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3. 发明专利

JP5291454B2 Pipe welding method 有权
公开(公告)号：JP5291454B2
公开(公告)日：2013-09-18
申请号：JP2008331915
申请日：2008-12-26
申请人：三菱重工業株式会社
发明人：誠司瀧花 , 鴨　　和彦 , 靖博正田
IPC分类号： B23K37/00 , B23K9/028
摘要： PROBLEM TO BE SOLVED: To surely perform a butt welding of pipe by being hardly affected by heat or moisture inside pipe during welding and by maintaining an inert gas atmosphere in a weld zone circumference over a long period of time. SOLUTION: The method of butt-welding pipe by using a water soluble balloon comprises: a step (S1) in which a plurality of expanded balloons are set in respective pipes in a manner closely adhered to the inner face; a step (S2) in which joining ends of pipes are abutted on each other, with the inner space substituted with an inert gas environment; a step (S3) of welding the butted part of the pipes; and a step (S4) of melting the plurality of balloons by supplying fluid into the pipes. In the step of setting the balloons, those situated on the joining end side among the plurality of balloons are set to be made away from the joining ends by a predetermined value or over and outside a region deviated from a high temperature region during the welding. COPYRIGHT: (C)2010,JPO&INPIT

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