Full-position connecting pipe and safety end circular seam welding method achieved through tungsten electrode inert gas arc welding

Abstract

The invention discloses a full-position connecting pipe and safety end circular seam welding method achieved through tungsten electrode inert gas arc welding. According to the method, nickel base alloy serves as an isolating layer to carry out machining on a connecting pipe and a safety end so that a welding groove can be formed by the connecting pipe and the safety end during assembling, and the welding groove is welded. A plurality of weld beads are welded during welding, the bottom end of a part to be welded is arced during welding, spin welding is carried out along one side of the part to be welded to the top end of the part to be welded, arcing is stopped, the bottom end of the part to be welded is arced again, spin welding is carried out along the other side of the part to be welded to the top end of the part to be welded, and arcing is stopped. When the welding groove is a double-faced U-shaped narrow gap groove, an outer groove is welded but not completely welded, back chipping and complete welding are carried out on an inner groove, and then complete welding is carried out on the outer groove. When the welding groove is a single-faced narrow gap groove, the groove is completely welded, a cushion plate is removed, and back chipping is carried out.

Description

technical field [0001] The invention relates to full-position narrow-gap groove welding performed when the connecting pipe and the safety end are axially and horizontally fixed by using nickel-based alloy filling materials, and specifically relates to a welding method for full-position tungsten inert gas shielded welding of the connecting pipe and the safety end annular seam . Background technique [0002] The main equipment of the nuclear island, the steam generator, and other products are designed with welded joints and safety end ring seams. At present, automatic TIG welding methods are mainly used in China for welding such welds in the flat welding or horizontal welding positions, while nickel-based alloy filler materials are used. Welding the connecting pipe and the safety end at the 5G full position where the axial and horizontal fixing of the connecting pipe is fixed has not been applied before, mainly because the welding of nickel-based alloy materials has a high the...

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Problems solved by technology

[0002] The main equipment of the nuclear island, the steam generator, and other products are designed with welded joints and safety end ring seams. At present, automatic TIG welding methods are mainly used in China for welding such welds in the flat welding or horizontal welding positions, while nickel-based alloy filler materials are used. Welding the nozzle and the safety end at the 5G full position where the nozzle is axially and horizontally fixed has not been applied before, mainly because the welding of nickel-based alloy materials has high thermal crack sensitivity and the welding process is prone to defects such as incomplete fusion. On the other hand, it is very difficult to obtain good weld formation and stable welding quality for 5G all-position welding with axial and horizontal fixed pipes

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