Effect of welding current on chemical composition and microstructure of Fe-Cr-C deposits obtained by SMAW for abrasive and erosive wear conditions

Abstract

The effect of welding current on the chemical composition and microstructure of Fe-Cr-C deposits obtained by SMAW and used for working under abrasive and erosive wear conditions was evaluated. Chemical composition of the deposit without dilution was determined and microstructure of the deposits was obtained with and without dissolution. The dilution coefficient was determined based on the geometry of the deposits and the chemical composition of the deposits for different welding currents based on it. It is concluded that all the deposits respond to the AWS EFeCr-A4 designation, characterized by a high predominance of eutectic, being suitable for working in conditions of abrasive and erosive wear. As the current increases, the content of alloying elements decreases due to dilution. The deposit obtained with a 110 A current is considered more appropriate, because 90 A current has very little penetration, which makes adherence difficult.

Keywords

• desgaste
• recargue
• corriente de soldadura
• microestructura
• depósitos fe-cr-c
• smaw.