Alternating-current double-pulse MIG (Metal-Inert Gas) welding method for dissimilar metal welding of iron and aluminium

A technology of dissimilar metals and welding methods, applied in the field of arc welding metals, can solve the problems of joint size and shape limitation, large heat input, affecting the mechanical properties of joints, etc., to reduce the number of pores, improve mechanical properties, and reduce thickness. Effect

Inactive Publication Date: 2012-08-08
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The mechanical properties of the joint obtained by friction welding are better, but the size and shape of the joint will be limited
Laser welding and arc welding have a wide range of applications, but the heat i

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  • Alternating-current double-pulse MIG (Metal-Inert Gas) welding method for dissimilar metal welding of iron and aluminium
  • Alternating-current double-pulse MIG (Metal-Inert Gas) welding method for dissimilar metal welding of iron and aluminium
  • Alternating-current double-pulse MIG (Metal-Inert Gas) welding method for dissimilar metal welding of iron and aluminium

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0022] Please see first figure 1 , figure 1 It is a schematic diagram of AC double-pulse MIG welding for welding iron and aluminum dissimilar metals. As shown in the figure, an AC double-pulse MIG welding method for welding iron and aluminum dissimilar metals includes: metal iron plate 1 during welding Fix it on the workbench; the metal aluminum plate 2 is placed at 10mm-20mm on the iron plate 1 in an overlapping manner, and fixed with a clamp; align the AC double-pulse MIG welding torch 3 at the edge of the metal aluminum plate 2, and the workbench is 500mm / Move at a speed of min.

[0023] Before welding starts, adjust the current output mode to AC double pulse mode, and set the welding current, welding voltage, shielding gas flow, table movement speed and low-frequenc...

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Abstract

The invention discloses a novel alternating-current double-pulse MIG (Metal-Inert Gas) welding method for dissimilar metals of iron and aluminium. The alternating-current MIG welding enables a base metal to be in a state with continuous change between a positive electrode and a negative electrode by power control, so that the heat input of the base metal in the welding process can be reduced, the thickness of fragile compounds between the metals of iron and aluminium can be reduced, and the mechanical property of welding joints is improved. Simultaneously, the alternating-current double-pulse MIG welding applies two types of pulses with different frequencies (one is high and the other is low) to current in the welding process; and due to the oscillation action of the double-pulse mode on a molten pool, the quantity of gas holes in an aluminium welding seam is reduced; and fish scales are formed on the surface of the welding seam, and the mechanical property of the dissimilar metal joints of iron and aluminium is effectively improved.

Description

technical field [0001] The invention relates to the field of arc welding metals, in particular to an AC double-pulse MIG welding method for welding iron and aluminum dissimilar metals. Background technique [0002] The current rapid development of the transportation industry has brought great convenience to people's lives. But at the same time, the large-scale use of aircraft and automobiles has led to the use of a large amount of fossil fuels, which has aggravated the pollution of the environment. Therefore, in order to achieve the goal of sustainable development, choosing light metals instead of heavy metals and reducing the weight of the vehicle as much as possible on the premise of ensuring mechanical properties can effectively improve the efficiency of fossil fuel use and reduce greenhouse gas emissions. Due to its excellent mechanical properties, aluminum alloy can partially replace steel as a frame structure, so welding aluminum alloy and steel can obtain good compre...

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Application Information

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IPC IPC(8): B23K9/173B23K9/23B23K9/09B23K103/20
Inventor 华学明苏永超吴毅雄李芳
Owner SHANGHAI JIAO TONG UNIV
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