Title:
SPOT WELDING METHOD
Document Type and Number:
WIPO Patent Application WO/2015/170687
Kind Code:
A1
Abstract:
A spot welding method according to the present invention has steps for a preparatory application of current, a first application of current, a second application of current, and a third application of current. Preparatory application of current: A welding current is gradually increased (in an upslope manner, for example) in order to improve the fit of the contact surfaces between steel plates and to reduce plate gaps. Because rapid loading of current causes current application to be localized and then splash occurs as a result of the welding of sections where current is applied, current is applied gradually (in an upslope manner, for example) and localized heating is avoided. First application of current: The contact surfaces between the steel plates are fit by the preparatory application of current, a fixed welding current is applied when the contact surfaces have been fit, and a nugget is produced by the heat that is generated from the electrical contact resistance between the plates. Second application of current: The current is reduced below the level of the first application of current and the nugget is made to grow in the radial direction while internal splash is suppressed. Third application of current: When the diameter of the nugget reaches a certain size during the second application of current step, the current is increased above the level of the second application of current, and the nugget is made to grow primarily in a plate-width direction as well as in the radial direction.
Inventors:
FURUSAKO SEIJI (JP)
MIYAZAKI YASUNOBU (JP)
NISHIBATA HITOMI (JP)
TAKAHASHI YASUO (JP)
MIYAZAKI YASUNOBU (JP)
NISHIBATA HITOMI (JP)
TAKAHASHI YASUO (JP)
Application Number:
PCT/JP2015/063111
Publication Date:
November 12, 2015
Filing Date:
May 01, 2015
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B23K11/11; B23K11/16; B23K11/24
Domestic Patent References:
| WO2007077393A2 | 2007-07-12 |
Foreign References:
| JP2010247215A | 2010-11-04 | |||
| JP2010207909A | 2010-09-24 | |||
| JP2010240740A | 2010-10-28 | |||
| JP2003236674A | 2003-08-26 | |||
| US20130020288A1 | 2013-01-24 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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