Microstructure and Mechanical Properties of Friction Welding Aluminum Semi-Solid Casting 7075

Abstract

The purpose of this research was to investigate the factors affecting semi-solid aluminum
casting 7075. The welding experiments were carried out under three welding speeds as 450,
675 and 1000 rpm, and three welding pressure as 40, 50 and 60 bar, with emphasis effects
on macro and microstructure, hardness and tensile strength of welds. The results showed that
the fully deformed zone structure was fine grain at the combination of two metal pieces, which
had the same direction of grain arrangement because of the influence from the rotation of the
lathe. The strength was increased by the faster welding speed. The maximum tensile strength
was 244.6 MPa at a welding speed of 1000 rpm welding pressure of 60 bar. The efficiency of
received strength of the joints was approximately 107.3% comparing with base metal.