Double-beam laser deep penetration brazing method applicable to moderately thick plate aluminum/steel dissimilar alloy connection

Abstract

The invention provides a double-beam laser deep penetration brazing method applicable to moderately thick plate aluminum / steel dissimilar alloy connection, and belongs to the field of laser machining of dissimilar alloy connection. According to the double-beam laser deep penetration brazing method, two laser beams with different forms of energy are arranged in series, and act on the steel side; through the main laser beam, deep penetration is achieved on the steel side; a solid-state steel intermediate layer is acquired by controlling the offset dp of the laser beams with a steel / aluminum interface and the heat input on a regulating joint interface, the heat input for welding is transferred through the solid-state steel intermediate layer, an aluminum alloy is molten, and the molten aluminum alloy is wetted and spread, thereby achieving laser deep penetration brazing of an aluminum / steel dissimilar alloy; when the auxiliary laser beam goes before, the stability of laser deep penetration welding is improved and the effect of preheating treatment before welding is achieved; and when the auxiliary laser beam follows after, the wetting and spreading properties of aluminum are improved, and the effect of heat treatment after welding on the joint interface is achieved. By adoption of the double-beam laser deep penetration brazing method provided by the invention, the distribution of welding temperature fields can be controlled, the interfacial intermetallic compound distribution and thickness uniformity can be improved, and the high-quality and efficient dissimilar alloy connection can be achieved.

Description

technical field [0001] The invention is a double-beam laser deep-penetration brazing method. Double-beam laser deep penetration welding, as an improvement to traditional deep penetration brazing, belongs to the field of laser processing for joining dissimilar alloys. Background technique [0002] Aluminum and its aluminum alloys have excellent processability and corrosion resistance, and have been widely used in manufacturing industries such as aviation, aerospace, ships, and automobiles. However, steel has higher strength, better processing and welding performance, and has always been in a dominant position in the manufacturing industry. With the application of more and more aluminum and aluminum alloy structural parts in the manufacturing industry, the connection of steel and aluminum has become a hot issue that people pay attention to. [0003] In terms of shipbuilding, more and more ships use aluminum alloy to manufacture superstructures, thereby reducing their own wei...

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the high-efficiency and high-quality connection requirements of steel / aluminum dissimilar alloys for medium-thick plates (above 6mm) used in ships, and the problems existing in single laser fusion brazing steel / aluminum dissimilar alloys, and proposes a method suitable for medium-thick plate steel / A new method of double-beam laser deep penetration brazing for efficient and high-quality connection of aluminum dissimilar alloys

Images