Electric heating – Metal heating – For bonding with pressure
Patent
1995-11-07
1998-08-11
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219 92, 219 94, 2191171, B23K 1125
Patent
active
057930112
ABSTRACT:
A method and apparatus for continuously spot-welding galvanized steel sheets overlapped to be bonded by way of a spot welding machine having a pair of electrodes. The galvanized steel sheets clamp a resistance increasing material including a spacer to ensure a gap between the sheets. Bonding surfaces of the galvanized steel sheets partly contact each other when the pair of electrodes pressurize the galvanized steel sheets such that a part of the gap is retained around the spacer between the bonding surfaces. The retained gap has a size in which zinc melted or vapored when a weld current flows between the electrodes can escape through a weld section of the galvanized steel sheets to outside. The method comprises the step of recording an inter-electrode resistance for each spot when the continuous spot welding is executed by the pair of electrodes. The method estimates an electrode lifetime defined by one of the number of spots and a duration of the spot welding until a sufficient nugget will not be formed by way of the electrodes according to the record of the inter-electrode resistance. The method automatically changes weld conditions to enable the continuous spot welding when the electrode lifetime reaches a predetermined electrode lifetime.
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Sofue Tadashi
Watanabe Toichi
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Research Development Corporation of Japan
Shaw Clifford C.
Watanabe Toichi
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