When two dissimilar metals differ greatly in strength,using a pressure maintain cavity is one of the effi-ciency method to overcome difficulty because of the severe plastic deformation.

• 两种强度相差较大的异种金属进行摩擦焊接时，使用保压腔是克服由于软金属的大量塑性变形而给焊接过程带来困难的有效手段之一。