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采用3.5kW Slab CO_2激光焊接不锈钢,利用高速摄像观测焊接等离子体形态,采用光谱仪探测等离子体光谱,并利用相对强度法计算等离子体电子温度。结果表明:在氦气保护下,等离子体高度随时间周期性振荡,振荡频率约为530Hz;熔池表面附近等离子体的温度为8392K左右。进一步分析表明,等离子体对入射激光的吸收不足10%;等离子体周期性振荡对焊接过程稳定性影响不明显。
Stainless steel was welded by 3.5kW Slab CO_2 laser, the shape of welding plasma was observed by high-speed camera, the plasma spectrum was detected by spectrometer, and the plasma electron temperature was calculated by relative intensity method. The results show that under the protection of helium, plasma height periodically oscillates with time, the oscillation frequency is about 530Hz, and the temperature of the plasma near the weld pool surface is about 8392K. Further analysis showed that the plasma absorption of incident laser was less than 10%. The periodic plasma oscillation had no obvious effect on the stability of the welding process.