LF6铝合金激光填丝点焊工艺研究

Laser Spot Welding of LF6 Aluminum Alloy with Filler Wire

针对铝合金激光点焊容易出现的问题,自建了一套精确控制送丝系统,分析铝合金激光填丝点焊的可行性,并且研究了送丝角度、延迟时间、送丝量等送丝参数的影响。研究结果表明,激光填丝点焊可以明显地改善铝合金激光点焊过程中容易出现的缺陷;送丝角度是焊丝熔化后能否稳定进入熔池的关键因素,送丝角为30°左右时,熔化焊丝进入熔池最为稳定;延迟时间过短,熔池尺寸过小时送进焊丝,易造成焊丝在试件上表面的堆积;而送丝量与焊点表面下塌的改善效果相关。

In view of problems of laser spot welding of aluminum, a precise control wire filler is built, and the feasibility of laser spot welding of aluminum alloy with filler wire and the influences of filler wire angle, wire feed volume, delay time are analyzed. Experimental results show that the filler wire method can improve the defects of laser spot welding of aluminum. The angle of the filler wire is the key factor which influences the stability of the process of the melt wire into the pool. When the wire is feed at an angle of 30~ or so, the feed process is most stable. The delay time is one of the main factors which determine the pool size. When the delay time is too short, the filler wire can be easily accumulated on the surface of the specimen. The volume of the wire feed into the pool is directly related to the improved effect of collapse.