摘要
采用YAG激光作为焊接热源,对3mm厚的奥氏体不锈钢板和直径6mm、壁厚0.4mm的不锈钢管单面激光焊接工艺进行了研究。实验结果表明:对焊面的打磨、抛光和紧密接触对防止焊缝中产生过多的气孔和提高焊缝的机械性能有重要作用;激光功率密度、焊接速度、脉冲宽度和脉冲频率四个参数是实现脉冲激光焊接的关键因素。经理论推导,确定了在脉冲激光最大平均输出功率300W、单脉冲能量60J、脉冲频率5Hz、焊接速度0.75mm/s的限定条件下,最佳工艺参数组合为脉冲宽度8ms和峰值功率7.5kW。与经钎焊所得焊缝质量相比,其抗剪切强度有明显提高。
The bosseyed welding technology of low power YAG laser for18-8 type austenitic stainless steel plate and steel tube with the thickness of 3mm and the diameter of 6mm ＆ the wall thickness of 0.4mm was studied. Experiment result indicates that laser power density, welding speed, pulse frequency and pulse width are the key factors of pulse laser welding and that the polishment, close touch of butt joint faces have an important effect on the air vents number in welding line and the mechanical performance of welding line. By way of theory deduction, on the controlled condition that maximal average output power is 300W, single pulse energy is 60J, frequency is 5Hz, welding speed is 0. 75mm/s, the optimum values of gainning an excellent welding quality were confirmed to be peak power is 7.5kW and pulse width is 8ms.
出处
《应用激光》
CSCD
北大核心
2009年第4期320-324,共5页
Applied Laser
关键词
YAG激光焊接
不锈钢
焊缝形貌
YAG laser welding
stainless steel
welding line shape
