Influence of shot peening on bending forces for MIG dissimilar welding joint aluminum alloys

Abstract

In this paper, the influence of MIG welding method was investigated on bending quality for two aluminum alloys (2024-T3 and 6061-T6) which were joint together and metal inert gas (MIG) has been implemented on plate to get butt joints weldments in dimensions of (200 x 50 x 10) mm, a ready angle of 60 ° in V shape and square weld joint. The symbol of filler metal is ER-4043(Al-Si5), and argon has been used as a shield gas. The welded joints were exposed to X-ray radiography and faulty pieces were expected Welding joint were exposed to heat treatment in the furnace up to 190 °C for an hour then the test specimens were cooled by air to relieve welding stress. Welded and base specimens were machined into dimensions agreeing to the ASTM (E 190-92) bending standard. number of these specimens were exposed to a shot peening technique at a time (15) minutes using steel ball at a diameter of 1.25 mm. microstructure examination and Vickers hardness test were carry out. Results show a general decay in bending qualities of MIG weld joint compared with unwedded joints, and in the disparate joint unite with original metal due to the change of the microstructure during the welding process. Shot peening contributed to improving the bending strength of V and square weld joints with a percentage of 48% and 71 %, respectively.