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研究了搅拌摩擦焊法搭接TA2工业纯钛和T2紫铜。工艺优化实验结果表明:Cu/Ti搭接搅拌摩擦焊工艺窗口较窄,在搅拌头转速800 r/min、焊速20 mm/min以及搅拌头转速900 r/min、焊接速度30 mm/min的焊接工艺参数配比条件下,可获得无缺陷且焊缝表面、搭接界面成形良好的Cu/Ti接头。对搅拌头转速800 r/min、焊速20 mm/min的焊接参数下获得的Cu/Ti接头焊缝进行金相和SEM观察,分析结果表明:搭接界面两侧Cu、Ti宏观流动现象明显,Ti向Cu一侧的塑性材料流动量要明显优于Cu向Ti一侧,且在局部机械混合区呈典型的Cu/Ti相间条带状结构;在搭接界面处形成一层平均厚度约为4.8μm的扩散过渡层,在过渡层中Cu的扩散速度要大于Ti的扩散速度,Cu/Ti搭接界面形成冶金结合。
Studied the friction stir welding lap TA2 industrial titanium and T2 copper. The results of the process optimization show that the technological window of Cu / Ti lap joint friction stir welding is very narrow, with a speed of 800 r / min, a speed of 20 mm / min, a speed of 900 r / min, a speed of 30 mm / min Under the conditions of the welding process parameters, a Cu / Ti joint with no defects and a well-formed weld surface and a lap interface can be obtained. The metallographic and SEM observations of the Cu / Ti joint welds obtained at a welding speed of 800 r / min and a welding speed of 20 mm / min showed that the macroscopic flow of Cu and Ti on both sides of the joint was obvious , The flow of Ti to Cu side plastic material is obviously better than that of Cu to Ti side, and it is typical Cu / Ti interphase ribbon structure in the local mechanical mixing zone. At the lap interface, a layer of average thickness about Is 4.8μm diffusion transition layer in the transition layer of Cu diffusion rate is greater than the diffusion rate of Ti, Cu / Ti lap interface to form a metallurgical bond.