不锈钢长焊缝CO_2激光焊接特性实验研究(邀请论文)

Experimental Study of Characteristics of Long Seam Welding With CO_2 Laser(Invited Paper)

采用CO_2激光焊接不锈钢,研究了长焊缝焊接中轴向保护和侧保护对焊接熔深的影响规律.结果表明:轴向保护时,熔深随着焊接长度的增加而明显减小;侧保护时,熔深几乎不随焊接长度的变化而变化;光路系统的热透镜效应对熔深的影响不明显.进一步分析表明,轴向保护对等离子体的控制效果较差是长焊缝中熔深随焊接长度减小的原因,可通过间断焊接的方式避免等离子体的不利影响.

In this paper, the influences of both axial and off-axial protection on weld penetration were investigated during long seam welding of stainless steel with a CO2 laser. The results showed that the weld penetration obviously decreased with the increase of welding length in axial protection. On the other hand, the weld penetration hardly changed with the change of welding length in the welding with off-axial protection. The thermal lens effect of light path system on weld penetration was not obvious. Further analysis shows that the poor control of plasma in axial protection is the reason why the weld penetration decreases with the increase of welding length. The negative effect of plasma on the weld penetration can be avoided by using the discontinuous welding in axial protection.