Switch Back Technique for the Increase of the Production in the Angle Welding between Plates of Dissimilar Thicknesses

Abstract

Angle welding of structural components with dissimilar thickness by traditional, manual or automatics, welding procedures can show lack of penetration, undercut and perforations. The occurrence of these defects must be the incorrect use of the welding current and the lack of robustness of the welding procedure among the geometrical irregularity possibilities in the joints. In addition, the depth of the undercut and the quantity of the perforations are enlarged when the increase of the production is wanted. This occurs due the electrical power increment from the arc to keep constant the quantity of the material in the welding joint to get higher the welding speed. This work apply the longitudinal oscillation from the welding torch known on the literature as switch back, to increase the production with quality in welding. Were used trajectories of the type linear conventional and switch back of three steps with constant and variable torch velocity (forward velocity four times faster than the return). The weld seams approval standard was based in the welding ISO. The results showed a non-significant increase of the production with the technique switch back of the type constant speed from the torch.

Key-words:
GMAW; Mechanization welding; Joint in angle; Robust procedure; Switch back