Electric-arc-assisted laser welding-brazing method applicable to dissimilar material butt connection

Abstract

Disclosed is an electric-arc-assisted laser welding-brazing method applicable to dissimilar material butt connection. The method is used for implementing high-quality connection between aluminum / steel dissimilar materials. The method comprises the steps that first, acetone is used for cleaning welded sheets to remove oil stains on the surfaces of the welded sheets, and oxide films on the surface of the aluminum or aluminum alloy sheet through a mechanical abrading method; second, the aluminum or aluminum alloy sheet and the steel sheet are fixed to a welding jig with a forming groove in a butt connection mode, and a connector is made to be located above the forming groove; third, acetone is added in a fluxing agent and evenly-mixed filling powder respectively, and the surface of an aluminum or aluminum alloy welding bead is coated with the mixture formed by the filling agent and acetone and the mixture formed by the filling powder and acetone in sequence after the mixtures are stirred; fourth, a laser beam and an assist electric arc behind the laser beam keep synchronous movement to carry out welding.

Description

technical field [0001] The invention relates to an arc-assisted laser melting and brazing technology for butt jointing of dissimilar materials, and belongs to the field of welding. Background technique [0002] With the development of the automotive industry, the demand for aluminum / steel integrated structures is increasing. The aluminum / steel integrated structure gives full play to their respective advantages, realizes structural lightweight, and has good economic benefits. It is crucial to promote the development of the national economy, especially the automobile industry. However, due to the large difference in physical or chemical properties between aluminum and steel, defects such as cracks and poor fusion are prone to occur during welding. Therefore, high-quality and efficient welding of aluminum / steel dissimilar metals is a technical problem in the field of material manufacturing. [0003] In recent years, many scholars at home and abroad have studied the laser weldi...

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Problems solved by technology

Some scholars used the method of adding metal powder to realize the laser brazing lap welding of aluminum / steel dissimilar metals. However, during laser brazing of aluminum / steel, the laser heat source is too concentrated, which restricts the infiltration and spreading of liquid metal, especially The problem is more prominent in aluminum / steel sheet butt welds, and it is difficult to obtain qualified joints

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