| 摘要 |
PROBLEM TO BE SOLVED: To obtain the excellent welded quality even in the case of welding members having different thicknesses or materials by executing feedback control to a holding means or a first pressurizing means or a second pressurizing means so that the difference between the first pressurized force and the second pressurized force becomes a value forming a nugget. SOLUTION: At the time of seam-welding two pieces of aluminum-plated steel plate materials W1, W2, the difference between the thicknesses of the plate materials W1, W2 is inputted into a computer 9 as a leaning quantity (t) of the nugget and the pressure defferenceΔF between the electrodes enabling the formation of the nugget N is decided by collating with an FT map. The upper pressurized force (fu) is given to the welding materials W with an upper roller electrode 3 and the lower pressurized force (fd) is given to the welding material W with a lower roller electrode 6. The upper pressurized force (fu) and the lower pressurized force (fd) are detected with load cells and this differenceΔf is calculated, and at the time of equaling with the pressure differenceΔF between the electrodes enabling the formation of the nugget N, the welding current is conducted. By this constitution, the welding material W obtains the excellent welding quality.
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