Aluminum alloy consumable electrode arc welding equipment and welding method

Abstract

The invention relates to an electrode arc welding gun, with the inner wall face of a nozzle of the welding gun being of a spiral flow guide structure, and aluminum alloy consumable electrode arc welding equipment using the welding gun. The equipment comprises a welding power source device, a wire feeding device, a gas flow device and a welding machine. When the equipment works, parameters of the welding equipment are initialized; a welding wire is ignited to form short-circuit transition molten drops, and a high-temperature melting area is formed at the to-be-welded workpiece; then heat in the welding area is controlled to reduce the input quantity according to the geometric grade, and therefore the temperature of the welded workpiece is reduced; the molten drops are separated from the welding wire at the moment and are attached to the high-temperature melting area, and short-circuit transition is completed; then, the molten drops impact a molten pool, and the welding drops impact and disperse to a high-temperature melting area; thus, the molten drops are dynamically and continuously formed and sent to the molten pool, a large number of alloy areas are formed in a welding area, and tightly-jointed weld joints are obtained. The equipment and the method improve fusion of the welding wire and wood.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy welding, in particular to an aluminum alloy metal arc welding equipment and welding method. Background technique [0002] Aluminum alloy is one of the most widely used metal materials in industry and civil use at present, because it has high physical properties, mechanical properties and process properties, especially low density. Under the circumstances, aluminum alloy, as the best lightweight alternative material, is widely used in aerospace, automobile manufacturing and high-speed trains and other fields. As a mass-produced industrial product appearance skin sheet material, due to the characteristics of aluminum alloy itself and the influence of welding heat factors, the thermal deformation of aluminum alloy sheet welding has become a technical bottleneck affecting welding quality. The oxide layer forms a barrier to the welding process and the fusion of the welding wire and the base met...

AI Technical Summary

Problems solved by technology

Specifically, a large amount of heat is produced in the arc welding process (Q=I2RT, the welding heat Q is equal to the product of the welding current I squared and the integrated resistance R in a certain time T); but due to the heat dissipation characteristics of aluminum alloys, the heating area is larger , faster cooling speed, more stress points and easy deformation, which make the welding seam forming error exceed the standard, the welding and base metal fusion are poor, the tensile strength is low, and the weld microstructure particles are relatively coarse

In addition, under the influence of high temperature welding heat and oxygen in air oxidation, the unwelded area is very easy to form an oxide layer with a very high melting degree Al 2 o 3 , affecting the fusion of the base metal and the weld pool

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