Method for directly welding aluminum and non-coating steel

Abstract

The invention relates to a method for directly welding aluminum and non-coating steel, belonging to the technical fields of material processing and manufacturing engineering. The method is characterized in that when heterogeneous metals which are the aluminum and the steel are welded, the surface of the steel is not needed to be plated with intermediate layer metal or coated with soldering flux in advance; tungsten electrode gas shielded welding or melting electrode gas shielded welding technique is adopted, and a welding wire obtained by the technique is a flux-cored wire which is filled with soldering flux inside zinc base alloy material; the welding wire contains the aluminum with the mass percent of 0.1-30%; the filled soldering flux is cesium aluminum tetrafluoride with the mass percent of 10-20%; and the method can realize direct welding between the aluminum as well as aluminium alloy and the non-coating steel. The method has the advantages that a manufactured aluminum-steel heterogeneous metal joint has the tensile strength which is more than 80% of the tensile strength of aluminium alloy parent metal; and the method has simple technique, saves the energy consumption, reduces the manufacturing process and the cost, and is widely applied to welding between heterogeneous metal products, namely, between aluminum as well as aluminium alloy and iron-based materials such as the non-coating steel, cast iron and the like.

Description

technical field [0001] The invention belongs to the technical field of material processing and manufacturing engineering, and relates to the welding technology of dissimilar materials between aluminum and non-coated steel, in particular to the flux-cored wire gas shielded welding of aluminum and non-coated steel. Background technique [0002] At present, explosive welding, friction welding, brazing and other methods are widely used in the direct welding technology of aluminum and steel. Alternatively, a transition layer metal such as zinc or aluminum is first coated on the steel surface, and then the aluminum and the coated steel are welded. Explosion welding and friction welding have special requirements on the type of welded joints, and can only weld workpieces of a certain shape [Documents 1-2]. When aluminum and steel are brazed, generally a layer of flux is applied on the surface of the steel first, and then the solder is used for furnace brazing or arc melting brazing...

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Problems solved by technology

[0015] According to the above literature search, no public technology and literature data of welding aluminum and steel using the method described in this patent application have been found.