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采用微机控制固定间隙超声波辅助汽车零部件焊接中Cu/Al异质金属的钎焊工艺,在钎焊温度为380、420和460℃时制备Cu/Zn-3Al/Al钎焊接头,观察了不同温度超声钎焊时接头的显微组织与力学性能变化。结果表明,当钎焊温度为380℃时,钎缝层由Zn-Al共晶、α-Al树枝状晶和CuZn5相组成;当钎焊温度为420和460℃时,发现钎缝层由α-Al树枝晶、CuZn5相和Al4.2Cu3.2Zn0.7相组成;在钎焊温度为420℃时,金属间化合物层厚度为1.9μm,扩散层厚度为1.3μm,整个界面层厚度为3种钎焊温度下的最低值,此时钎焊接头的抗拉强度最大。
A Cu / Zn-3Al / Al brazed joint was prepared by using computer-controlled fixed-gap ultrasonic-assisted soldering of auto parts of Cu / Al alloy at the brazing temperature of 380, 420 and 460 ℃. Microstructure and Mechanical Properties of Joints During Temperature Ultrasonic Brazing. The results show that when the brazing temperature is 380 ℃, the brazing layer consists of Zn-Al eutectic, α-Al dendrite and CuZn5 phase. When the brazing temperature is 420 ℃ and 460 ℃, -Al dendrite, CuZn5 phase and Al4.2Cu3.2Zn0.7 phase. When the brazing temperature was 420 ℃, the intermetallic compound layer thickness was 1.9μm, the diffusion layer thickness was 1.3μm, and the thickness of the interface layer was 3 Brazing temperature of the lowest value, then the maximum tensile strength of brazed joints.