1987 Volume 73 Issue 8 Pages 1018-1025
The effects of metallurgical factors such as elongated inclusions, microstructure, and hardness across the welded interface on the toughness of flash welded joint were studied.
As upset distance increased, microstructure changed from bainitic ferrite to fine polygonal ferrite, and Charpy impact properties such as vTre and vEs of welded joint deteriorated remarkably. This deterioration was mainly caused by the elongated inclusions which were affected by the inclusions in base metal and upset distance. The effects of microstructure, hardness and (200) texture at the welded joint on the toughness were smaller than the effect of inclusion.
It was concluded that the decrease of inclusion in base metal and the decrease of hardness of welded joint by the control of upset distance were essential for the improvement of toughness of welded joint.