Residual stress study of welded high strength steel thin-walled plate-to-plate joints, Part 1: Experimental study: Fid-Bau Portal

Residual stress study of welded high strength steel thin-walled plate-to-plate joints, Part 1: Experimental study

Lee, C.K. / Chiew, S.P. / Jiang, Jin

Abstract In this study, an investigation on the residual stress distributions near the weld toe of high strength steel thin-walled plate-to-plate T and Y-joints is carried out. Two groups of specimens, corresponding to welding preformed at ambient temperature and at a preheating temperature of 100°C, are fabricated. The effects of preheating and joint geometry on the residual stress distribution near the weld toe are investigated by using the ASTM hole-drilling method. Furthermore, a study is also performed to evaluate the influence of brace plate cutting on the residual stress distribution near the weld toe of the joints. Experimental results obtained shown that tensile residual stress up to one third of the yield strength could appear near the weld toe and its value increases as the plate thickness and intersection angle increase. Furthermore, preheating was found to be an effective way to reduce the magnitude of residual stress while brace plate cutting could release the residual stress along the weld toes significantly.

Highlights ► A study on residual stress distribution of high strength steel plate-to-plate joint. ► A study on the effect of preheating and brace plate cutting on residual stress. ► Tensile residual stress up to one third of yield strength could appear at weld toe. ► Preheating is an effective way to reduce residual stress at weld toe. ► Brace plate cutting could release the residual stress significantly at weld toe.