Novel welding process method for ocean engineering square tube structure prefabricated welding joint

The invention discloses a novel welding process method for a prefabricated welding joint of an ocean engineering square tube structure. The novel welding process method comprises the following steps that a plate is blanked, and the edge to be welded of the plate is subjected to groove machining; assembling the plate welding joints to form a prefabricated square tube structure welding joint; a metal powder core welding wire is adopted, and semi-automatic gas shielded welding is used for conducting bottom sealing welding on the welding joint position; a flux-cored wire is adopted, and semi-automatic gas shielded welding is used for conducting filling welding on the position of a welding joint; and a flux-cored wire is adopted, and semi-automatic gas shielded welding is used for conducting cosmetic welding at the position of a welding joint. The marine engineering square tube structure prefabricated welding joint can be welded, the welding effect is good, and welding operation is easy and convenient. 本发明公开了一种海洋工