Abstract: A method for bonding overlapped end portions of a binding strap encircled about articles to be bound and tightened to a tensioned state by means of a gripper disposed at a gripping station for gripping a leading end portion of the binding strap, and drive rollers driven in their reverse mode so as to retract a trailing end portion of the binding strap, comprises the steps of interposing a plate electrode between the article being bound and the overlapped portions of the binding strap, lowering a single electrode tip, disposed above the overlapped portions of the binding strap, into contact with the overlapped portions of the binding strap such that the latter is compressed between the electrode tip and the plate electrode, and energizing the electrodes so as to perform a spot-welding operation at a first location, upon said overlapped portions of the binding strap, which is remote from the gripping station.