Laser-double tig arc composite self-fusion brazing method of aluminum alloy and stainless steel

Abstract

A laser-double TIG arc composite self-melting brazing method for aluminum alloy and stainless steel, including using laser beam-double TIG arc composite heat source to weld the lap joint where the aluminum alloy plate is on the top and the stainless steel is on the bottom, and the composite heat source melts the aluminum alloy , heating the stainless steel to form a brazing interface. The laser beam is a scanning laser beam with variable power pulse; the double TIG electric arc includes a positive polarity TIG electric arc and a reverse polarity TIG electric arc; side; during the welding process, the laser beam scans the surface of the workpiece to be welded, and ensures that 2 / 3-3 / 4 of the laser heat is on the aluminum alloy plate, 1 / 3-1 / 4 of the laser heat is on the stainless steel plate, and the DC is reversed to TIG The welding torch and DC positive TIG welding torch alternately start the arc, the reverse polarity TIG arc and high-power laser pulse form a composite heat source, and the positive polarity TIG arc and low-power laser pulse form a composite heat source. The welding method of the invention can obtain self-fluxing brazing joints with excellent mechanical properties.

Description

technical field [0001] The invention provides a laser-double TIG arc composite self-fluxing brazing method for aluminum alloy and stainless steel, which belongs to the field of welding processing. Background technique [0002] Aluminum alloy is light in weight, has good thermal conductivity and good corrosion resistance, while steel, as the main traditional material in the manufacturing industry, has high strength, good toughness and plasticity, and wide applicability. The aluminum alloy / steel composite structure can not only give full play to the advantages of both, but also reduce the overall weight of the manufactured product under the premise of ensuring performance. Therefore, it has broad application prospects in major national economic fields such as aerospace, mechanical equipment, and rail transportation. However, welding between aluminum and stainless steel has always been a hot and difficult issue in the field of connection. The main difficulties are: first, inte...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a laser-double TIG arc composite self-fluxing brazing method for aluminum alloy and stainless steel, which is carried out in the alternate manner of reverse polarity TIG arc-laser composite heat source and positive polarity TIG arc-laser composite heat source Welding, and the interface is regulated by scanning the laser beam, which solves the problem of uneven interface layer, and can obtain a welded joint with excellent performance and uniform interface layer

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