Combined connection method for backing welding of dissimilar materials

The invention relates to the technical field of welding, and particularly discloses a combined connection method for backing welding of dissimilar materials. The combined connection method comprises the steps that firstly, a set of welding materials are designed and prepared, the welding materials are matched with base materials connected with the welding materials, and the welding materials are matched; secondly, a proper heat source is selected, a corresponding cladding method is adopted for cladding, and a composite weld joint cladding layer is prepared; thirdly, a groove is designed and machined; and fourthly, a proper heat source is selected, a corresponding connection method is adopted for connection, and a composite weld joint connection layer is prepared. The combined connection method provided by the invention has the advantages of multiple selectable heat source types, efficient welding material and connection process design and development, good welding flexibility, high efficiency ...