xEVに向けた純銅レーザ溶接の高品質化

抄録

Recently, the electrification of vehicles has been progressing toward carbon neutrality. As the electrification of cars progresses, the number of copper bar junctions will increase. It’s junction’s point of view, welding with fiber laser is attractive because of its deep welding depth, narrow heat affected zone and productivity.

On the other hand, when we weld copper plates with the conventional IR fiber laser, a large amount of spatter and welding defects occur. To suppress this welding defect, we tried to weld copper plate with the fiber laser which adopted beam mode control technology or blue–IR hybrid laser. As a result of that, we succeed suppressing the welding defects. We assumed it was caused by the opening around the keyhole in the molten pool.