Welding method of dissimilar material pipes for advanced ultra-supercritical boiler

Abstract

The invention discloses a welding method of dissimilar material pipes for an advanced ultra-supercritical boiler, and belongs to the field of welding of the dissimilar material pipes for boilers. Thetechnical essentials of the welding method comprise the following steps: a, performing pre-welding preparation; b, preparing welding materials; c, pre-heating welding joints of two pipes; d, performing interlayer temperature control by adopting a way of spraying and cooling through a water cooling device in a welding process; and e, performing post-welding inspection: inspecting the welding jointsaccording to standard after welding is carried out. According to the welding method of the dissimilar material pipes for the advanced ultra-supercritical boiler disclosed by the invention, when the two dissimilar material pipes are welded, a nickel-based alloy is selected as a filling material, and the interlayer temperature control is carried out by adopting a way of spraying and cooling throughthe water cooling device in a hot-filament tungsten argon arc welding process, so that the welding efficiency cannot be affected when the welding quality is ensured at the same time; whether thermaltreatment is needed or not and how to choose post-welding thermal treatment regime after welding are determined according to chemical components, tissue mechanical performance and the like of materials, and the problem of welding of dissimilar materials among candidate materials for the advanced ultra-supercritical boiler is solved.

Description

Technical field: [0001] The invention relates to the field of processing dissimilar material pipes for advanced ultra-supercritical boilers, in particular to a welding method for dissimilar material pipes for advanced ultra-supercritical boilers. Background technique: [0002] Because solid solution strengthened nickel-based alloys, nickel-iron-based alloys, age-strengthened nickel-based alloys, martensitic heat-resistant steels and new austenitic stainless steels all have excellent high-temperature mechanical properties and corrosion resistance, they are often used as advanced super super Candidate materials for critical boilers. Among the components used in advanced ultra-supercritical boilers, there are often welding of small-diameter tubes of dissimilar materials using the above materials. However, due to the differences in chemical composition, mechanical properties and heat treatment methods of these materials, it is difficult to weld pipes of dissimilar materials. T...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a welding method of dissimilar material pipes for advanced ultra-supercritical boilers, which solves the difficult problem of welding candidate dissimilar materials for ultra-supercritical boilers, and at the same time, welding material selection and welding when welding other dissimilar material pipes Process control is of reference significance

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