US 2015/0174688 A1 · SPOT WELDING METHOD FOR HIGH STRENGTH STEEL SHEET

Abstract

A spot welding method for a high strength steel sheet is provided. The method includes a first pulse step for applying electric current of about 8 to 9 kA about 1 to 3 cy and a first cooling step for cooling for about 1 to 3 cy. In addition, the method includes a second pulse step for applying electric current less than the electric current applied in the first pulse step and a second cooling step for cooling for about 1 to 3 cy. A third pulse step includes applying electric current greater than the electric current applied in the second pulse step.

Claims11

Dependent claims

A spot welding method for a high strength steel sheet comprising:

a first pulse step for applying electric current of about 8 to 9 kA for about 1 to 3 cy;
a first cooling step for cooling for about 1 to 3 cy;
a second pulse step for applying electric current less than the electric current applied in the first pulse step;
a second cooling step for cooling for about 1 to 3 cy;
and
a third pulse step for applying electric current greater than the electric current applied in the second pulse step.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/451,759Filed 5 Aug 2014

Priority

KR 10-2013-016077320 Dec 2013

Published

25 Jun 2015

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

B23K 11/11
Spot welding; Stitch welding: spot welding
B23K 11/16
Resistance welding; Severing by resistance heating: taking account of the properties of the material to be welded
B23K 11/166
Welding of coated materials: of galvanized or tinned materials
B23K 11/241
Electric supply or control circuits therefor: electric supplies

Spot welding method for high strength steel sheet

Life of this patent

Spot welding method for high strength steel sheet

Life of this patent

Abstract

Claims11