Welding method and system for reducing laser welding heat affected zone and refining structure

Abstract

The invention belongs to the technical field of laser welding, and particularly discloses a welding method and system for reducing a laser welding heat affected zone and refining a structure. The method comprises the steps that the surface of a to-be-welded workpiece is pretreated; s2, welding process parameters and working parameters of the conformal condensation plate are set; s3, integrating an ultrasonic generating device, wherein the laser head and the ultrasonic generating device are arranged at an interval; s4, according to the set welding process parameters, the workpiece is welded in the vacuum environment, the laser head moves according to the preset path and speed, the conformal condensation plate works, meanwhile, the ultrasonic generation device is started, and ultrasonic vibration is conducted on a welding seam of the workpiece; and S5, the workpiece is subjected to recrystallization annealing at the specified temperature. According to the method, welding energy distribution is accurately regulated and controlled, meanwhile, the follow-up condensation plate with the self-adaptive temperature adjustment is assisted, follow-up ultrasonic treatment is carried out on a welding seam, then laser welding forming and quality are optimized and regulated, the structure property uniformity is improved, a laser welding heat affected zone is reduced, and the structure is refined.

Description

technical field [0001] The invention belongs to the field of laser welding, and more particularly, relates to a welding method and system for reducing the heat-affected zone of laser welding and refining the structure. Background technique [0002] In the process of fusion welding, the metal material is melted under the action of the heat source to form a weld. Between the weld metal and the base metal, there is a certain range of areas affected by the heat of the welding process, which is called the heat-affected zone. Due to the effect of welding thermal cycle, the microstructure of the weld zone and the heat-affected zone is different from that of the base metal, and often shows a coarse group, which in turn affects the service performance of the welded joint. In many practical engineering applications, there are often certain requirements for the width of the heat-affected zone and the microstructure of the weld. Therefore, reducing the width of the heat-affected zone a...

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Problems solved by technology

However, this method uses a low-temperature protective gas to protect and cool the molten pool and its vicinity. The atmosphere environment requires high requirements and is difficult to control. At the same time, it still needs to bevel the base metal and cannot meet the one-time forming of the medium-thick plate connection. complex

Patent document CN201210002191.6 discloses a vacuum laser welding equipment and method. The description of the process means of this method is too simple, and the swing laser is not used to tune the energy field, which cannot ensure the uniformity and performance of the large-thickness welded joint in the thickness direction. sex

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