Welding Process and Difficulty Control of Small Diameter UNS S32750 Super Duplex Stainless Steel Pipe

Lianshuang ZHANG; Kun CHEN; Bingsuo YAN; Kai SONG; Quanchang TANG; Jialiang FENG

doi:10.7512/j.issn.1001-2303.2022.09.12

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Welding Process and Difficulty Control of Small Diameter UNS S32750 Super Duplex Stainless Steel Pipe
Vol. 52, Issue 9, Pages: 77-80(2022)
Received：13 January 2022，

Revised：2022-07-23，

Published：25 September 2022
DOI： 10.7512/j.issn.1001-2303.2022.09.12
稿件说明：

移动端阅览

张连爽，陈坤，颜丙锁，等.UNS S32750超级双相不锈钢小管径焊接工艺及难点控制［J］.电焊机，2022，52（9）：77-80. DOI： 10.7512/j.issn.1001-2303.2022.09.12.

ZHANG Lianshuang, CHEN Kun, YAN Bingsuo, et al.Welding Process and Difficulty Control of Small Diameter UNS S32750 Super Duplex Stainless Steel Pipe[J].Electric Welding Machine, 2022, 52(9): 77-80. DOI： 10.7512/j.issn.1001-2303.2022.09.12.

摘要

某项目1 500 m深水管汇超级双相不锈钢管线中，控制系统Tubing管线均为小于1英寸的小管径，对焊工焊接水平要求极高，使用TIG焊打底容易形成根部堵塞风险。采用轨道自熔焊或自熔焊+填丝焊的焊接方法，焊道根部成形优异，且能成批获得良好的打底焊缝，焊接效果理想。因自熔焊对母材的椭圆度及焊缝组对精度要求较高，结合项目生产过程中遇到的焊接难题，进行深入分析并采取有效的解决措施。汇总UNS S32750小管径出现频率最多的焊接缺陷，提出纠错方案和注意事项，为后续项目生产提供良好的借鉴。

Abstract

For the welding of super duplex stainless steel pipeline in a 1 500 m subsea manifold project

the control system Tubings in the pipeline are small-diameter tube with diameter of less than 1 inch

which requires welder's welding skill level extremely high

and the risk of root blockage is easy to be formed by manual argon tungsten arc welding for backing weld. The company adopts the welding method of autogenous welding or autogenous + manual filler wire welding

which is applied in the production of the project. The forming of the root of bead is excellent

the good backing welds are obtained in batches

and the welding effect is ideal. Since autogenous welding requires high ellipticity of base metal and accuracy of weld assembly

combining with the welding difficulties in the production process of the project

in-depth analysis are made and effective solutions are taken. Through several production projects in the past few years

the most frequent welding defects are summarized

the error correction schemes in production are followed

and experience and lessons in production are summarized

which provides a good reference for subsequent project production.

关键词

Keywords

references

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