Ultrahigh-strength steel following welding ultrasonic-assisted laser welding system and method

Abstract

The invention discloses an ultrasonic-assisted laser welding system and an ultrasonic-assisted laser welding method for welding ultrahigh-strength steel along with welding, an ultrasonic generating device is connected with a laser welding head through a connecting clamp, and the ultrasonic-assisted laser welding process along with welding is realized under the driving of a robot. A front contact ultrasonic applying mode is adopted, a high-frequency vibration energy field of ultrasonic waves acts on a welding pool through a to-be-welded test plate, and a series of beneficial effects are utilized to improve the solidification and crystallization process of a welding seam. And a tail air cylinder of the ultrasonic generating device continuously provides pressing force for the ultrasonic amplitude-change pole in the welding process. The six-axis robot is adopted for driving, welding of complex tracks and spatial positions can be achieved, an original laser welding system is not changed, and equipment composition is simple. According to the method, the ultrasonic energy field is introduced into the laser welding pool, so that the problems of cold cracks and softening and embrittlement of a heat affected zone easily occurring during welding of the ultrahigh-strength steel for spaceflight can be effectively inhibited, and the comprehensive performance of a joint is improved.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency laser welding manufacturing of aerospace structural parts, and in particular relates to an ultrasonic-assisted laser welding system and method for ultra-high-strength steel with welding. Background technique [0002] Ultra-high-strength steel generally refers to steel with a room temperature tensile strength exceeding 1400MPa and a yield strength greater than 1200MPa. It is mainly used for rocket engine shells, engine nozzles and boosters at all levels. 30Cr3 steel is a martensitic low-alloy ultra-high-strength steel independently developed by relevant units in my country on the basis of summarizing ultra-high-strength steels at home and abroad. Manufacture of solid rocket power module shells. [0003] Because 30Cr3 steel has high carbon content, many alloy elements, and a large hardening tendency, it is prone to cold cracks and softening and embrittlement problems in the heat-affected zon...

AI Technical Summary

Problems solved by technology

For the welding of ultra-high-strength steel 30Cr3 for aerospace, currently only electron beam welding and argon tungsten arc welding are involved, and there are no reports and applications of ultrasonic-assisted laser welding methods with welding

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