Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Welding method for preventing generation of granular ferrite in SA335-T/P92 steel weld heat affected zone

A SA335-T, bulk ferrite technology, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve the problem that P91 cannot meet the requirements of long-term safe operation, hidden dangers of safe operation of power stations, and long cycle and other problems, to achieve the effect of reducing stress corrosion sensitivity, eliminating welding residual stress and improving plasticity

Active Publication Date: 2017-05-31
SUZHOU NUCLEAR POWER RES INST +3
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the early 1990s, on the basis of extensive promotion of SA335-P91 steel, Japan found that when the operating temperature exceeds 600 °C, P91 can no longer meet the requirements for long-term safe operation.
However, this method has a long cycle and high cost, and the long-term use of T / P92 steel high-temperature and high-pressure equipment with low high-temperature performance will bring major hidden dangers to the safe operation of the power station.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Welding method for preventing generation of granular ferrite in SA335-T/P92 steel weld heat affected zone
  • Welding method for preventing generation of granular ferrite in SA335-T/P92 steel weld heat affected zone
  • Welding method for preventing generation of granular ferrite in SA335-T/P92 steel weld heat affected zone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present embodiment provides a kind of welding method that prevents SA335-T / P92 steel weld seam from heat-affected massive ferrite to produce, and it comprises the following steps:

[0028] (a) The material is T / P92 steel (specification ) and Super304H (Specification Process it into a wall thickness of 6.8mm before welding) Make grooves between the end faces of dissimilar steels;

[0029] (b) Carry out argon arc welding without preheating of the root layer, and then weld layer by layer until the weld is formed; welding parameters are shown in Table 1;

[0030] Welding parameters in table 1 embodiment 1

[0031] Process content Parameter requirements Groove V-shaped groove, the groove angle is 50° on one side pre-heat temperature no warm-up Welding current 160A arc voltage 16V interlayer temperature 150～200℃ welding speed 60~80mm / min Protective gas pure argon shielding gas flow 10-20L / min

[003...

Embodiment 2

[0034] This embodiment provides a welding method for preventing the SA335-T / P92 steel weld seam from being affected by the blocky ferrite produced by heat. Its specific operation steps and operating parameters are consistent with those in Embodiment 1. The difference is that the material is T / P92 steel (specification ) and HR3C (Specification Process it into a wall thickness of 6.8mm before welding) for welding; the metallographic structure of the heat-affected zone on the T / P92 side of the final welded product is as follows image 3 shown.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a melding method for preventing the generation of granular ferrite in an SA335-T / P92 steel weld heat affected zone. The method comprises the following steps: (a) fabricating a groove between to-be-welded SA335-T / P92 steel end faces or between the to-be-welded SA335-T / P92 steel end faces and dissimilar steel, (b) performing non-preheating argon arc welding on a root bottom layer, and then performing welding layer by layer until a seam is formed, wherein the welding current is 130-160A, the arc voltage is 15-17V, and the interlayer temperature is 150-200 DEG C; and performing heat treatment after cooling. Therefore, the granular ferrite is not generated in the T / P92 steel weld heat affected zone; and moreover, the tissues can be improved, the plasticity of the seam is improved, the oxygen can escape, the residual welding stress is eliminated, the stress corrosion susceptibility is reduced, and the heat affected zone is softened.

Description

technical field [0001] The invention belongs to the technical field of welding, and relates to a welding method for preventing the generation of blocky ferrite affected by the heat of weld seams of SA335-T / P92 steel. Background technique [0002] In the early 1990s, on the basis of extensive promotion of SA335-P91 steel, Japan found that when the service temperature exceeds 600 °C, P91 can no longer meet the requirements for long-term safe operation. On the basis of P91, Japan developed T / P92 steel through the following improvements: by adding 1.5% to 2.0% W on the basis of P91 steel, the Mo content was reduced to adjust the balance between ferrite and austenite elements . [0003] T / P92 is mainly used to replace stainless steel in superheaters and reheaters in power plant boilers, as well as headers and steam pipes under extremely severe steam conditions. T / P92 has stronger high temperature strength and creep properties than other ferritic alloy steels. Its corrosion res...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/235B23K9/095B23K9/16B23K103/04
CPCB23K9/095B23K9/16B23K9/235B23K2103/04
Inventor 薛建强成鹏王志刚尹少华金敏华尚建路薛军王淦刚
Owner SUZHOU NUCLEAR POWER RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com