ESTIMATION METHOD FOR NUGGET DIAMETER IN RESISTANCE SPOT WELDING

• Main Authors: MATSUKI YUKI, IZUNO KYOSUKE, OGASAWARA TOMOKO, OKITA YASUAKI, OGURA SHUHEI, SEKIGUCHI TOMOHIKO, KODAMA MIZUKI
• Format: Patent
• Language: English; Japanese
• Published: 19.01.2024
• 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 an estimation method for a nugget diameter, which can improve accuracy in estimating the nugget diameter.SOLUTION: An estimation method for a nugget diameter comprises: an actually-measured initial resistance value obtaining step of obtaining an actually-measured initial resistance value which is an initial electric resistance value in an energization period of time; an actually-measured resistance value difference calculating step of calculating an actually-measured resistance value difference which is a difference between a master initial resistance value and the actually-measured initial resistance value; a correction value calculating step of calculating a correction value for a welding parameter by plugging the actually-measured resistance value difference calculated in the actually-measured resistance value difference calculating step into a correction formula indicating a correlation between the actually-measured resistance value difference and the correction value for the welding parameter; a parameter correcting step of correcting a value of the welding parameter by applying the correction value calculated in the correction value calculating step to the value of the welding parameter measured during target welding; and a nugget diameter calculating step of calculating the nugget diameter by plugging the corrected value of the welding parameter into the estimation formula.SELECTED DRAWING: Figure 2 【課題】ナゲット径の推定精度を向上させることが可能な、ナゲット径の推定方法を提供する。【解決手段】通電期間の初期の電気抵抗値である実測初期抵抗値を取得する実測初期抵抗値取得工程と、マスタ初期抵抗値と実測初期抵抗値と、の差分である実測抵抗値差分を算出する実測抵抗値差分算出工程と、実測抵抗値差分と溶接パラメータの補正値との相関関係を示す補正式に、実測抵抗値差分算出工程において算出された実測抵抗値差分を代入して溶接パラメータの補正値を算出する補正値算出工程と、対象溶接時に測定された溶接パラメータの値に、補正値算出工程において算出された補正値を適用することによって溶接パラメータの値を補正するパラメータ補正工程と、補正後の溶接パラメータの値を、推定式に代入してナゲット径を算出するナゲット径算出工程と、を備える。【選択図】図２