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Three-dimensional distribution two-arc welding method

A welding method and dual-arc technology, applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of the limited ability to increase the penetration depth of dual-arc heat source welding and the lack of substantial increase in the energy density of the welding heat source.

Active Publication Date: 2015-01-28
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current double-arc welding method adopts the arrangement of two arcs in the same plane in series or in parallel in the welding direction. To improve the welding melting efficiency, the energy density of the welding heat source has not been substantially improved, so the existing double arc heat source is still limited in its ability to increase the welding penetration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: Using argon tungsten arc as the front arc, implement 8mm thick AZ31B magnesium alloy plate butt welding.

[0019] Assemble the welding torch as shown in Figure 1. The diameter of the front tungsten electrode is 3.2mm, the height from the tip to the surface of the magnesium alloy plate is 1.5mm, α=30°, and the Ar gas flow rate with a purity of 99.99% is 10L / min. The rear tungsten pole is perpendicular to the magnesium alloy plate β=0°, with a diameter of 1.6mm and d=4mm. γ=0°, ε=0°. The casing is made of tungsten metal, Φ 1 =3mm, Φ 2 =5mm, d e =0.5mm, where the Ar gas flow rate is 1L / min. The welding speed is 550mm / min. At the same time, the front tungsten electrode starts arcing, and the welding current adopts DC 140A. After the front arc is stable, the rear tungsten electrode shielding gas is turned on, and the rear tungsten electrode starts arcing at the same time. h 1 =3.5mm.

[0020] This method is used to weld 8mm thick magnesium alloy plates w...

Embodiment 2

[0021] Embodiment 2: This welding method is used to implement butt welding of 6061 aluminum alloy plates with a thickness of 10 mm.

[0022] Assemble the welding torch as shown in Figure 1. The diameter of the front tungsten electrode is 3.2mm, the height between the tip and the surface of the plate is 1.5mm, α=45°, and the flow rate of Ar gas with a purity of 99.99% is 10L / min. The rear tungsten electrode is perpendicular to the surface of the plate, with a diameter of 2.0mm, and the horizontal distance between the tips of the two electrodes is d=4mm. The angle between the two welding torches perpendicular to the welding direction is γ=0°, β=-10°, ε=0°. The casing material is made of tungsten metal, the outer diameter is Φ 2 =5mm, inner diameter Φ 1 =4mm, rear tungsten pole extension d e=0mm, where the Ar gas flow rate is 2.5L / min. The welding speed is 350mm / min, the front tungsten arc is started, the welding current is DC 180A, after the front arc is stable, the rear tun...

Embodiment 3

[0024] Embodiment 3: Butt welding of 18 mm thick Q235 steel plate is carried out by adopting melting electrode arc as the front arc.

[0025] Assemble the welding torch as shown in Figure 1, the front arc height is 4mm, α=45°. The rear tungsten pole is perpendicular to the surface of the plate, with a diameter of 4mm. The angle between the two welding torches perpendicular to the welding direction is γ=0°, β=-10°, ε=-10°. The casing material is made of tungsten metal, Φ 2 =8mm, Φ 1 =6.0mm, rear tungsten pole extension d e =-5mm, the flow rate of Ar in the tungsten tube is 15L / min. The distance between the two electrode tips before welding is d=7.5mm. The welding speed is 200mm / min, the front torch starts the arc first, and the welding current adopts DC 480A. After the front arc is stable, the rear tungsten electrode shielding gas is turned on, and the rear tungsten electrode starts arc at the same time. The welding current is DC 290A, and the rear tungsten electrode has a...

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Abstract

The invention discloses a three-dimensional distribution two-arc welding method. The three-dimensional distribution two-arc welding method is characterized in that two arc heat sources are adopted, two arcs are respectively produced by an electrode of a front welding gun, an electrode of a rear welding gun and a workpiece, the two electrodes are in front-back series connection in the welding direction, a front arc is produced by the electrode I of the front welding gun and used for melting the metal of the workpiece so as to form a welding pool, the electrode II of the rear welding gun is concentrically mounted in a sleeve made from a high temperature resistant material, the other end of the sleeve is connected with the welding gun and is charged with high-speed flowing protective gas, the protective gas outflows from the pointed end of the electrode II of the rear welding gun along a gap between the sleeve and the electrode II of the rear welding gun, a hole is formed in the liquid welding pool due to the pressure of the protective gas, a rear arc formed after the electrode II of the rear welding gun strikes an arc submerges to the bottom of the front arc through the hole, a three-dimensional coupled arc is formed by the two arcs and carries out welding through moving along the welding direction. According to the method, the coupled arc with high energy density is formed, so that the weld penetration is remarkably increased, and the welding requirements of medium-thickness plate materials are met.

Description

technical field [0001] The invention relates to a three-dimensional distributed double arc welding method. Background technique [0002] With the increase of the thickness of the welding plate and the continuous improvement of the welding efficiency requirements, people have successively developed double-arc or even multi-arc welding technologies. Using this method, double-wire or even multi-wire welding can be realized and the welding heat input can be improved significantly. Improve welding melting efficiency, thereby improving welding production efficiency. For example, Praxair Technology Co., Ltd. of the United States proposed a new type of double-wire MIGA welding torch with adjustable wire spacing and its welding method (CN200810190700.6); mentioned in the patent of Inner Mongolia North Heavy Industry Group Co., Ltd. A method for robotic twin-wire welding of aluminum alloy materials (CN200910168787.1); Harbin Institute of Technology has developed a TIG power-assisted ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167
Inventor 刘黎明张兆栋宋刚王红阳任大鑫
Owner DALIAN UNIV OF TECH