Method for performing laser welding by filling powder between aluminum sheet and steel sheet

Abstract

The invention discloses a method for performing laser welding by filling powder between an aluminum sheet and a steel sheet and belongs to the technical field of laser welding. Electric arc energy in the prior art is difficult to control, if too much heat is input into one side of aluminum, the temperature is too high, and the temper brittleness phenomenon is generated and intensity of a welding joint is reduced. Moreover, the phenomenon of welding wire blocking is generated during welding. The technical problems are more serious for sheets with thickness of less than 4mm. A welding workpiece is an aluminum panel and a steel panel which are butted on the same plane with gaps; beveled edges are formed at seams; Al-Si solder is adopted, alloying elements Cu, Mn, and Zn are added, and the aluminum panel and the steel panel are respectively the aluminum sheet and the steel sheet of which the thicknesses are both 1 to 4mm; and the Al-Si solder is made into powder, powdery Al-Si solder is added into a groove formed by clamping the beveled edges of the aluminum sheet and the steel sheet respectively, and the aluminum sheet and the steel sheet travel together and welding is performed by taking laser as a welding heat source.

Description

Powder-filled laser welding method between aluminum sheet and steel sheet technical field The invention relates to a powder-filled laser welding method between an aluminum thin plate and a steel thin plate to realize good welding of two thin metal workpieces, and belongs to the technical field of laser welding. Background technique Dissimilar metal structures such as aluminum-steel structures are obtained by welding. However, due to the large differences in physical properties such as thermal expansion coefficient, thermal conductivity, specific heat, and melting point between dissimilar metals, and because dissimilar metals are easily reacted to form brittle intermetallic compounds, or there are brittle phases in welded joints, resulting in welded joints The mechanical properties deteriorated severely. Especially in the welding of aluminum and steel, the solid solubility between the main alloying elements is very low, and the thermophysical properties are very different....

AI Technical Summary

Problems solved by technology

Although this method solves the problem of generating brittle intermetallic compounds during the welding process of dissimilar metals, it is difficult to control the energy of the arc. If too much heat is input to one side of the aluminum material, the temperature will be too high, resulting in temper brittleness. Reduced strength of welded joints

In addition, during the welding process, the phenomenon of welding wire plugging will also occur.

The above technical problem will be more serious for thin plates with a thickness less than 4mm, because it is more difficult to apply heat between the thin plates, and the thinner the solder, the easier it is to block the wire

Images