Experimental Study on Welded Joints of Dissimilar Strength Steels at the Corner Portion of Butt Welding between Cold-Formed Square Hollow Section Tube and Through-Diaphragm

Abstract

This paper describes an experimental survey for the corner portion of the butt welding joints between through diaphragm-to-cold-formed square hollow section tube.The strength of the tube's steel tends to be increased due to cold working at the corner portion; that may lead to undesirable fracture of the through diaphragm plate, whose strength becomes lower than those of the tube. Tensile and bending tests were carried out for the cruciform joint with CJP weld to verify the strength and fracture behavior. On the premise of the effect of the protrusion of through diaphragm, the test results show that the joint's fracture behavior can be explained by the height of the reinforcement metal and strength ratio of the diaphragm-to-the column tube.