| 摘要 |
PROBLEM TO BE SOLVED: To suppress dispersion of heating temperature by suppressing excessive heating of the maximum width part or the minimum width part of a planar workpiece, even when the non-rectangular planar workpiece is electrically heated.SOLUTION: A planar workpiece W1 having electrode fitting parts and having the maximum width part or the minimum width part and an auxiliary heating member W2 are prepared and superposed each other, and after fitting electrodes 11, a current is made to flow between both electrodes 11, to thereby heat the planar workpiece W1. The planar workpiece W1 and the auxiliary heating member W2 are prepared and superposed each other so that the sum total of a product of a sectional area and a reciprocal of an electric resistivity of the planar workpiece W1 and a product of a sectional area and a reciprocal of an electric resistivity of the auxiliary heating member W2 on a prescribed section orthogonal to the current-carrying direction becomes approximately constant in the current-carrying direction, and that each width in a direction orthogonal to the current-carrying direction of the planar workpiece W1 and the auxiliary heating member W2 superposed at the maximum width part or the minimum width part of the planar workpiece W1 becomes approximately same. |
