Studying the Effect of Friction Welding Parameters on the Hardness Values Distribution of Al-Cu Joint

Abstract

This research depends on studying the connected of similar metals (Al-Al, Cu-Cu) and dissimilar metals (Al-Cu) by friction welding. Welding friction parameters that studied were friction time at range (3-31) sec, friction pressure at range (20, 40, 60) MPa ,forging pressure at range (70,100,130) MPa and constant revolution of (2000) r.p.m.were studied by (17) samples. The welded parts were tested by tensile strength test, hardness (HV) test and liquid penetration test. The results showed that the hardness of welding zone was higher in values than both of (HAZ) zone and base metal zone due to the occur of recrystallization process due to the generated heat during welding process, also the tensile strength of welded zone was higher (500 MPa) due to the activation of diffusion process at welding zone which depends on the heating generated during welding process, It is   also found that the decreasing in the length ( ) of aluminum is more than that of copper because the hardness of aluminum (32Hv) is less than that of copper (60Hv). Also from the results, it was found that weldabilty of similar metal (Al-Al), (Cu-Cu), were improved using the friction welding process due to a good tensile strength.