The present invention relates to the technical field of
boiler tube welding, and in particular to a method for
butt welding of boiler tubes, comprising the following steps: S1, pre-treating the ends and outer surfaces of the boiler tubes to be welded by a dry-wet alternating cleaning method, wherein the process includes first dry brushing, then wiping with
acetone, then
polishing with
sandpaper, and finally cleaning with a chamois cloth; S2,
processing a zigzag composite groove; S3, positioning the
boiler tube group; S4, preheating the boiler tubes by surrounding them with a spiral
flame; S5, performing a base
welding and a filler
welding by a double-arc alternating interrupted
arc welding method during welding; S6, after the filler welding is completed, performing a cover welding; S7, after the cover welding is completed, completing interlayer cleaning of the weld layer by knocking and vibrating; S8, wrapping the final weld with multiple
layers of wet towels for insulation and
slow cooling, and inspecting the welds after cooling. The method is compatible with conventional equipment, does not require special tooling, can meet the needs of small-
space operations with multiple rows of boiler tubes, and has a low threshold for welding, low difficulty, and is suitable for welders to quickly master.