Abstract Scope |
For high-productivity joining applications including thick-section joints and surface cladding, deposition rate is crucial. It is possible to use submerged arc welding for such applications, however for some materials is preferred to use gas metal arc welding (GMAW) since lower heat input can be achieved. Since the deposition rates using GMAW are not as high as for submerged arc welding, another alternative is to utilize cold-wire GMAW to increase deposition rate without significantly increasing heat input. The main reason for this is that the deposition and wire feed rate can become decoupled from the arc current, and the addition of a secondary wire can augment the heat efficiency of the process. The recent progress in applying cold-wire GMAW for thick-section welding and overlay applications will be discussed in this presentation, and include examples for carbon steel, stainless steel, and aluminum. |