METHOD AND APPARATUS FOR STRAIGHTENING WELDING DISTORTION OF THIN SHEET

摘要

PURPOSE:To prevent the distotion of the welded material being generated while carrying out the edge joint welding for the thin sheet, by sandwicheing the thin sheet to be welded between two thick plates, by previously giveing a distortion in the direction opposite to the welding distortion to this sandwich material as one body, and by carrying out the welding work, in the case of welding of thin sheet. CONSTITUTION:The thin sheets 21 and 22 are sandwiched between the press board 3 and the lower plate 2 so as to form a sandwich type material, which is then fitted into the jig 5, whose both side portions are pressed by the hydraulic jack 11. By this press load, the sandwich type material is distorted so as to swell out centering at the spacer 4. Under this condition, the edge joint welding is carried out for the upper edge of the projecting end in the thin sheets 21 and 22; hereby, the distortion is straightened by the welding shrinkage because of the previously given opposite distortion, and the straight welded formation is obtained.