A stainless steel composite nickel material welding process

Abstract

The invention discloses a stainless steel composite nickel material welding process, which is characterized in that: the steps are: (1) Groove processing: the test piece adopts a double-sided groove, the outer groove adopts a V-shaped groove, and the inner groove adopts a U-shaped groove ;(2) Groove cleaning and inspection: first thoroughly clean the base metal groove and the impurities and dirt within 20mm on both sides, and check the groove; (3) Base layer welding: use argon arc welding wire Arc welding bottoming welding, single-sided welding and double-sided forming, avoiding root cleaning on the back; (4) Filling of the outer opening of the base layer and welding of the cover layer: welding is carried out by welding wire submerged arc welding technology, and 100% penetration and cleaning of the weld seam after welding 100% radiographic inspection; (5) Welding of multi-layer transition layer: After the basic inspection is qualified, the transition layer is welded with argon arc welding wire, and 100% penetration inspection is performed on the transition layer; (6) Multi-layer corrosion-resistant layer welding: transition layer inspection After qualified, the corrosion-resistant layer is welded with 3×3mm plate as argon arc welding wire, and 100% penetration test is done after welding.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a stainless steel composite nickel material welding process. Background technique [0002] The base material of the equipment reactor of the tetrachlorethylene project is S30409 composite NO2201 (δ32+8mm), the working temperature in the equipment is as high as 585°C, and the medium is CHCL3, CCL4, C2CL4, CL2, HCL, etc. and heavy components. The medium is highly corrosive when exposed to water, and has high requirements on the corrosion resistance of the base material, and ordinary stainless steel cannot meet the corrosion requirements. [0003] Pure nickel has excellent corrosion resistance, good mechanical properties, high heat resistance and special electrical, magnetic and thermal expansion properties, especially at high temperatures can maintain excellent thermal stability and thermal strength, therefore, they can be used in Work for a long time under high temperature oxidi...

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the problems existing in the prior art, and provides a stainless steel clad nickel material welding process. The groove of the process adopts a double-sided groove, and the outer groove adopts a V-shaped groove, which reduces the filling area of ​​the base weld metal. The amount of welding consumables is reduced, and the production cost is reduced; the U-shaped groove is adopted in the inner mouth, which ensures the width of the weld seam at the root of the transition layer, avoids welding defects such as infusion and incomplete penetration due to poor fluidity and shallow weld penetration, and ensures Welding quality, multi-layer welding uses nickel plate as filler wire, which effectively guarantees the corrosion resistance of the deposited metal

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