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点焊机实际工作中的表现特点分析

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点焊机

点焊机体育外围点焊不锈钢时产热易,点焊铝合金时产热难而散热易.点焊时,前者可用较小电流(几千安培),大电流(几万安培 电极压力对两电极间总电阻R有明显的影响随着电极压力的增大,显著减小,而焊接电流增大的幅度却大不能影响因R减小引起的产热减少。因此,焊点强度总随着焊接压力增大而减小。比如就是焊点的焊接物理特性,但是实际情况往往不能满意这种标准,一般会做个破坏性试,点焊机的好坏取决于焊点的撕裂坏试验,点焊机的好坏不光是外观,还要强调整体性能,有的用户以为移动点焊机和普通电焊机一样,故把点焊机的地线随意搭接在工件上,然后在任一点焊接,但是效果很不理想,这是因为点焊机的二次电压一般在4-8伏左右,依靠较大的电流几千-1.5万左右,在最短的金属间(上下电极的距离)形成回路,在很短的时间发生较大的电阻热形成焊核,如果两个电极距离较远,那就等于给金属加热了,造成较大的电飘流费。当工件和电极一定时,工件的电阻取决与它的电阻率。

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