izvorni znanstveni rad
Residual stresses have a significant effect on the durability and fracture behavior of welded structures, as well as on their dimensional stability and durability, and it is very important to carefully control the welding parameters and cooling rate to reduce the generation of residual stresses during welding. In this paper, two pairs of aluminum alloy 5083 plates were butt welded using the AC and DC MIG welding process. Residual stresses were measured using the non-destructive X-ray diffraction method based on the cosα method. The measurement points were electropolished before measurement to remove the surface layer of the metal. The stress distribution was achieved in such a way that tensile residual stresses occur near the weld in the heat-affected zone, while compressive stresses prevail in the zone of the base material at some distance from the weld. Analysis of the results shows that more favorable residual stress results are obtained with alternating current because it achieves lower tensile stresses values then direct current in the heat-affected zone, which are much more problematic in the context of welding than compressive stresses in the base material.
AC MIG, Butt joint, X-ray diffraction, XRD, Residual stresses, cosα method
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