Invention Grant
- Patent Title: Method for producing circumferential weld joint for low-carbon martensitic stainless steel pipes
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Application No.: US15532293Application Date: 2015-12-01
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Publication No.: US10421145B2Publication Date: 2019-09-24
- Inventor: Takeshi Suzuki , Yukio Miyata , Hiroki Ota , Shinsuke Ide
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: RatnerPrestia
- Priority: JP2014-243650 20141202
- International Application: PCT/JP2015/005970 WO 20151201
- International Announcement: WO2016/088364 WO 20160609
- Main IPC: B23K9/23
- IPC: B23K9/23 ; B23K35/30 ; B23K31/00 ; C22C38/00 ; C22C38/40 ; C22C38/58 ; B23K9/028 ; C21D6/00 ; C21D9/08 ; C22C38/02 ; C22C38/04 ; C22C38/42 ; C22C38/44 ; C22C38/46 ; C22C38/50 ; B23K101/06 ; B23K103/04

Abstract:
Provided is a method for producing a circumferential weld joint. With this method, when low-carbon martensitic stainless steel pipes used for pipelines for transportation of petroleum and natural gas are subjected to circumferential welding, the circumferential welding can be performed efficiently using a low-cost welding material having a composition similar to the composition of the low-carbon martensitic stainless steel pipes. Pipe ends of low-carbon martensitic stainless steel pipes containing prescribed components are butted against each other and subjected to multi-pass arc welding using a welding material containing prescribed components. In the first pass in the multi-pass arc welding, CMT welding is performed in which the welding material is moved back and forth against a molten pool to generate an arc intermittently. In the second and subsequent passes, one selected from GMA welding, GTA welding, and the CMT welding is performed.
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