Study on Application of Undermatched Welds for UTS 490N/mm2 Class Steels
Akira UMEKUNI, Kohsuke HORIKAWA, You-Chul KIM
This paper presents experimental and numerical studies on the effects of undermatched welds with very low Si and Mn welding wires using GMAW process on 490N/mm2 class steels. Undermatched welds prevent cold cracking without preheating. The results of CTOD and fatigue tests of welded joints shows that the strength of welds influenced the characteristics of fracture toughness and fatigue strength. The results indicates lower strength of welds provided higher fracture toughness and fatigue life (Nf).