Weldments with fillet joints submitted to “in-plane” quasi-static and impact torsion loads

This paper presents partial results of a broader research in progress involving fillet joints welded with Gas Metal Arc Welding and using consumables that produce weld metals with a large difference in ultimate tensile stress and ductility (classes AWS ER70S-6 e AWS ER120S-G). Therefore, two kinds of weldments were made with one of the members in “balance” and keeping welds with their original finish. One weldment was made with two weld beads transverse to the loading direction (“WT”) and the other with welds in a C shape, having beyond those two weld beads, another parallel to the loading direction, connecting them. Only those weldments made with AWS ER120S-G were loaded with and without preheating. Then, all weldments were submitted to “in-plane” quasi-static and structural impact torsional loads. Among the main results, the influence of the 150 °C preheating on the weldment with AWS ER120S-G electrode is highlighted, for apparently it also made the weldment more (“structurally”) ductile. With quasi-static loads and considering the “C” weld configuration, this preheating reduced around 13% the joint hardness and increased around 11% the weldment strength, when compared to other manufactured at room temperature. Preheating also increased around 7% the weldment strength to impact loading.