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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10421145 B1

PDFFull Text
Date of Patent:
Sep. 24, 2019

Filed:

Dec. 01, 2015

Method for producing circumferential weld joint for low-carbon martensitic stainless steel pipes

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Takeshi Suzuki, Handa, JP;

Yukio Miyata, Handa, JP;

Hiroki Ota, Handa, JP;

Shinsuke Ide, Handa, JP;

Assignee:

JFE Steel Corporation, Tokyo, JP;

Attorney:

RatnerPrestia

Primary Examiner:

Anthony J Zimmer

Int. Cl.
CPC ...
B23K 9/23 (2006.01); B23K 35/30 (2006.01); B23K 31/00 (2006.01); C22C 38/00 (2006.01); C22C 38/40 (2006.01); C22C 38/58 (2006.01); B23K 9/028 (2006.01); C21D 6/00 (2006.01); C21D 9/08 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/50 (2006.01); B23K 101/06 (2006.01); B23K 103/04 (2006.01);
U.S. Cl.
CPC ...
B23K 9/23 (2013.01); B23K 9/0282 (2013.01); B23K 31/00 (2013.01); B23K 35/30 (2013.01); B23K 35/3086 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 9/08 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/50 (2013.01); C22C 38/58 (2013.01); B23K 2101/06 (2018.08); B23K 2103/05 (2018.08); C21D 2211/008 (2013.01);
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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