Method of forming a product of two different metals

The method of forming a product of two different metals in a closed die having a male punch element and a female punch element wherein a first metal member is connected to a second metal member of a smaller size comprising the steps of:

• a. providing a recess in one end of said first metal member of a size to receive one end of said second metal member,
• b. preplating at least one of said metal members with another metal selected from the group consisting of indium and tin,
• c. placing said first metal member and said second metal member in said closed die with said one end of said second metal member projecting into said recess in said first metal member with the other end of said first metal member being adjacent said male punch element and the other end of said second metal member extending into said female punch element, and
• d. applying high pressure to the outermost end of at least one of said metal members through at least one of said punch elements to impart relative movement of said metal members toward each other while in said closed die to form a recess in said other end of said first metal member by said male punch element and simultaneously cause flow of the metals together at the point of contact of said metal members with displacement of one metal in the other at said point of contact whereby surface impurities are removed from the interface of the connected portions of said metal members and a metal to metal joint is provided therebetween.