Metal-Joining Methods

摘要: Metal-joining methods play a prominent role in modern technologies since virtually all products are fabricated by joining processes that require joint integrity equal or surpass component integrity. This field is extremely broad (1-6), involving many scientific and engineering disciplines, myriad of metals alloys, conceivable design criteria. Typical include arc welding, electron beam diffusion bonding, chemical vapor deposition, adhesive soldering, brazing. Although originally developed on an empirical basis, these becoming more dependent sound prin­ ciples to satisfy the needs advancing materials technology. Indeed, so important society could not exist without considerable expertise this field. Joining may be defined formally as process bringing two surfaces into intimate contact order establish continuity across resulting interface-electrical denotes establishment electric interface, mechanical stress etc. Initially, joined must prepared they compatible with one another, both chemically mechanically. Many technological approaches associated circumventing prob­ lems involve protective atmosphere, insertion intermediate layer between surfaces, cleansing, fluxing, melting, coating joined. Even when satisfactory devised, subsequent performance often limitcd structural alterations occur during con­ comitant degradation properties thereafter. problems preparation clean nonuniform solidification weld materials, interfacial induced periodic heating cooling, solid-state interdiffusion, undesirable phase formations, creep, corrosion, fracture, gradual electrical