Influence of Surface Treatment on Mechanical Properties of Pressure Welds

Abstract

Surface treatment of the interface to be welded is one of the most important factors affecting the weld characteristics especially in the pressure welding such as solid phase welding.
The purpose of this study is to investigate the influences of the surface treatment technique and interval of time between the surface finishing and welding upon the mechanical properties of the pressure welds of aluminium alloys, copper and carbon steels. The following results were obtained.
1. Filing away surface treating gave higher weld strength characteristics than wire and emery polishing, and was as effective as the fricative scratch treating of the intimate surface each other.
2. Increase of exposure time between the surface finishing and welding decreased the ductility rather than the tensile strength of the welds.
3. Maximum strength of the welds of cold working material such as aluminium and copper was obtained by making at the recrystallization temperature of the metal.
4. When the welding temperature was chosen at low temperature of 200-300°C, the pressure weldability of alclad 24S-T3 was better than that of 24S-T3, therefore it is expected that welding temperature can be lowered by the method with the incert metal.