6 (b) and 6 (c) and droplet 23
Grows. At this time, if the shielding gas is carbon dioxide gas, the arc 6 is generated between the surface of the material 1 to be welded and the bottom of the droplet 23. can not be pushed up by transition easily to the side of the material to be welded 1, becomes a state as shown in FIG. 6 (c) until the weight of droplet 23 overcomes the arc force, when moving in Fig. 6 (d) Means that large droplets 23 fly. And such flight of the large droplet 23 becomes sputtering Heading location other than the weld pool of the weld material 1, the surface of the workpieces 1 spatter it also becomes possible to sputter the large adheres, as a result Not only the spatter removal operation takes time, but also the welding efficiency from the wire 5 is reduced, the consumption of the wire 5 is increased, and the welding efficiency is also reduced.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above circumstances, and enables welding with less spatter, reduces the consumption of wire, has an economic merit, and has an operation for removing spatter . Electrode gas shielded arc melting which reduces
An object of the present invention is to provide a SeSSo location.

[0005]

SUMMARY OF THE INVENTION Therefore, the wear of the present invention is reduced.
An electrode gas shielded arc welding apparatus includes: a wire supply nozzle attached to a tip of a torch base via a flexible member; a pair of magnetic cores disposed on opposite side surfaces of the wire supply nozzle; A pair of electromagnetic coils respectively disposed around the coil, a voltage generator for alternately applying a DC voltage to the pair of electromagnetic coils, and a timing circuit for transmitting the voltage application timing of the voltage generator to a welding power source. The magnetic coil generates a magnetic field and applies an attractive force to the magnetic iron core, thereby oscillating the wire supply nozzle to perform high-speed pulsed wire feeding and high-speed pulsed wire feeding. The feature is that the welding current is changed according to the timing of
You.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the consumable electrode gas shielded arc soluble SeSSo location of the present invention will be described. Drawings,
FIG. 1 is a schematic view of a welding apparatus according to the present invention , FIG. 2 is a longitudinal sectional view of the welding torch in the above, and FIG. 3 shows the outline of pulsed high-speed wire feeding in the welding apparatus of the present invention . Explanation diagram, FIG.
FIG. 4 is an explanatory view showing a state of transfer of droplets in the welding device of the present invention . First, in FIGS. 1 and 2, reference numerals I to II indicate the same members as in FIG. 5, and a shielding gas injection hole 14 for discharging carbon dioxide gas sent from a shielding gas supply pipe 13 is provided in a torch base 12 of the welding torch 3. there are bored, to the tip of the torch base 12, with the wire feed nozzle 16 via a spring 15 is mounted, the chip fixture 17 by presence of the slight gap in the above is disposed, there The wire 5 protrudes from the tip of the fixed chip 4.

A pair of magnetic iron cores 18A and 18B are fixed to the opposite side surfaces of the wire supply nozzle 16, respectively, and a pair of electromagnetic coils 19A and 19B are provided around the pair of magnetic iron cores 18A and 18B. Are arranged respectively. The pair of electromagnetic coils 19A, 19B
Are connected to DC voltage generators 20A and 20B, respectively, and both DC voltage generators 20A and 20B are connected to a voltage generation regulator 21 for adjusting the operation timing of the two. A timing circuit 22 for adjusting the generation timing of the pulse welding current in accordance with the pulsed high-speed feeding of the wire 5 is connected, and its output terminal is connected to the welding power source 2.

With reference to FIGS. 3 and 4, a description will be given of a procedure for welding by superposing a pulse welding current on the pulsed high-speed feeding of the wire 5 by such an apparatus configuration.
, DC voltages of, for example, 0V and 24V pulse patterns are applied from the DC voltage generators 20A and 20B to the electromagnetic coils 19A and 19B at the cycle of the voltage waveform patterns A and B adjusted by the voltage generation regulator 21. By applying the DC voltage, an electromagnetic force acts on the electromagnetic coils 19A and 19B, and an attractive force acts on the magnetic cores 18A and 18B on the side of the coil where the electromagnetic force is generated. Then, due to the action of the attractive force, the wire supply nozzle 16 swings around the spring 15 toward the coil where the electromagnetic force is acting, and as a result, the wire 5 at the tip of the welding torch 3 shows a phenomenon of popping out instantly. .

That is, when 24 V of the voltage waveform pattern A is applied to the electromagnetic coil 19A, as shown in FIG. 3A, an attractive force is generated in the magnetic iron core 18A, and the wire supply nozzle 16 is connected to the electromagnetic coil 19A. The wire 5 is swung to the side, and the wire 5 is
7 is bent. Next, from this state, the applied voltage of the electromagnetic coil 19A becomes 0V, and at the same time, when 24V of the voltage waveform pattern B is applied to the electromagnetic coil 19B, as shown in FIG. 3B, the attractive force is applied to the magnetic core 18B. Is generated and the wire supply nozzle 16 is
Rocked toward B. At this time, 3 wire 5 which has been bent at (A) becomes a straight between the wire supply nozzle 16 and the tip fixture 17 as shown in FIG. 3 (C), the was bent in the former state The feed speed is momentarily high so that the wire 5 jumps out of the chip 4 by the amount of l (ell), and when the state shown in FIG.
To withdraw from Therefore, by periodically repeating such a swinging operation of the wire feeding nozzle 16, the wire 5 is fed at a high speed in a pulsed manner.

