Effect of the electrode to work angle, filler diameter and shielding gas type on weld geometry of HQ130 steel joints produced by robotic GMAW

Abstract

GMAW (Gas Metal Arc Welding) is an arc welding process which is widely used in industry to join the metals. We investigated the effect of varying welding parameters on the bead geometry in robotic GMA welds of HQ130 steel having 5 mm thickness. The chosen parameters for this study were the electrode to work angle (Φ), filler diameter (d) and shielding gas type (S.G). Different samples obtained by employing electrode to work angle of 65°, 75° and 85°, filler diameter of 0.8, 1, 1.2 mm. The main recommended gases for this filler material type were Ar, He and CO2 gas. Having finished the welding process, the depths of penetration were measured for specimens and the relationship between parameters and penetration of weld were studied. The results clearly illustrated that increasing of electrode to work angle increases the depth of penetration while increasing in filler diameter results in decreasing the weld penetration. In addition, the highest penetration was observed for CO2 shielding gas