Effect of Transformation Expansion on Restraint Stress of Weldment in Relation to Cold Cracking of High Strength Steels(Materials, Metallurgy & Weldability)

概要

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The effects of the transformation expansion on the restraint stress in root pass welded joint of various strength steels of SM41, HT60, HT80, HY130 and HY150 were quantitatively investigated using the RRC test by GTA welding with filler wire. Consequently, final values of the restraint stress decreased with an increase in strength levels of base steel, namely in the order of SM41, HT60, HT80, HY130 and HY150. For example, the final restraint stresses in SM41, HY130 and HY150 were about 50, 22 and 15kgf/mm^2, respectively, in restraint intensity of 1000kgf/mm・mm. Moreover it was revealed that the final restraint stress decreased approximately linearly as transformation expansion of welded joint obtained by dilatometric technique. Additionally from this investigation, it was suggested that the transformation temperatures of HAZ and weld metals also related to reducing final restraint stress.
大阪大学の論文