ARC SPOT WELDING METHOD AND WELDING DEVICE FOR PERFORMING SAME

WIPO Patent Application WO/2016/056563

A1

Provided are an arc spot welding method capable of producing a predetermined weld bead diameter and reinforcement height in rear-surface weld beads during arc spot welding and obtaining weld joints having excellent tensile strength in terms of both TSS and CTS, and a welding device for performing the method. In the method, a steel plate (1) having a thickness t and containing at least 0.2 mass% carbon, and at least one steel plate (1) having a thickness of at least t and containing at least 0.2 mass% carbon are positioned so as to overlap; a backing metal (4), which has a non-contacting part and a contacting part whereby the non-contacting part is maintained in a non-contact state relative to the rear surface of the lower steel plate, is positioned such that the contacting part contacts the rear surface of the lower steel plate (1) at a position more than 3t from the circle-equivalent center of a rear-surface weld bead; arc generation is repeatedly carried out in alternation with the application of a short-circuit current at which the welding voltage between a welding wire and the upper steel plate becomes 10 V or less, such that the period of the short-circuit current application is 30–60%, exclusive, per cycle; and the steel plates (1, 1) are welded.

KODAMA SHINJI (JP)
FURUSAKO SEIJI (JP)
MIYAZAKI YASUNOBU (JP)

PCT/JP2015/078387

April 14, 2016

October 06, 2015

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NIPPON STEEL & SUMITOMO METAL CORP (JP)

B23K9/007; B23K9/02; B23K37/06

WO2015016287A1

2015-02-05

JP2009507646A	2009-02-26
JPH08155645A	1996-06-18
JPH0639542A	1994-02-15
CN102896398A	2013-01-30
US4359599A	1982-11-16

See also references of EP 3205433A4

AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)

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