RESISTANCE SPOT WELDING METHOD

• Main Authors: KADOURA HIROAKI, HIOKI TORU, MATSUOKA HIDEAKI, YOSHINO AKIKO, IZUNO KYOSUKE, ASADA TAKASHI, AMAKO TATSUYUKI, MORI HIROYUKI
• Format: Patent
• Language: English; Japanese
• Published: 08.06.2022
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

To provide a resistance spot welding method which can certainly suppress generation of spatter during resistance spot welding.SOLUTION: In the state of "external dimension of an alloy layer/external dimension of a weld nugget≥1.2" after going through a growth process of a prescribed weld nugget in initial electrical conduction of resistance spot welding, the initial electrical conduction is shifted to a main electrical conduction, and the main electrical conduction is performed so that establishment of the afore-said formula continues. Although spatter is remarkably generated when a ratio of the external dimension of the alloy layer to the external dimension of the weld nugget becomes lower than 1.2, the initial electrical conduction is shifted to the main electrical conduction in the state where the afore-said formula is established, and a current value of the main electrical conduction is adjusted so as to continue establishment of the afore-said formula, whereby generation of spatter can be certainly suppressed.SELECTED DRAWING: Figure 5 【課題】抵抗スポット溶接時におけるスパッタの発生を確実に抑制できる抵抗スポット溶接方法を提供する。【解決手段】抵抗スポット溶接の初期通電において、所定の溶接ナゲットの成長過程を経た後、「合金層の外形寸法／溶接ナゲットの外形寸法≧１．２」となっている状態で、初期通電から本通電に移行し、前記式が成立し続けるように本通電を行う。溶接ナゲットの外形寸法に対する合金層の外形寸法の比率が１．２を下回った場合、スパッタの発生が顕著になるが、前記式が成立した状態で初期通電から本通電に移行し、且つ前記式が成立し続けるように本通電の電流値を調整することでスパッタの発生を確実に抑制することができる。【選択図】図５