TA2中厚板低功率激光诱导双电弧高效焊接及机理

采用低功率脉冲激光诱导双TIG复合焊接热源(LITTW)实现了6 mm厚TA2纯钛中厚板的高效焊接，基于Ti粒子的动力学行为，研究了激光脉冲对电弧等离子体的影响.结果表明，LITTW比激光诱导单TIG焊接(LISTW)的电弧能量更加集中，焊接能耗仅为LISTW的50.9%，速度却达到LISTW的2.3倍.激光脉冲作用后，电弧等离子体由能量集中状态恢复到原始电弧形态存在一个恢复时间，在本试验条件下，LITTW的恢复时间为6.5 ms，比LISTW延长了3 ms. LITTW中稳定的匙孔形态为Ti粒子持续向电弧等离子体转移提供了条件，延长了电弧等离子体的恢复时间.

Study on low power laser induced twin arc high-efficiency welding TA2 medium-thick plate

The high-efficiency welding of 6 mm TA2 pure titanium plate was realized by using low power pulsed laser induced twin TIG hybrid welding heat source (LITTW). Based on the dynamic behavior of Ti particles, the effect of laser pulse on arc plasma was studied. The results show that the arc energy of LITTW is more concentrated than that of laser induced single TIG welding (LISTW). The welding energy consumption is only 50.9% of that of LISTW, but the welding speed is 2.3 times of that of LISTW. After the laser pulse action, there is a recovery time for the arc plasma to recover from the energy concentration state to the original arc shape. Under the experimental conditions, the recovery time of LITTW is 6.5 ms, which is 3 ms longer than that of LISTW. The stable keyhole morphology in LITTW provides conditions for the continuous transfer of Ti particles to arc plasma and prolongs the recovery time of plasma.