Gas metal arc weldability of 1.5 GPa grade martensitic steels

• Published in: Metals and materials international Vol. 24; no. 1; pp. 149 - 156
• Main Authors: Hwang, Insung, Yun, Hyeonsang, Kim, Dongcheol, Kang, Munjin, Kim, Young-Min
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.01.2018; Springer Nature B.V; 대한금속·재료학회
• Subjects: Arc welding; Beads; Carbon dioxide; Characterization and Evaluation of Materials; Chemistry and Materials Science; Direct current; Engineering Thermodynamics; Gases; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Martensitic stainless steels; Materials Science; Metallic Materials; Processes; Quality; Rare gases; Shielding; Solid Mechanics; Steel; Weldability; Welding machines; 재료공학; gas metal arc welding; tensile test; hardness test; 1.5 GPa martensitic steel; mechanical properties
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-017-7188-5

The gas metal arc weldability of 1.5 GPa grade martensitic (MART) steel was evaluated using both inverter direct current (DC) and DC pulse power type welders, under conditions of different welding currents, welding speeds, and shielding gasses. By investigating the bead appearance, tensile strength, and arc stability, it was determined that DC pulse power is better than inverter DC power for arc welding of 1.3 mm thick 1.5 GPa grade MART steel. Further, from the results of the weldability for various shielding gases, it was determined that mixed shielding gas is more effective for welding 1.5 GPa grade MART steel than is pure inert gas (Ar) or active (CO 2 ) gas. In the case of pure shielding gas, no sound bead was formed under any conditions. However, when the mixed shielding gas was used, sound and fine beads were obtained.