Abstract
Relative values of heating time and current density for spot welding when the plate thicknesses are varied for various materials of differrent physicall constants are considered under the following assumptions:
1) The contact area of the electrode does not varies during welding
2) Heat flows only in the direction of x to electrodes.
3) Temperature at the contact surface to the electrode is assumed to be zero
4) Contact resistance is neglected
5) Electrical resistivity varies as ρ=ρ0(1+αθ), while other physical constants being assumed as constant.
The relation of reasonable heating time t and current density δ can be discussed easily from the fundamental equation (8), and the relations are shown in equations (9). The calculated value are shown in Table 3.
