激光-TIG复合热源焊接参数对镁/钢异种材料焊接接头的影响

Effect of laser-TIG hybrid welding parameters on joint of Mg to steel

采用激光—TIG复合热源的焊接方法对镁和钢异种材料进行焊接,探讨了焊接工艺参数包括激光功率、激光离焦量、焊接速度以及TIG焊接电流对焊缝抗拉强度的影响。结果表明,在焊接过程中,随着激光功率的增大、焊接速度的减小,焊缝抗拉强度随之增大;随着激光离焦量的增加,焊缝抗拉强度呈现先增大后减小的特点;而TIG电流的变化对焊缝抗拉强度影响不大。试验证明,在合适的工艺参数下,能够得到成形良好、力学性能优良的镁/钢异种材料的焊接接头,并且在焊接过程中,激光对镁和钢的连接起主要作用。

The lap joining of magnesium alloy AZ31B to steel Q235 by laser-tungsten inert gas(TIG) welding was investigated.The effect of welding parameters on the tensile strength was studied,including laser power,welding speed,laser defocusing amount and current of TIG.It is indicated that the tensile strength of joint increases when the laser power gets higher.But the tensile strength of joint decreases when welding speed gets higher.The current of TIG has nothing to do with the tensile strength.A weld with ideal a...