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

Method for improving post-welding comprehensive performance of large-diameter thin-wall duplex stainless steel joint

A technology of duplex stainless steel with comprehensive performance, applied in welding equipment, plasma welding equipment, metal processing equipment, etc., can solve the problems of insufficient welding performance of large-diameter thin-walled duplex stainless steel pipes, collapse and deformation of heat-treated welded pipes, etc., and achieve excellent comprehensive performance performance, reduction of finishing processes, and cost reduction effects

Pending Publication Date: 2021-11-19
中钢不锈钢管业科技山西有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and solve the technical problems of insufficient welding performance of large-diameter thin-walled duplex stainless steel pipes and the collapse and deformation of heat-treated welded pipes. The present invention provides a method for improving the comprehensive performance of large-diameter thin-walled duplex stainless steel joints after welding method

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The 2205 duplex stainless steel deformed by crimping is used as the base material, and the material size parameter is 6000mm (length) × 8mm (thickness) × 1200mm (diameter), and the circularity of the material is ensured by the bending process before welding.

[0028] A method for improving the comprehensive performance of large-diameter thin-walled duplex stainless steel joints after welding, comprising the following steps:

[0029] S1. Welding:

[0030] S1-1. The duplex stainless steel plate to be welded is pre-welded. The welding groove is designed as a Y-shaped groove, the blunt edge is 1.75mm, and the single-side groove angle is 30°. Before welding, the welding is cleaned by mechanical grinding. End face and nearby areas: Use an angle grinder to remove scale, burrs and other defects in the groove and nearby areas, use sandpaper and rags to remove oil and water quality, ensure the cleanliness of the welding position, and save it for later use;

[0031] S1-2. Bending...

Embodiment 2

[0045] The 2205 duplex stainless steel deformed by crimping is used as the base material, and the material size parameter is 6000mm (length) × 5mm (thickness) × 800mm (diameter), and the circularity of the material is ensured by the bending process before welding.

[0046] A method for improving the comprehensive performance of large-diameter thin-walled duplex stainless steel joints after welding, comprising the following steps:

[0047] S1. Welding:

[0048] S1-1. Perform pre-welding treatment on the duplex stainless steel plate to be welded. The welding groove is designed as a Y-shaped groove, the blunt edge is 2.25mm, and the single-side groove angle is 32°. Before welding, the welding is cleaned by mechanical grinding. End face and nearby areas: Use an angle grinder to remove scale, burrs and other defects in the groove and nearby areas, use sandpaper and rags to remove oil and water quality, ensure the cleanliness of the welding position, and save it for later use;

[0...

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

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Lengthaaaaaaaaaa
Strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for improving post-welding comprehensive performance of a large-diameter thin-wall duplex stainless steel joint, belongs to the technical field of welding, and solves the technical problems that the welding state performance of a large-diameter thin-wall duplex stainless steel pipe is insufficient, and a heat treatment state welded pipe collapses and deforms. The method comprises the following steps that firstly, welding process regulation and control are carried out, in the welding process, welding heat input is strictly controlled according to the characteristics of a dual-phase steel material, and sigma phase precipitation is reduced; and secondly, heat treatment process regulation and control are carried out, the relative content of alpha / gamma phases is regulated and controlled, the harmful sigma phase is eliminated, meanwhile, the stress distribution rule of a welded pipe is calculated and analyzed, an auxiliary device for preventing deformation of the welded pipe in the heat treatment process is assembled in the pipe, the obtained welded pipe has excellent comprehensive performance and does not have obvious collapse deformation, the subsequent finishing procedure is obviously reduced, and the product performance is greatly improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a method for improving the comprehensive performance of a large-caliber thin-wall duplex stainless steel joint after welding. Background technique [0002] Duplex stainless steel is an important high-strength, corrosion-resistant engineering structural material. Its structure is mainly composed of ferrite phase and austenite phase. The comprehensive performance of duplex stainless steel is improved by reducing C and increasing N. , especially the strength, fatigue performance and anti-sensitization performance have been significantly improved. [0003] Duplex stainless steel joints generally undergo solution treatment, and the sigma phase produced by welding is eliminated through a reasonable post-weld heat treatment process, thereby improving the strength and grain boundary corrosion resistance of the joint. However, heat treatment will change the ratio of α / γ phas...

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
IPC IPC(8): B23P15/00B23K10/02
CPCB23P15/00B23K10/02
Inventor 邬莉华李亚杰李岩党淑娥魏晓晋邢海元慕振红
Owner 中钢不锈钢管业科技山西有限公司
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