公开(公告)号：US20210321495A1

公开(公告)日：2021-10-14

申请号：US17270685

申请日：2019-08-21

申请人： NETUREN CO., LTD.

发明人： Hidehiro YASUTAKE ,  Takashi HORINO ,  Hiroki INOUE ,  Hiroaki KINOSHITA

IPC分类号： H05B6/10 ,  H05B6/40 ,  H05B6/44

摘要： A heating coil includes a plurality of loop portions disposed coaxially along an axis, a first lead portion and a second lead portion which electrically connect to a power source, and a connection portion which connects the plurality of loop portions, the first lead portion, and the second lead portion in series.

公开(公告)号：US20180104761A1

公开(公告)日：2018-04-19

申请号：US15558745

申请日：2016-06-24

申请人： NETUREN CO., LTD.

发明人： Takashi HORINO ,  Akira TERAJIMA ,  Fumiaki IKUTA ,  Hiroki INOUE

IPC分类号： B23K11/11 ,  B23K11/26 ,  B23K11/31

摘要： A direct resistance heating simulation method is provided. In this method, a welding region and its peripheral region of steel sheets to be welded by a pair of electrodes are divided into a plurality of elements. A coupled analysis is performed such that a temperature, a metal structure, stress and strain at each element are determine in a mutually associated manner based on Joule loss obtained through a current analysis and a magnetic field analysis for each element. The coupled analysis is repeated to predict an effect of one or more parameters, including at least one of a frequency, a magnitude and an application time of electric current to be applied to the electrodes, a cooling time, a pressure applied from the electrodes to the steel sheets and a shape of the electrodes, on welding quality after a post-heating by direct resistance heating and to improve weld strength.