OPTIMIZATION OF WELD PENETRATION PROBLEM IN BUTT WELDED JOINTS USING STRESS CONCENTRATION FACTORS AND STRESS INTENSITY FACTORS

摘要

One of the imperfections in butt welds is referred as the lack of penetration (LOP). Lack of penetration occurs due to weld metal fails to reach the root of the joint which is inevitable considering both the cost of the edge preparation and machining time into account. The LOP may act as a crack when it is subjected to loading. States of stress at these highly stress concentration regions are evaluated by two important fracture parameters namely stress concentration factor (SCF) and stress intensity factor (SIF) using FEA. The SIF & SCF are evaluated at lack of penetration defects for double-V, single-V, double-J, and single-J butt welded joints subjected to axial loading with varying defect length (LOP) to plate thickness ratios to find an acceptable defect length. Few comparisons are made with the previous existing experimental results. Hence Present work becomes the first approach for approximation of typical weld penetration defects.