| 摘要 |
PURPOSE:To make connection quickly and surely using simple means when spot welding butted part of the rear end of a preceding rolled material and the front end of succeeding rolled material, by specifying pointing pitch using an electrode of specified diameter. CONSTITUTION:The rear end of a preceding rolled material 1a and the front end of a succeeding rolled material 1b are butted, and the butted part is spot welded. When spot welding, plural electrodes 2 having diameter D more than 1 time of the thickness (t) of the rolled material, and pointing pitch L is set to less than 150mm.. In this case, by arranging the electrodes 2 at the same pitch with the pointing pitch L, welding is completed by one pointing. |
