The robot mag surfacing process of the corrosion-resistant layer of the inlet and outlet of the pressure vessel of the civilian nuclear reactor

Abstract

The invention provides a robot MAG overlay welding process for a civil nuclear reactor pressure vessel access adapter pipe anti-corrosion layer. The robot MAG overlay welding process for the civil nuclear reactor pressure vessel access adapter pipe anti-corrosion layer comprises the steps of welding at least two welding layers, adopting low alloy steel as base metal and a welding material as austenitic stainless steel, providing a tail drag protection gas hood for a welding gun, providing a protection gas for the tail drag protection gas hood, and enabling to eh protection gas to cover a welding pass adjacent to a molten pool, wherein the protection gas is He+CO2+Ar, and the dilution rate is controlled to be smaller than 27 percent. According to the robot MAG overlay welding process provided by the invention, an overlay welding layer has no defects such as air holes, microcracks, and incomplete fusion between passes.

Description

technical field [0001] The invention relates to a welding process, in particular to a surfacing welding process for civil and nuclear reactor pressure vessels. Background technique [0002] At present, the surfacing welding of the saddle-shaped end face corrosion-resistant layer of the reactor pressure vessel inlet and outlet of the main equipment of the domestic nuclear island is mainly performed by manual electrode arc welding. There is no public literature about the application of robotic MAG (melting electrode arc welding) surfacing welding technology in the civil nuclear field. On the one hand, manual electrode arc welding has low welding efficiency, and on the other hand, the stability of weld quality is poor. [0003] The MAG surfacing process has been applied in non-civilian nuclear fields, but its welding quality requirements are lower than those in civil nuclear fields, so it cannot be directly applied to civil nuclear fields. [0004] In practice, the inventor f...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide the MAG surfacing welding process of the corrosion-resistant layer robot for the inlet and outlet of the civil nuclear reactor pressure vessel, which can replace the current manual arc welding used in the saddle-shaped end face corrosion-resistant layer surfacing, overcome the aforementioned welding quality problems and improve welding efficiency

Images