Effect of flame straightening treatment on the microstructure of fillet weld S355J2+N steel

Abstract

Flame straightening is the most common method applied in welded steel to mitigate distortion. This research showed that flame straightening can be safely applied on fillet T-joint S355J2+N steel. The microstructure and hardness on the back surface of the fillet T-joint were affected by the flame straightening process. The surface experienced a decrease in hardness and changes in the shape and size of the microstructure. In this research, the welding procedure standard (WPS) was applied to the welding test coupon. The straightening process was then applied on the back surface of the fillet T-joint by heating and then cooling rapidly with an air jet. Lastly, microstructure investigation and hardness test were performed on the flame-straightened area.

Keywords

• S355J2+N
• fillet weld
• flame straightening
• microstructure
• hardness