Fundamentals of Solid-Phase Welding

Abstract

Solid-Phase Welding is of basic significance in pressure welding, friction, wear, and powder metallurgy, and it is reasonable to expect that an adequate understanding of the fundamentals of the bonding process would lead to a unification of the underlying principles of these subjects, with considerable advantages of simplification and cross-fertilization. To a large extent, however, each subject has been pursued independently and the major current theories represent quite different approaches to the process of adhesion. When the mechanism of bonding is eventually elucidated the relative significance of each approach will presumably be apparent, but a number of gaps in information have to be filled before this can occur. Solid-phase welding is therefore here considered from two points of view: to assess the evidence contributed by each field towards an understanding of the mechanism of bonding, and to clarify those problems that most require solution to develop a comprehensive basis for the subject.