不同焊丝对低合金钢焊接接头组织及性能的影响

Effect of different welding wires on microstructure and propertiesof low-alloy steel welding joints

分别采用实心焊丝和药芯焊丝作为填充金属,在不同的工艺参数下焊接12 mm厚的Q345E对接接头,研究了不同焊丝对接头和焊缝金属抗拉强度、低温冲击韧性和显微硬度的影响,并观察分析了接头的微观组织.结果表明:药芯焊丝和实心焊丝焊接接头拉伸均断于母材;药芯焊丝焊缝金属抗拉强度较实心焊丝焊缝提升约16%;药芯焊丝接头低温冲击韧性优于实心焊丝;药芯焊丝焊缝的平均硬度高于实心焊丝焊缝的平均硬度.

Solid wire and flux-cored wire were used as filler metals respectively,and 12 mm Q345E butt joints were welded by MAG under different process parameters.The effect of different wires on the tensile strength of the joint and weld metal,low temperature impact toughness and micro-hardness of the joint were studied.The results show that the welding joints of flux-cored wire and solid wire are broken from the base material;the tensile strength of the weld metal of flux-cored wire is improved by about 16%compared to the welds of the solid wire;the impact toughness of the weld metal of flux-cored wire is better.The average hardness of the welding seam of flux-cored wire is higher than that of the solid welding wire.