| 摘要 |
PURPOSE:To perform titled full-circled welding efficiently in a short time at a low cost, by placing a square steel pipe which is tack welded with a square steel plate for a partition wall provided with grooves on four sides in a specific state then welding the grooves through the through-holes of the square pipe walls. CONSTITUTION:Strap plates 3 consisting of flat steel projecting from a square steel plate 2 for a partition wall by the size corresponding to a groove distance are welded over the entire circumference on both surfaces of said steel plate to constitute a square steel plate A for the partition wall provided with the strap plates formed with grooves 4a-4d. After such plate A is tack welded to the prescribed position of a square steel pipe 1, the steel pipe 1 is positioned in a specified position by means of jigs, etc. in such a way that the diagonal lines of the section perpendicular to the pipe axis are made approximately vertical. Through-holes 6a-6e are beforehand punched respectively on the diagonal upper extension lines of the grooves 4a-4d of the plate A and the diagonal lower extension lines of the groove 4b, and further end tabs 7a-7e are welded to the surfaces thereof. Therefore, a flux is charged in the bottom of the groove 4b, and coated consumable electrodes 9 are inserted and fixed in the grooves 9; thereafter, the grooves are subjected to weld all around by an electroslag or electrogas welding method. |
