Einrichtung zum Zweiseitenschweissen schwer wendbarer Werkstuecke

摘要

1,234,198. Welding by fusion. MESSER GRIESHEIM G.m.b.H. 18 Nov., 1968 [22 Nov., 1967], No. 54667/68. Heading B3R. A butt joint between steel sheets, billets, strips or, e.g. in shipbuilding, plates is effected without turning over of the workpieces by welding from below by metal-arc process, and simultaneously or, as shown, subsequently from above by submerged arc process using filler metal. As shown, an M.I.G. process (advantageously pulsed arc) welding machine 11 is mounted in a pit 7 having an inspection gangway 27 and is movable on rails 9, 91 transversely of a line of rollerways 3, 2, 1 movably supporting plates 4, 5, 6. The machine 11 comprises a current source 12, a head 13, a torch 14, and a wire reel 15, current, protective gas and cooling water being conveyed through ducts 16. The torch 14 is adjustable transversely of the joint. A series of magnetic or, as shown, hydraulic clamps 23-26 is provided. A submerged arc welding machine 28, also transversely movable, on rails 30, 301, is positioned downstream of the machine 11. In operation, the edge of the plate 5 is aligned with the torch centre, e.g. with aid of retractable hinged stops (not shown), and clamped. Thereafter the plate 6 is moved into abutment with the plate 5 and clamped, and the bottom weld is effected. The plates 5, 6 are then moved into a second position, beneath the machine 28, and after the top weld is effected, by one or more layers, the welded plates may be moved further on the rollerway 3 for further processing, e.g. cutting to shape, marking and welding on of components. In an alternative embodiment, the top machine 28 may be positioned between the clamps 25, 26 and may be guided on the clamp support 18. In such an arrangement, the second weld may be effected simultaneously with, but offset slightly to so as to follow, the first weld. Fig. 2 shows a preferred edge preparation with dimensions a, b respectively generally 1-2 mm. and 5 mm.