In order to study laser welding post-weld-shift ( PWS) of coaxial laser diodes based on finite element thermal theory and structural coupling theory , 3 beams laser welding model of coaxial laser diode was developed .Parameters affecting PWS were analyzed and meanwhile , correction experiment of laser hammer was studied .Coupling optical power value was obtained before and after laser welding and after correction .The simulation results demonstrate that power distribution and position distribution of three weld spots have influence on PWS of laser welding of coaxial laser diodes .Coupling light power is on the rise after laser hammering correction , and the maximum coupling power can be up to 94%.Finite element method can be used to prove the reasonable predict of PWS direction .The results have a certain guiding significance on production of coaxial laser in laser welding .%为了研究同轴型激光器激光焊接产生的焊后偏移(PWS),采用基于有限元热-结构耦合理论的分析方法,建立了同轴型激光器3束激光焊接模型,分析了激光焊接工艺参量对焊后偏移的影响规律,并进行了激光锤校正实验研究,获得了同轴型激光器激光焊接前后及校正后的耦合光功率值. 结果表明,同轴型激光器的焊后偏移受到3个焊点功率分布和位置分布等因素的影响;耦合光功率在激光锤校正后整体呈上升趋势,最大耦合光功率可恢复至94%,有限元仿真分析对PWS的方向预测合理. 这一结果对激光焊接同轴型激光器的生产具有一定的指导意义.
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