镁合金激光氩弧复合热源冷填丝焊接工艺

Low powered laser-arc hybrid welding of magnesium alloy with cold filler wire

研究了镁合金的低功率激光—氩弧复合热源冷填丝焊接工艺。通过5mm厚镁合金板材的堆焊试验,研究了焊接电流、焊接速度、钨极高度和热源距离等参数对焊缝成形和焊接熔深的影响,确定了钨极高度为0.75mm,热源间距DLA为1.2mm左右的焊接参数范围;在堆焊基础上,进行了2.5mm厚镁合金板材的对焊试验,实现了单面焊双面成形,焊接速度达1200mm/min,焊接接头熔深为单TIG冷填丝接头熔深的两倍,抗拉强度达到母材的95%左右,实现了高速、优质的镁合金冷填丝焊接。另外,简要分析了激光的加入对焊接过程的影响。

Low powered laser-arc hybrid welding of magnesium alloy with cold filler wire was studied.The effect of welding parameters on weld appearance and penetration was investigated in bead welding experiments of magnesium alloy plate with the thickness of 5 mm and the range of welding parameters was confirmed,such as the electrode height(about 0.75 mm)and the distance between laser and arc(about 1.2 mm).Based on this,magnesium alloy plate with the thickness of 2.5 mm was butt-welded successfully and the welding speed increases to 1 200 mm/min.The weld penetration of hybrid welding with cold filler wire is twice deeper that that of TIG welding and the tensile strength of hybrid welded joint achieves 95% of that of base metal,so magnesium alloy welded joint with high quality can be obtained by hybrid welding with cold wire at a high speed.Besides,the effect of laser pulses on welding process was analyzed.