GB549983A - Improvements in jigs for plate welding - Google Patents

Abstract

549,983. Uniting plates by fusion. GUY MOTORS, Ltd., and BULLOCK, W. E. May 30, 1939, No. 15813. [Class 83 (iv)) A jig for welding plates, particularly the complete side of an armoured vehicle, comprises a rigid base, a number of adjustable members for supporting the plates in the relative planes in which their edges are to be welded together, and a number of co-operating clamps operated either by springs or simultaneously or individually by hydraulic or pneumatic power. A number of supports 2 may be welded to or adjustable on parallel steel joists 4 supported by joints 5. The plates are held on the supports by spring, hydraulic, or pneumatic clamps 10 which are mounted on arms 6 pivoted on supports 9 or 9a and carry universally mounted contact members 11. The clamping is effected away from the edges so as to prevent internal stresses due to welding. The arms may be held in operative position by pivoted shackles 14 engaging hooks 15 on the parts 2 and may be held in inoperative position by boss 24 engaging the supports 9a or by spring-pressed bolts 25. The plates may be adjusted on the supports 2 by eccentrics 23. Fluid pressure clamps may each be provided with a separate valve 10a and gauge, and all the clamps may be controlled by a master valve. After the external welds have been effected an auxiliary jig consisting of longitudinal channel members 19 welded to lateral plates 20 having attachment lugs 21 may be placed over the welded plates, and secured thereto, and then inverted and an internal weld made. An internal wash weld may alternatively be made during the external welding operation the underside of the joists being supported by backing strips of copper provided in recesses in the supports.