搅拌摩擦焊接过程中, 焊件上任一位置于搅拌头行走到该位置所在垂直于焊缝直线的瞬间, 热循环温度达到最大值, 并随着搅拌头远离而迅速降低. 焊缝起点受搅拌头扎入行为的影响, 而焊缝终点受搅拌头提起行为的影响, 二者经受的热循环温度低于焊缝其它部位. 然而焊缝起点和终点间的材料经受稳定的热循环作用. 焊缝中心经受的焊接热循环温度最高, 为415 ℃. 焊缝两侧材料经受不同的热循环作用, 前进侧略高于后退侧7～12 ℃.
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