METHOD FOR GAS METAL ARC WELDING (GMAW) OF NITRIDED STEEL COMPONENTS USING CORED WELDING WIRE

摘要

A method for gas metal arc welding a first component formed of nitrided steel to a second component with reduced porosity in the weld is provided. A welding wire including a core surrounded by a tube is used to weld the components. The material of the core is formed of mild steel including 0.7 to 3.0 wt. % aluminum and 0.7 to 1.5 wt. % titanium. The material of the tube is formed entirely of low carbon steel. During the weld process, the nitrogen from the nitrided steel combines with the aluminum and titanium of the welding wire to form aluminum nitride and titanium nitride, instead of nitrogen bubbles which lead to high porosity. The method can be used to weld components used in automotive applications, for example to weld a ring gear and can of a flexplate, but alternatively could be used for another automotive or non-automotive applications.

主权项

1. A method for welding components, comprising the steps of:
disposing a first component formed of nitrided steel along a second component to present a joint therebetween; forming an electric arc between a welding wire and the joint; the step of forming the electric arc between the welding wire and the joint including transferring material of the welding wire to the joint and melting at least a portion of each component with the material of the welding wire to form a weld along the joint, wherein the material of the welding wire is iron-based and includes aluminum and/or titanium.