Thermogravimetric Analysis of Friction Welding of Dissimilar Material

Abstract

The establishment of energy-saving and natural resource-saving systems is an important issue and relevant research and development should be accomplished without delay. Making structures lighter is one way to save energy. The study of light metals such as aluminium and magnesium alloys has received much attention. Aluminium alloys are especially attractive because of superior recyclability and workability. However, present structures made of stainless steels cannot be entirely replaced with aluminium alloy structures, taking into account strength, weldability and economics, although it is possible to replace part of a structure with aluminium alloy components. In this case, it is necessary to joint SS 430F steel with aluminium 6061. Few sound joints have been obtained, owing to the formation of a large amount of brittle intermetallic compounds which were using fusion welding. In the recent years, welding of dissimilar metals by conventional welding techniques has become difficult. The flux used for the welding will create lot of heat which reduces the strength of the welded joints. In order to overcome this, friction welding is more effective in joining dissimilar metals when compared with fusion welding, since it is a solid-state process. Heat is generated in friction welding by conversion of mechanical energy into thermal energy in the interface of work pieces during rotation under pressure. Various ferrous and non-ferrous alloys having circular or non-circular cross sections and that have different thermal and mechanical properties which can be joined by the friction welding. Conventional structures made of steel have been replaced by lighter materials, capable of providing high mechanical strength, lower volume of material and good corrosion resistance components such as those used in industries (shipbuilding, light and heavy automotive, electrical, chemical, civil, space and nuclear industry).