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采用连续驱动摩擦焊技术对45#中碳钢进行连接,采集焊接过程的摩擦扭矩,并对接头进行了显微组织观察和显微硬度分析。结果表明:转速越高,扭矩上升速度越慢,峰值越低,摩擦压力对扭矩影响不明显;摩擦焊接头由焊缝区、热力影响区和母材区组成,焊缝区为受焊后余热长大形成的粗晶组织,热力影响区为正火后的细晶组织;接头显微硬度沿轴向由摩擦界面向母材呈下降趋势,不同位置处和不同规范参数下的硬度值差异明显。
Continuous driving friction welding technology was used to connect 45 # carbon steel, and the friction torque of the welding process was collected. Microstructure and microhardness analysis of joints were carried out. The results show that the higher the rotational speed is, the slower the torque rise speed is, the lower the peak value is. The friction pressure has no obvious influence on the torque. The friction weld joint consists of weld zone, heat affected zone and base metal zone. The coarse grain formed by growth and the heat affected zone was the fine grain structure after normalizing. The microhardness of joint decreased from the friction interface to the parent material along the axial direction, and the hardness values at different positions and under different normative parameters were significantly different .