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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。
YAG laser was used as welding heat source to study the single-side laser welding process of 3mm-thick austenitic stainless steel plate and 6mm diameter stainless steel pipe with a wall thickness of 0.4mm. The experimental results show that the polishing, polishing and close contact of the welding surface play an important role in preventing excess porosity and improving the mechanical properties of the weld. The laser power density, welding speed, pulse width and pulse frequency Is to achieve the key factor of pulsed laser welding. According to the theoretical deduction, the optimum process parameters were determined as pulse width 8ms and peak power 7.5kW under the conditions of the maximum average output power of pulsed laser 300W, single pulse energy 60J, pulse frequency 5Hz, welding speed 0.75mm / s. Compared with the quality of the weld obtained by brazing, its shear strength has been significantly improved.