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.:
Date of Patent:
Jul. 15, 2014
Filed:
Jul. 20, 2010
Goro Watanabe, Tajimi, JP;
Yasuhiro Ishii, Nisshin, JP;
Yasumoto Sato, Nagoya, JP;
Tsunaji Kitayama, Nagoya, JP;
Hisaaki Takao, Seto, JP;
Hideki Teshima, Miyoshi, JP;
Keisuke Uchida, Nagoya, JP;
Goro Watanabe, Tajimi, JP;
Yasuhiro Ishii, Nisshin, JP;
Yasumoto Sato, Nagoya, JP;
Tsunaji Kitayama, Nagoya, JP;
Hisaaki Takao, Seto, JP;
Hideki Teshima, Miyoshi, JP;
Keisuke Uchida, Nagoya, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi-gun, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
Exemplary embodiments provide a resistance welding method capable of stabilizing quality or improving efficiency of resistance welding such as spot welding. This resistance welding method comprises a calculating step of calculating resistance ratio X of a second electric resistance value Rof workpieces to be joined in residual heat after Joule heating stops to a first electric resistance value Rof the workpieces immediately before the Joule heating stops or vice versa (R/Ror R/R); a determining step of determining whether the resistance ratio X is equal to or greater than a threshold value Xn, and a reheating step of carrying out the Joule heating again when the resistance ratio X is smaller than the threshold value Xn. Thereby at least part of a welding portion is melted and solidified to reliably form a nugget, and a stably resistance-welded member can be provided.