抵抗スポット溶接継手の製造方法

Japanese Patent JP7368716

B2

To provide a manufacturing method for a resistance spot welded joint which is excellent in strength of joint, and is excellent in delayed fracture resistance.SOLUTION: A manufacturing method for a resistance spot welded joint is provided that comprises: a preliminary electric conduction step in which a steel plate surface is electrically conducted in a pressurized state by use of a pair of DR electrodes having a distal end diameter of 8 mm to 12 mm; a main electric conduction step in which the steel plate surface is electrically conducted in a pressurized state by use of a pair of DR electrodes; and a holding step in which pressurization with the pair of DR electrodes is held. When a pressurizing force is represented by P1(kN), an electric current is represented by I1(kA) and an electric conduction time is represented by t1(s) in the preliminary electric conduction step, and a pressurizing force is represented by P2(kN) and an electric current is represented by I2(kA) in the main electric conduction step, the following formulae (1) to (5) are satisfied: formula (1) 2≤I1/h<4; formula (2) 1.5≤P1/h<2.5; formula (3) 0.1≤t1/h≤1.5; formula (4) 4≤I2/h; formula (5) 2.5≤P2/h where h is a value which is 1/2 of total plate thickness (mm) of a plurality of steel plates.SELECTED DRAWING: Figure 1

Seiji Kosako
Shinji Kodama
Naoaki Shimada

JP2019202259A

October 25, 2023

November 07, 2019

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Nippon Steel Corporation

B23K11/11

JP2018171649A
JP2010172946A
JP2004358500A

WO2018123350A1
WO2017010071A1
WO2014171495A1

Sumio Tanai
Mitsuo Teramoto
Tomoo Katsumata
Hiroshi Yamaguchi

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