Method for light alloy welding and multi-pass system

Abstract

The invention discloses a method for light alloy welding and a multi-pass system. The method is characterized in that energy of a solid laser used for welding is divided into three paths through a main optical path and two auxiliary optical paths, the three paths of dividing laser are coupled respectively and enter a three-path optical fiber, and the three paths of laser that are coupled and enter the optical fiber are connected with three output heads of a three-optical-path output device to realize flexible output. According to the multi-pass system, a 45-degree total reflective mirror, a 45-degree semi reflective mirror for the main optical path, a 45-degree semi reflective mirror for one auxiliary optical path, and a 45-degree total reflective mirror for the other auxiliary optical path divide the energy of the laser into three paths; when the three beams of laser are arranged serially along the welding direction, an effect of preheating and slow-cooling light alloy (such as aluminium alloy) can be achieved, the absorptivity is increased, and hot cracks of welding seams and air holes are reduced; and when the three beams of laser are arranged in a parallel or cross manner along the welding direction, the weld width of a welding seam can be enlarged, the phenomenon that a focus point diverges from the welding seam can be avoided, and the clearance adaptiveness of laser to the welding seam can be improved.

Description

technical field [0001] The invention relates to the technical field of laser welding processing, in particular to a method and a multi-optical path system for light alloy welding. Background technique [0002] Lightweight alloy materials refer to low-density alloys with magnesium, aluminum, titanium, etc. as the main components, and are generally also called light alloys, light metals or light alloys. Due to the low-carbon requirements of energy saving and consumption reduction, the automobile, electrical appliance, aerospace and equipment manufacturing industries have paid more and more attention to and increased the use of light alloy green materials represented by magnesium alloy, aluminum alloy and titanium alloy. According to calculations, every 10% weight loss of a car will reduce fuel consumption by 8% to 10%. Taking magnesium alloy as an example, if each car can use 70kg of magnesium alloy, CO 2 The annual emissions can be reduced by more than 30%, and the weight r...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of thermal cracks, pores, irregular welds, low absorption rate and welding efficiency in the welding of light alloy thin plates, the present invention provides a method and multi-optical path system for light alloy welding, especially suitable for easy-to-produce Welding of light alloy sheets with welding defects, the specific technical scheme is as follows

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