Joint of metallic materials connected at a joining zone

Abstract

Different metallic materials are joined in such a manner that friction heat generated by fiction between a rotating probe made of a hard material and one of the metallic materials having a lower mechanical strength or a lower melting point than the other to effect plastic flow of the one material and the probe is inserted into a pit formed in a joint zone of the other material to fill the pit with the plastic flow material.

What is claimed is:  
     
         1 . A joint of metallic materials connected at a joining zone, wherein one of the materials has a pit in the joining zone, and wherein the pit is filled with the other material in the joining zone by plastic flow of the other material.  
     
     
         2 . The joint according to  claim 1 , wherein the materials to be joined are an aluminum alloy and steel, the pit being formed in the steel, and aluminum alloy being filled in the pit.  
     
     
         3 . The joint according to  claim 1 , wherein the materials to be joined are an aluminum alloy and a copper alloy, the pit being formed in the copper alloy, and the aluminum alloy being filled in the pit.