Additional electric arc heating copper backing board pre-heating aluminum alloy and magnesium alloy welding method

Abstract

The invention relates to a welding method, in particular to a welding method in which an electric arc is added to heat a copper padding plate and preheat aluminum alloy and magnesium alloy, aiming to reduce defects of blowholes and cracks at the joint, ensure good forming at the back of the joint, and finally obtain high quality joint which is suitable for aluminum alloy and magnesium alloy. In order to solve the problems that the aluminum alloy and magnesium alloy are liable to generate blowholes and cracks during welding and the forming at the back of the joint is poor, the invention provides the welding method in which the electric arc is added to heat the copper padding plate and preheat aluminum alloy and magnesium alloy. The copper padding plate is adopted when the butt joint is welded using aluminum alloy and magnesium alloy, and the electric arc is added at the back of the copper padding plate. The shape of the copper padding plate varies with the weldment. The method has the advantages of simple and easy practice, convenient operation, and obvious effect for improving the forming at the back of the joint and the quality of the joint.

Description

technical field [0001] The invention relates to a welding method, specifically a welding method for preheating an aluminum alloy and a magnesium alloy by heating a copper backing plate with an additional electric arc, and belongs to the field of electric arc welding. Background technique [0002] Aluminum and aluminum alloys are widely used in industry due to their high specific strength and good corrosion resistance. The specific gravity of magnesium is 2 / 3 of that of aluminum. It is a metal with good specific strength. In industry, aluminum, zinc and other components are often added to magnesium alloy to improve its performance. In recent years, with the rapid development of science and technology and industrial economy, especially the vigorous development of the aerospace industry and the automotive industry, the demand for high-quality aluminum alloy and magnesium alloy welded components is increasing. The welding of aluminum alloy and magnesium alloy mainly exists Two ...

AI Technical Summary

Problems solved by technology

[0006] The present invention is to solve the problem that air holes and cracks are easily produced in the welding process of aluminum alloy and magnesium alloy, and the problem of bad shape on the back of the joint is proposed.

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