公开(公告)号：EP2823927A4

公开(公告)日：2015-07-29

申请号：EP13757053

申请日：2013-03-07

Applicant: JFE STEEL CORP

Inventor： YOKOTA TOMOYUKI ,  HAYAKAWA NAOYA ,  KAWAI KEIJI ,  YANO KOJI

IPC: B23K9/18 ,  B23K9/12 ,  B23K9/26 ,  B23K9/28 ,  B23K35/02

CPC classification number: B23K9/282 ,  B23K9/123 ,  B23K9/188 ,  B23K9/26 ,  B23K35/0266 ,  B23K2201/04 ,  B23K2201/06

Abstract: The present invention provides a welding technology that allows stable welding even if a thin wire is used as a leading electrode in multiple-electrode submerged arc welding, particularly if welding is performed under welding conditions involving high wire feeding speed, or even if a flux-cored wire is used in which large winding remains after straightening. Provided are a welding torch, for use with a leading electrode in multiple-electrode submerged arc welding, that includes a contact tip, a connector for a power cable, a tube-shaped conductor disposed therebetween, and means for insulating the tube-shaped conductor from an electrode wire, and a multiple-electrode submerged arc welding method using such a welding torch.