某雷达冷板双轴肩搅拌摩擦焊接工艺试验

文中介绍了某雷达MB8镁合金冷板的双轴肩搅拌摩擦焊接试验。双轴肩搅拌摩擦焊接技术对夹具设计以及应用环境的要求较常规搅拌摩擦焊接低。本试验中搅拌头转速设计为1000～1600 r／min，焊接速度设计为100～160 mm／min。通过测量冷板焊接接头处的拉伸强度和硬度，分析了焊接工艺参数对接头力学性能影响的机制。试验结果表明，MB8镁合金冷板双轴肩搅拌摩擦焊接接头处没有出现未焊透、气孔和夹杂等镁合金熔焊常见的缺陷，接头处的拉伸强度为199～211 MPa，平均拉伸强度达到母材强度的91％，接头处布氏硬度为30～39 HBS ，相比母材略有下降。试验结果说明双轴肩搅拌摩擦焊接技术非常适合用于冷板以及其他结构件的焊接。

Experiment of Bobbin-tool Friction Stir Welding for a Radar Cold Plate

Bobbin-tool friction stir welding (BTFSW) experiment of the MB8 magnesium alloy cold plate of a radar is presented in this paper. Requirements for welding jig and environment in BTFSW technology are lower than traditional friction stir welding (FSW). The rotating speed of stir head is designed to be 1 000~1 600 r/min and the welding speed is designed to be 100~160 mm/min. Based on the measurement results of tension strength and hardness in welding joint, the effect of welding parameters on joint mechanical properties is analyzed. Experiment results show that poor penetration, blowholes and inclusions which are common defects in magnesium alloy fusion welding are not found in MB8 welding joint after BTFSW, the tension strength in welding joint is 199~211 MPa, the average tension strength reaches 91% of base metal and the hardness is 30~39 HBS which has small decrease comparing with base metal. It also indicates that BTFSW technology is impactful in the welding of cold plate and other structure parts.