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Abstract
Ferritic stainless steels have been extensively used in automotive exhaust systems. Ferritic stainless steel wires have been recently introduced in the fabrication of these components to reduce costs (hot and cold parts) and improve the quality of hot part components, mainly thermo-mechanical fatigue resistance, and their use has been growing since. This study compares mechanical and metallurgical characteristics of fusion zones obtained with 430Ti and 430LNb welding wires. The influence of Ar 2%O2 and Ar 2%N2 3%CO2 shielding gases was also studied. Metallographic analysis was performed by optical and electronic microscopy, revealing the main characteristics of the fusion zone obtained with these welding wires and shielding gases. Welded joint ductility was measured using the Erichsen test. The results indicated that ferritic stainless steel wires could be used to produce welds with adequate ductility. However, this depends critically on the choice of the welding wire and the shielding gas to maximize mechanical and metallurgical properties and to avoid any future problems.
