Title:
CAPACITOR TYPE WELDING METHOD AND EQUIPMENT THEREOF
Document Type and Number:
Japanese Patent JP3648092
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To perform annealing without generating discoloring/thermal strain of an object to be welded, wear of a welding electrode, etc. by causing a post- stage heating pulse current of a single polarity to flow, after making a pulse type welding current flow.
SOLUTION: An object to be welded of the high carbon steel containing a carbon of 2% or higher is held between welding electrodes, resistance welding is performed by making single-pulse welding current flow at a state where welding force is applied to. Because this capacitor type resistance welding is performed by making a large current flow into the object to be welded, quenching is done together with the same welding as an other welding method, but only the welding part and its narrow surrounding region are turned into high temp., the area where hardness is increased by quenching is reduced. After resistance welding is completed, welding force is released in a lapse of cooling time after the resistance welding, annealing is done by causing a post-stage heating pulse current of a single polarity to flow at the state, where welding force is applied to, this post-stage heating pulse current has a peak value larger than that of the pulse welding current.
Inventors:
Koji Sasaki
Application Number:
JP14267299A
Publication Date:
May 18, 2005
Filing Date:
May 24, 1999
Export Citation:
Assignee:
Origin Electric Co., Ltd.
International Classes:
B23K11/26; B23K11/36; B23K31/00; C21D9/50; (IPC1-7): B23K11/26; B23K11/36; C21D9/50
Domestic Patent References:
| JP9168871A | ||||
| JP10017940A | ||||
| JP62024877A | ||||
| JP62028831A | ||||
| JP3042384U |
Other References:
奥田滝夫,スポット溶接入門,日本,産報出版株式会社,1994年 1月20日,重版,P.93-95,103-104,161-167
Attorney, Agent or Firm:
Kazuto Izumi