| 摘要 |
PURPOSE:To reduce the deterioration in metallic structure of a spot weld zone, and to raise the mechanical strength by making a high frequency current flow to a joint surface, heating the joint surface to a temperature being below a molten state of a metallic plate, pressing this joint surface, and joining it plastically. CONSTITUTION:A pair of metallic plates to be joined 6 are inserted between a pair of upper and lower coaxial electrodes 14, 15, pressed by both the coaxial electrodes 14, 15, and inserted and held. Subsequently, from high frequency power source devices 11a, 11b whose phases are different from each other, a high frequency power source is applied separately to the respective inside and outside core electrodes 14a, 14c, 15a and 15c of the upper and lower coaxial electrodes 14, 15 through coaxial cables 12, 13. Also, a joint surface 6 is brought to dielectric heating up to a temperature being below a molten state of the pair of metallic plates to be joined 6, and the joint surface 6c is joined plastically by applying a prescribed pressure between the coaxial electrodes 14, 15. |