Next, referring to FIG. 4, a description will be given of a situation in which a pulse welding current is superimposed in accordance with the cycle of the pulsed high-speed feeding of the wire 5 to cause the droplet to shift to a short circuit. The waveform pattern v in FIG. The pulse-shaped wire feeding speed is shown, and waveform patterns A and B show the same applied voltage as in FIG.
The waveform pattern I shows a pulsed welding current, and changes the welding current from the peak current to the base current immediately before the wire feed is performed at a high speed, and further immediately after the wire feed is performed at a high speed. The welding current is changed from the base current to the peak current, and in this case, the arc current is gradually increased in order to suppress the sudden occurrence of the arc 6. The welding current repeats the cycle T of the waveform pattern I, and the timing control of the welding current is performed by controlling the welding power supply 2 by the timing circuit 22.

[0011] By such a pulse-like high-speed feeding of the wire 5 and the superposition of the pulse welding current, in FIG.
The droplet 23 grows large due to the high welding current, and then the welding current changes to the base current, so that the force of the arc 6 also weakens. Then, in FIG. Short-circuited smoothly to the workpiece 1 without being affected by the arc force, and reliable welding is performed as shown in FIG. Further, in FIG. 4D, the wire feeding speed becomes constant, the welding current gradually shifts to the peak current, and the droplet 23 grows again and becomes large. In FIG. ) Will be repeated. Thus, by superimposing the pulsed high-speed feeding of the wire 5 and the pulse welding current, the transfer of the droplets 23 that cause spatter can be regularly and reliably transferred to the workpiece 1, and the spatter is less generated. Gas shielded arc welding can be performed.

An embodiment will be described below.
Using a 2 mm solid wire, supplying 25 l / min of carbon dioxide gas as the shielding gas, and the distance between the workpiece and the tip;
20 mm, welding speed: 30 cm / min, wire feeding speed: 30-40 m / min, pulse wire feeding cycle: 50-60 Hz, peak welding current: 500 amps, base welding current: 50 amps ,
Good welding without spatter was performed.

[0013]

In summary, the consumable electrode gas shield of the present invention.
According to the arc welding apparatus , a wire supply nozzle attached to the tip of the torch base via a flexible member, and a pair of magnetic cores disposed on opposite side surfaces of the wire supply nozzle,
A pair of electromagnetic coils respectively arranged around the magnetic core, a voltage generator for alternately applying a DC voltage to the pair of electromagnetic coils, and a voltage application timing of the voltage generator to a welding power source. And a timing circuit for transmitting the magnetic field, causing the electromagnetic coil to generate a magnetic field and exerting an attractive force on the magnetic iron core to oscillate the wire supply nozzle to perform high-speed pulse-like wire supply, and to perform pulse pulsing of the wire. by you to change the welding current in accordance with the manner fast feed timing, sputter less welding becomes possible, together with the exhaustion of the wire decreases there is economic merit, sputter removal operation is reduced, it is thus welding efficiency The present invention is extremely industrially beneficial because it provides an improved consumable electrode gas shielded arc welding apparatus.

[Brief description of the drawings]

1 is a schematic diagram of the present invention a consumable electrode gas shielded arc soluble SeSSo location.

FIG. 2 is a longitudinal sectional view of the welding torch in the above.

FIG. 3 is an explanatory view showing the outline of pulsed high-speed wire feeding in the consumable electrode gas shielded arc welding apparatus of the present invention .

FIG. 4 is an explanatory view showing a transfer state of droplets in the consumable electrode gas shielded arc welding apparatus of the present invention .

FIG. 5 is a schematic view showing a conventional welding device .

FIG. 6 is an explanatory view showing a state of transfer of droplets in the above.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 welding material 2 welding power source 3 welding torch 4 tip 5 wire 6 arc 7 support arm 8 conduit cable 9 wire reel 10 feed motor 11 feed roller 12 torch base 13 shield gas supply pipe 14 shield gas injection hole 15 spring 16 wire Supply nozzle 17 Tip fixture 18A, 18B Magnetic iron core 19A, 19B Electromagnetic coil 20A, 20B DC voltage generator 21 Voltage generation regulator 22 Timing circuit 23 Droplet

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23K 9/073 B23K 9/08 B23K 9/09 B23K 9/12 B23K 9/173

Claims (1)

(57) [Claims] 1. Attached to the tip of a torch base via a flexible member
And the wire supply nozzle
A pair of magnetic cores disposed on opposite sides, and the magnetic core
A pair of electromagnetic coils respectively arranged around the iron core,
A voltage that applies a DC voltage alternately to the pair of electromagnetic coils.
Weld the generator and the voltage application timing of the above voltage generator
A timing circuit for transmitting power to the power supply.
To generate a magnetic field on the magnetic core and apply an attractive force to the magnetic core
This causes the wire supply nozzle to swing,
Performs pulsed high-speed feeding and pulsed wires
The welding current in accordance with the timing of high-speed feeding
Consumable electrode gas shield arc, characterized in that
Welding equipment.