Method for optimizing aluminum/steel metal inert-gas (MIG) soldered joint through tungsten inert gas (TIG) voltaic arc cooperating with heating

Abstract

The invention provides a method for optimizing an aluminum / steel metal inert-gas (MIG) soldered joint through a tungsten inert gas (TIG) voltaic arc cooperating with heating. The method comprises the following steps: (1) laboratory equipment is prepared; (2) a TIG welding gun is mounted beside a MIG main welding gun and mutually parallel to the MIG main welding gun; (3) acetone is adopted to wipe greasy dirt impurities off in an aluminium plate, a steel plate beveled edge and the surrounding; (4) the TIG voltaic arc is confirmed to be located beside a steel side for assisting, namely, the TIG voltaic arc heats the steel additionally in the welding process; (5) official welding is carried out; (6) and after the welding is finished, the MIG main welding gun is firstly closed, and then the TIG welding gun is closed. The method for optimizing the aluminum / steel metal inert-gas (MIG) soldered joint through the tungsten inert gas (TIG) voltaic arc cooperating with heating has the advantages that conception is ingenious, heat balance when a single voltaic arc is welded can be changed, the temperature of solid-state steel substrates can be improved, changes of form of interface compounds is promoted, an interface intermetallic compound layer is changed from the fact that the interface intermetallic compound layer singly grows to welded joints so as to form a layer shape to the fact that the interface intermetallic compound layer grows to the steel side with a high melting point in a sawtooth shape, pinning effects are enhanced, and the mechanical property of a connector can be obviously improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for optimizing aluminum / steel MIG brazing joints through TIG electric arc cooperative heating. Background technique [0002] The aluminum / steel dissimilar metal structure can effectively take advantage of the advantages of the two materials. It has the characteristics of light specific gravity, high strength, and excellent corrosion resistance. It has more and more applications in aerospace, transportation and other sectors. Therefore, the aluminum-steel The welding between them has always been a research hotspot in the field of welding. At the same time, due to the huge difference between the two materials of aluminum alloy and stainless steel in terms of thermal physical properties and mechanical properties, brittle intermetallic compounds are easily formed during the reaction process, which reduces the mechanical properties of the joint. Therefore, it is also a diffi...

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Problems solved by technology

In the existing technology, the heating is only limited to the contact part between the aluminum plate and the steel plate, and the equilibrium state of the temperature field during the welding process has not changed, which leads to a large area of ​​the compound layer formed between the weld seam and the high melting point solid matrix and presents a uniform appearance. Layered, reliable connection can only be achieved by reducing the thickness of this layered compound or improving its distribution shape. In order to improve the mechanical properties of the joint and change the growth shape of the compound layer, a method of optimizing the joint by TIG arc heating is proposed. Method for Aluminum / Steel MIG Brazed Joints

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