Effects of gas compositions on mechanical properties of MIG/MAG welded automobile

MIG/MAG welding processes have recently become more significant in automotive body production. MAG welded automobile body which manufactured using different shielding gas combinations come across the mechanical stresses especially dynamic stresses when running road. In this study, FeP04 (St 14) type automobile body sheet has been MAG welded using welding process with diffirent shielding gas combinations and then mechanical properties of joints have been investigated. Visual inspection has been applied to welded sheets and then tensile test, bending test, fatigue test, metallografic examination and hardness distribution have been carried out specimens respectively. As a result, effect of gas combinations can the mechanical properties of joints has been examined and also some suggestions have been given to automobile body manufactures. Science Code : Key Words rAutomobile body, MIG/MAG welding, shielding gases, fatigue, hardness