(1. 北京工業(yè)大學 材料與制造學部，北京 100020；
2. 江蘇恒熠金屬制品有限公司，泰州 225400)
摘 要: 設計了三種含量(質(zhì)量分數(shù))分別為5%、10%和15%的微米氟化物，采用機械涂敷方法在ER5356鋁合金焊絲表面制備了氟化物涂層，并與無涂層商用焊絲進行了熔化極氣體保護焊(GMAW)工藝性對比。結(jié)果表明: 微米氟化物涂層鋁合金焊絲的焊縫中氣孔率顯著下降，當涂層中氟化物含量為10%時，焊絲抗氣孔性最佳，相比于無涂層的鋁合金焊絲，其焊縫氣孔率降低約1.6%，接頭抗拉強度達到280.79 MPa，提高約2.9%。表面涂敷氟化物涂層的焊絲通過改變電弧形態(tài)增加焊縫熔深，從而影響成形外觀和力學性能。
關鍵字: 鋁合金焊絲；GMAW；表面涂層；氣孔性；力學性能
（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
