This paper describes a new joining method of a copper sheet to metal pillars (copper bumps) and its experimental results. The pillars are put in holes of a thin insulator and near the sheet. When an impulse current from a capacitor bank passes through a flat one-turn coil, a magnetic flux is suddenly generated around the coil. Eddy currents are induced in the sheet placed between the coil and the insulator. Electromagnetic force acts on the sheet. The sheet can be welded to the pillers both by the Joule heat and by the high-speed collision to the pillers. The bank energy required for this welding is less than 2 kJ.%銅薄板の上に金属柱（銅バンプ）を埋めた絶縁板を少し離して重ねる．これらを絶縁された平板状ワンターンコイルの上に固定する．コンデンサ電源からコイルに放電大電流を急激に流す．銅薄板には，磁束が交差し，渦電流が流れ，電磁力（磁気圧力）が働く．銅薄板は，渦電流で加熱されるとともに，電磁力で金属柱へ高速衝突し，金属柱に圧接される．このような電磁庄接法により，電源エネルギー2kJ以下で，銅薄板を金属柱（銅バンプ）へ溶接する方法および実験結果を述べる．
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