Laser offset welding method suitable for magnesium/steel and magnesium/titanium

Abstract

The invention relates to a welding method for dissimilar metals, and in particular relates to a laser offset welding method suitable for magnesium / steel and magnesium / titanium. The method comprises the following steps: (1) fixing to-be-welded magnesium and steel or magnesium and titanium on a work table, and jointing by use of zero-gap seamless joints; and (2) achieving the welding by irradiating steel or titanium with laser under the conditions of filling welding wire or not, wherein the protection gas flow rate is1 L / min to 50 L / min, the welding speed is 0.1 m / min to 1 m / min, the laser power is 1 W to 10 kW, and the laser offset 0.1 mm to 0.8 mm. The high-melting-point side material can be molten by irradiating with the laser beam, and the low-melting-point side material can be molten through heat conduction so as to achieve the connection between the two kinds of materials. When a laser beam directly irradiates a high-reflectivity material, such as a magnesium alloy, the material has low energy absorption rate. However, the laser offset welding method can solve the problem, and can reduce the defects, such as welding seams and pores, generated on the material with a low melting point or a low bolting point.

Description

Laser offset welding method for magnesium / steel, magnesium / titanium technical field The invention relates to a welding method between dissimilar metals, in particular to a fusion welding method of magnesium / steel and magnesium / titanium, and belongs to the field of welding. Background technique With the increasingly severe environmental problems, it is imperative to save energy, reduce emissions and promote "low-carbon" life. Therefore, light metals such as magnesium alloys and aluminum alloys are widely used in aviation, electronics, transportation and other fields to successfully replace traditional structural materials and reduce the weight of the structure itself, which has become the focus of research. In the automobile industry, composite structural parts are mainly dissimilar joints formed by light metals such as magnesium and aluminum and steel and titanium. In particular, there are many spliced ​​plates and unequal thick plates of this dissimilar material. Due to ...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to provide a laser offset welding method suitable for magnesium / steel and magnesium / titanium in view of the problems that air holes are likely to be generated during welding of low-melting point materials and poor mechanical properties of joints when welding dissimilar materials.

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