(1. 北京工业大学 材料与制造学部，北京 100020；
2. 江苏恒熠金属制品有限公司，泰州 225400)
摘 要: 设计了三种含量(质量分数)分别为5%、10%和15%的微米氟化物，采用机械涂敷方法在ER5356铝合金焊丝表面制备了氟化物涂层，并与无涂层商用焊丝进行了熔化极气体保护焊(GMAW)工艺性对比。结果表明: 微米氟化物涂层铝合金焊丝的焊缝中气孔率显著下降，当涂层中氟化物含量为10%时，焊丝抗气孔性最佳，相比于无涂层的铝合金焊丝，其焊缝气孔率降低约1.6%，接头抗拉强度达到280.79 MPa，提高约2.9%。表面涂敷氟化物涂层的焊丝通过改变电弧形态增加焊缝熔深，从而影响成形外观和力学性能。
关键字: 铝合金焊丝；GMAW；表面涂层；气孔性；力学性能
（1. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China;
2. Jiangsu Henyi Metal Production Company, Taizhou 225400, China）
Abstract:Three kinds of micro fluoride with mass fractions of 5%, 10% and 15%, respectively were designed. Then the fluoride lubricants were coated on ER 5356 aluminum alloy welding wire by using mechanical coating method. The weldability of coated wires for GMAW was evaluated in comparison to the uncoated wire. The results show that the porosity is distinctly reduced by using the micro fluoride lubricant coated wire. The coating with 10% (mass fraction) fluoride has the highest porosity resistance. In this case, the porosity of the welding bead is decreased by around 1.6% compared with the uncoated welding wire. Meanwhile, the tensile strength of the welding joint reaches 280.79 MPa, which is about 2.9% higher. The penetration depth of the welding bead is increased by the fluoride lubricant coated wire through changing the arc profile, thereby the weld formation and joint mechanical properties are improved.
Key words: aluminum alloy wire; GMAW; surface coating; porosity; mechanical property
