Abstract: A spot welding apparatus for spot welding superposed workpieces by putting the superposed workpieces 3, 4 between a pair of electrodes 1, 2 and applying a welding current between the electrodes under application of pressure, the apparatus having heating coils 15 wound on each of the electrodes 1, 2, and being provided with high frequency heating means 17 for induction-heating welding portions of the workpieces contacted by the electrodes. The spot welding apparatus is capable of firmly spot welding workpieces made of high tension steel even if there is opening between the workpieces.

Abstract: A spot welding apparatus for spot welding superposed workpieces by putting the superposed workpieces 3, 4 between a pair of electrodes 1, 2 and applying a welding current between the electrodes under application of pressure, the apparatus having heating coils 15 wound on each of the electrodes 1, 2, and being provided with high frequency heating means 17 for induction-heating welding portions of the workpieces contacted by the electrodes. The spot welding apparatus is capable of firmly spot welding workpieces made of high tension steel even if there is opening between the workpieces.

Abstract: A paint film thickness predicting method for an actual car, which predicts a paint film thickness of an object car in an actual car state, an electrodeposition coating being applied to the object car by using an electrodeposition coating line, has a calculating an analyzed value of the paint film thickness of a constituent member constituting a part of the object car by executing electrodeposition coating analysis by using a computer, and a predicting the paint film thickness of the object car in the actual car state from the analyzed value of the paint film thickness by the computer, wherein the correlation predicting expression stipulates a correlation between the paint film thickness of a mass-produced car in the actual car state and an analyzed value of the paint film thickness of the constituent member.

Abstract: A paint film thickness predicting method for an actual car, which predicts a paint film thickness of an object car in an actual car state, an electrodeposition coating being applied to the object car by using an electrodeposition coating line, has a calculating an analyzed value of the paint film thickness of a constituent member constituting a part of the object car by executing electrodeposition coating analysis by using a computer, and a predicting the paint film thickness of the object car in the actual car state from the analyzed value of the paint film thickness by the computer, wherein the correlation predicting expression stipulates a correlation between the paint film thickness of a mass-produced car in the actual car state and an analyzed value of the paint film thickness of the constituent member.