Validação da qualificação de procedimento de soldagem para arecomposição de metal base SAE-4140 de eixos de propulsores dosegmento naval

Abstract

It is common in the mechanical forming industry (as long as previously agreed with the customer) to repair by welding non-conforming parts. This work show welding technical documentation (WPS and SWPS), elaborated by a forging factory, to cover propeller shafts shrink hole from the forging process. This work aims to discuss the welding procedures developed in order to to validate its effectiveness and to guarantee the standardization and repeatability of the welding process. For the qualification of the welding procedures two plates test specimens were welded using the SMAW process. Because of base metal (SAE-4140) is a low alloy steel the electrode ER11018G was selected based on the mechanical properties. After welding the pieces were quenched, tempered and subjected to ultrasonic and magnetic particle tests. Following the plates were machined and cut for samples removal (macrography, hardness, tension, bend test and Charpy impact test)The results found show that the welding procedures (WPS) and their respective registers (SWPS) are able to guarantee that the reworked products get the properties required for application.