Parameters identification for weld quality, strength and fatigue life enhancement on HSLA (S460G2+M) using manual GMAW followed by HFMI/PIT / Dahia Andud... [et al.]

This research is aimed to identify suitable parameters in achieving weld quality, strength and fatigue life enhancement for structural welding. The investigated material is High Strength Low Alloy Steel S460G2+M commonly used for harsh environment such as offshore structure or platform. Due to the extensive use in fabrication industry, the selected welding process is manual GMAW with filler wire ER80S-Ni1 and shielding gas 80%Ar + 20% CO2. The research initiates with the determination of suitable welding parameters such as Current, Voltage, welding speed etc. to attain good quality which refers to international welding standards AWS D1.1/D1.1M:2015. Further, the parameters of HFMI/PIT are to be investigated starting with the comparison of strength between untreated and treated tensile fatigue specimen. As the final results, the development of a conceptual WPS and PQR including HFMI/PIT-Procedure as an integrated model with regard to structural and fatigue life enhancement is presented for production purpose and for further use on application which is identical to this research.