The paper analyzes the effects of the geometric shapes of the weld seam cross section of the overlapped fillet welded plates , on the bearing capacity of the welded joint, as assessed by the stress relief factor kt
This analysis is done with the Finite Element Method. The study treats the optimization of welded seam geometry of fillet welded overlapped plates by reducing the stress relief factor, and analyzing its variation in different forms of cross section of the weld, namely:a) level polished surface; b) convex surface; c) polished concave surface.
It is noted that, in all options considered, the geometrical shapes of welding seams of fillet welded overlapped plates, with polished concave surface, gives a superior bearing capacity compared with the polished convex surface on the plausibility field of variation of the dimensional parameters hCVX and hCAV for plates with wall thickness s.
For concave shapes of welding seams of fillet welded overlapped plates to identify two areas having a local stress relief, located in A zone of the cross section of the HAZ of the base material at the bottom of the fillet welded seam and B zone, on the transverse closing contour of the blank between the two overlapped plates.
In all analyzed cases this factor is significantly lower than the values comply with the fillet welded seams with polished convex surface.