为了研究高功率光纤激光焊接工艺参量对底部驼峰倾向的影响,采用单一变量方法研究了激光功率、焊接速度、离焦量、下表面保护气体流量及焊接方位的变化对底部驼峰的影响.结果表明,随激光功率的增加,底部驼峰倾向先加大后减小;焊接速率提高时,底部驼峰高度先增加后减小,驼峰间距明显减小;离焦量在0mm附近时,底部驼峰倾向较大;适当的下表面保护气体流量有助于减小底部驼峰倾向,最佳流量为15L/min;焊接方位为60°时,一定程度上可减小底部驼峰倾向.优化后的工艺参量合理,可有效地消除底部驼峰.

In order to study influence of welding parameters on root humps in high power fiber laser welding,effect of laser power,welding speed,defocus,flow rate of bottom shielding gas and welding position on root humps was studied based on a single variable method.The results show that,with the increase of laser power,root humps tend to increase at first and then decrease.When welding speed increases,root hump height increases at first and then decreases,root hump spacing decreases significantly.When defocus is near 0mm,root hump tendency is obvious.Under the appropriate flow rate of bottom shielding gas,root hump tendency is reduced.The optimal rate is 15L/min.When welding orientation is 60°,root hump tendency decreases to a certain extent.The results show that reasonable welding parameters can eliminate root hump efficiently.