1420铝锂合金双光点激光焊接头成形

Joint formation by twin-spot laser welding of 1420 aluminium-lithium alloy

在对2 mm厚1420铝锂合金开展双光点激光焊接试验的基础上,研究了激光功率、焊接速度、离焦量等焊接参数和光点间距、排列位向角度、能量分配等双光点调节参数与焊接接头成形特征的关系;对比分析了单、双光点激光焊接参数和接头成形特点.结果表明,1420铝锂合金双光点激光焊接参数阈值范围较单光点激光窄;光点间距对接头成形的影响大小取决于光点能量分布;光点能量分布在40/60和60/40时,接头成形较好;光点位向由串行排列到并行排列过程中,接头正面熔宽增加,熔深减小.

Based on the trial of twin-spot laser welding of 2 mm thick 1420 Al-Li alloy,the effect of laser welding parameters including laser power,welding speed,defocusing distance and twin-spot adjust parameters including focus spacing,focus orientation,intensity distribution of the foci on the formation of the joints was studied.The characteristics of weld formation in single-spot and twin-spot welding were compared and analyzed.The results indicated that the process window in twin-spot laser welding was narrower than in single spot laser welding,but the weld quality was improved prominently.The effect of focus spacing on the weld formation was related to intensity distribution of the foci,which had an essential influence on the welding result.In order to get a higher penetration and failure free seams,a 40% to 60% and a 60% to 40% distribution were better.Furthermore the focus orientation had another slight impact on the welding result.