Aluminum and aluminum alloy double-gun double-face collaborative welding method

Abstract

The embodiment of the invention provides an aluminum and aluminum alloy double-gun double-face collaborative welding method. The aluminum and aluminum alloy double-gun double-face collaborative welding method comprises the steps that two welding guns are arranged on the front face and the back face of a welding joint correspondingly with a preset distance in the weld direction of the welding joint; and the two welding guns both operate in a metal inert-gas (MIG) welding mode, strike arcs successively and move synchronously and collaboratively to conduct welding. According to the aluminum and aluminum alloy double-gun double-face collaborative welding method, full penetration of a root of aluminum and aluminum alloy under the zero clearance condition is achieved, the welding joint with the large thickness can be welded through MIG welding, the quality of the welding joint of the aluminum and aluminum alloy is improved, and the service life of a weldment is prolonged.

Description

technical field [0001] The embodiment of the present invention relates to the field of welding technology, in particular to a double-gun double-sided cooperative welding method for aluminum and aluminum alloy. Background technique [0002] The use of aluminum alloy and aluminum and its welded structure is one of the effective ways to reduce the overall structural weight of equipment and improve energy efficiency, and is widely used in the manufacture of key load-bearing components of welded structures such as aerospace and high-speed trains. Aluminum alloy has the characteristics of low density, high specific strength, non-magnetism, good corrosion resistance, low temperature toughness and formability, and has been widely used in rail vehicles, aerospace and other industries, and has become an ideal lightweight material. The physical and chemical properties of aluminum alloy itself, low melting point, fast heat dissipation, fast solidification, and large linear expansion coe...

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Problems solved by technology

[0003] The welding of aluminum alloy and aluminum faces many problems, and welding defects such as poor fusion, pores, and cracks are prone to occur. The main reasons for these welding defects are: (1) aluminum alloy has good thermal conductivity, and its thermal conductivity is several times that of iron. Second only to gold, silver, and copper

(2) Aluminum is easily oxidized in the air and during welding, and the resulting alumina (Al 2 o 3 ) has a high melting point, is very stable, is not easy to remove, and is prone to defects such as slag inclusion, incomplete fusion, and incomplete penetration; the oxide film on the surface of aluminum alloy will absorb a large amount of water, and it is easy to cause pores in the weld

(4) Defects caused by incorrect operation methods during the welding process, such as incomplete fusion, cracks, pores, etc.

In the prior art, in order to ensure full penetration, large gaps are used for welding or welding is carried out after back cleaning. However, large gaps increase the filling amount of welding wire metal, resulting in large heat input of the base metal, large welding deformation, and poor mechanical properties. decline, and dorsal rooting reduces survival efficiency

In the prior art, TIG eutectic pool welding is also used to improve the quality of welded joints. However, this welding method can only weld weldments with small thickness, and the welding process is complicated and difficult to operate. The welding position of the welding torch is relatively small. vulnerable to limitations

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