7N01铝合金激光-MIG复合焊接工艺研究

Process of 7N01 Aluminum Alloy Welding by Hybrid Laser-MIG Welding Method

以4 mm厚7N01铝合金为研究对象,通过改变激光功率、MIG焊接电流﹑焊接速度等焊接工艺参数,研究了其激光-MIG复合焊接工艺,并对不同工艺下接头的抗拉强度及显微组织进行了研究。结果表明,激光-MIG复合焊能够非常高效地焊接7N01铝合金,在最优工艺下接头的抗拉强度为256.94 MPa,达到母材抗拉强度的59.75%;通过降低激光功率提高MIG焊接电流,可以有效地改善接头的气孔缺陷,提高接头力学性能;接头的组织为典型的激冷结晶组织,主要为树枝晶和等轴晶。

Hybrid laser-MIG welding parameter of 7N01 Aluminum alloys is optimized through changing the output power of the laser, the arc current, and welding speed. The tensile strength under different welding parameters, and the microstructure of the joint were studied. The results show that excellent jonts can be obtained using hybrid laser-MIG welding, the tensile strength is 256.94 MPa, which reaches up to 59.75% of the parent material＇s strength. And the porosity of the joints can be avoided by changing the power of the laser and the arc current, the dendrite crystal and the isometric crystal are the main crystal form of the joint.