Method for regulating laser penetration weld intermediate layer of layered bimetal composite material

Abstract

The invention discloses a method for regulating a laser penetration weld intermediate layer of a layered bimetal composite material. A constant magnetic field is applied to a welding path of the bimetal composite material, then a laser welding technology is adopted under the constant magnetic field for conducting penetration welding on a to-be-welded workpiece, and penetration welding is achieved.By means of the method, laser welding is conducted under the constant magnetic field, in the laser welding process, Marangoni convection with the horizontal speed component as the leading part happens to the upper portion and the lower portion of a molten pool, liquid metal flows in the magnetic field and generates induction currents perpendicular to the direction of the magnetic field and the movement direction, the induction currents interact with the magnetic field, lorentz force with the direction opposite to the flowing direction of the liquid metal is generated, the flowing speed of theliquid metal is reduced, the Marangoni convection having the leading effect in the molten pool flowing behavior is inhibited, convection exchange between a base layer and a multiple layer of the composite material is reduced, the thickness of the intermediate layer is reduced, the performance of the weld multiple layer is finally improved, and the welding quality is improved.

Description

technical field [0001] The invention belongs to the technical field of welding, and in particular relates to a method for regulating the laser penetration of a layered bimetal composite material into a middle layer of a weld. Background technique [0002] Layered bimetallic composite material is a kind of material obtained by combining two metal materials with large differences in strength, melting point and expansion coefficient through explosive welding, rolling and other processes to achieve mechanical or metallurgical bonding strength. composite material. The layered bimetallic composite material gives full play to the different characteristics of different materials of the base layer and the cladding layer, and is widely used in many fields. For example, bimetallic plate-like composite materials and tubular composite materials with low-cost carbon steel as the base layer and stainless steel with good corrosion resistance as the cladding have been widely used in petroch...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for controlling the middle layer of laser penetration welding seam of composite materials, so as to solve the problem of performance degradation of multi-layer joints caused by the middle layer of multi-layer joint welding seam of layered bimetallic composite materials by laser penetration welding

Images