激光增强GMAW熔滴短路过渡行为分析

Laser enhanced short-circuiting metal transfer in GMAW

关键词:  熔化极气体保护焊  短路过渡  激光增强  受迫短路  高速摄像

Key words:  GMAW  short circuiting transfer  laser enhanced  forced short circuiting  high speed camera

摘要:

高能量密度的激光照射熔滴，使熔滴局部产生强烈蒸发，利用蒸发反力驱动熔滴受迫短路，促进熔滴脱离焊丝.以低碳钢为研究对象，搭建激光增强GMAW短路过渡焊接试验系统，对比研究了激光增强GMAW短路过渡焊接过程中激光入射位置、电弧高度对熔滴短路过渡行为的影响规律.结果表明，在焊接过程中施加一定功率的激光对熔滴短路过渡行为有明显的改善作用，可以通过激光改变熔滴的受力状态，控制过渡熔滴的尺寸，熔滴短路时间减小，燃弧时间增加，增加过渡频率，提高了焊接过程中的稳定性，激光增强后，焊缝表面成形均匀饱满，焊缝成形良好.

Abstract:

The high energy density of the laser beam irradiated the droplet to make it be subjected to local strong evaporation, and the laser recoil force was used to drive the droplet to be forced short circuit, which promoted the droplet to be detached from the wire. Taking the mild steel as the research object and using the high speed camera equipment, the laser enhanced GMAW short circuiting transfer welding test system was built. The influence of laser incident position and arc height on the transfer behavior of droplet short circuit in GMAW short circuiting transfer welding process were studied. The results show that the laser has a significant effect on the short circuiting transfer behavior of the droplet during the welding process. The force state of the droplet can be changed, which can control the size of the droplet. The droplet short circuiting time decreases, while the arcing time and transfer frequency increase, which improves the stability of the welding process. After the laser is applied, the metal transfer is much more frequent and robust. The bead formation looks fine and uniform.