Microstructural and mechanical properties of dual-phase steels welded using GMAW with solid and flux-cored welding wires

✍ Scribed by Hayat, Fatih; Uzun, Hüseyin

• Book ID: 124051165
• Publisher: Carl Hanser Verlag
• Year: 2012
• Tongue: English
• Weight: 934 KB
• Volume: 103
• Category: Article
• ISSN: 1862-5282
• DOI: 10.3139/146.110702

✦ Synopsis

Abstract

The aim of this study is to demonstrate the transformation of grade-A steel into dual-phase steel by heat treatment, and the joint performance of dual-phase steels welded by means of the gas metal arc welding process using both solid and flux-cored welding wires. Dual-phase steels with different contents of martensite were obtained by intercritical annealing in different temperature ranges of a grade-A shipbuilding steel, followed by water quenching. The experimental results revealed that the tensile strength of the dual-phase steels joined by solid wire is higher than that of the flux-cored wire joints. The microstructure of grade-A steel consists of ferrite and pearlite, while the dual-phase steels consist of ferrite and martensite. On the other hand, while the martensitic phase is especially encountered in the weld metal of the dual-phase steels joined with the solid wire, the ferrite phase is more common in the weld metal of the flux-cored wire joints.