Welding Deformation Characteristics and Mitigation Method of Hub Flange

This paper considers a 3-D thermos-mechanical analysis to investigate the effect of welding direction, tack weld, root gap and process on deformation in hub flange pipe joint. Multi-pass for single ‘V’ butt-weld joint geometry is simulated weld path used with realistic bead. 3 different direction (2-path, 4-path diagonally, from bottom) are analyzed how presence or absence affects was analyzed. Also, cases gaps (2, 3, 4mm) considered finite element results compared. In addition, effects face determined. From results, perpendicularity found be strongly dependent welds. On other hand, has small influence tilting. The also showed feasibility mitigating controlling deformation, optimum selection method confirmed.