Three-wire gas metal arc welding method for dissimilar material connection

The invention relates to the technical field of welding, and particularly discloses a three-wire gas metal arc welding method for dissimilar material connection. The three-wire gas metal arc welding method comprises the following steps: firstly, designing and preparing a welding wire A and a welding wire B which are matched with a base metal A and a base metal B; secondly, a welding wire C matched with the welding wire A and the welding wire B is designed and prepared; thirdly, designing the form and the size of a groove; fourthly, the three welding wires are arranged at spatial positions; and fifthly, a three-wire welding mode and welding process parameters are set, single-layer welding or multi-layer welding is carried out, and the partitioned composite welding seam is formed. The welding method provided by the invention is good in welding flexibility, simple in process, high in welding efficiency, low in cost, efficient in welding wire design and development, good in composite welding seam partition, capab