以ER5356焊丝为填充金属,6061铝合金板材为母材,进行了冷金属过渡焊接(CMT)试验。通过改变焊接时的送丝速度而得到不同的焊接试样,对其微观组织和力学性能进行了观察测试。结果表明,6061铝合金经CMT焊接后热影响区宽度相对MIG焊较小,热影响区的晶粒粗大,硬度值最低,大约为45 HV;焊接的四组试样最大的抗拉强度为192.8 MPa,是母材抗拉强度的78.4%。 With ER5356 wire as filler metal and 6061 aluminum alloy as base material, cold-metal transition welding (CMT) test was carried out. Different welding samples were obtained by changing the wire feeding speed during welding, and their microstructure and mechanical properties were observed and tested. The results show that the width of heat-affected zone of 6061 aluminum alloy after CMT welding is smaller than that of MIG welding, the grain size of the HAZ is coarse and the hardness value is the lowest, about 45 HV. The maximum tensile strength of the welded four groups of samples is 192.8 MPa, which is 78.4% of the tensile strength of the base metal.