Patent GB-627417-A (GB)
Title: Improvements in welding apparatus
IPC: B23K9/02
Filed: 1947-02-26
Abstract: 627,417. Uniting by fusion. HOLDING INTERCITO SOC. ANON. Feb. 26, 1947, No. 5620. Convention date, Feb. 26, 1946. [Class 83 (iv)] In welding by apparatus which clamps the work between two members with a flux-coated rod electrode laid in a welding channel and continuously fused by arcs, the electrode is overlaid during welding by a swingably-mounted rail member which may thus be displaced to expose the channel for cleaning &c. The apparatus may consist of a pedestal 2, Fig. 1, provided with a foot 1 and carrying a fixed arm 3 in which a grooved member 9, Fig. 5, may be mounted, and a vertically adjustable swingable arm 4 having a channel-member 11 adjustable by screws 8, between which the work parts are clamped by a stirrup 5 provided with a tensionscrew 6. The electrode 13 which is covered,by the channel-member is held in an insulated holder to which the cable 15 is connected, and the holder may be attached to a stirrup 17 terminating in a spring hook 18 hooked on to a stirrup 20 carried by the end of the arm 4 so that as soon as the electrode 13 ceases to be supported by the rails 9, 11, it swings downwardly and breaks the electrical circuit. If desired, the holder may be applied to the electrode at the pedestal end of the apparatus, the holder being mounted in a stirrup 26, Fig. 6, rotatable about a pin 25 so that at the end of the welding operation it falls downwards and strikes against an insulating plate 27 to break the circuit. In order to arrange the work parts in an inclined plane the pedestal may be pivoted at its lower end on a wheeled carriage, the angle of the pedestal being adjusted by a telescopic screw connection between the carriage and an extension of the arm 3. In a further modification the pedestal may be pivoted on an axle fixed to the ground, the telescopic mechanism being passed round the pedestal and secured to the wall. The arms 3, 4 are rotatable about the pedestal so that they may be placed parallel to the wall when not in use. In welding parts which are longer than the rails a beam 42, Fig. 2, is arranged above and rests on a prop 44 fixed on the arm 4, and carries the stirrup 5 and a bracket 43. A beam 46 is fixed by members 47, 48 to the arm 3. Over-length tubes may also be welded using an enlarged stirrup 5 and introducing into the tube between the arm and the adjusting screw 6 a wedge block. In welding narrow closed containers such as oval tubes 56, Figs. 9 and 10, grooved supporting rails 53, 54, Fig. 7, are used, the grooved rail 11a covering the electrode. When one joint has been welded the work is turned over and the second joint effected. In a further form the work 56 may be mounted together with a rail 53 on a grooved T-support 65 and the rail 73 covering the electrode is mounted on a beam 71 secured by links 74 to weighted arms 75 pivoted to sleeves 76 vertically adjustable on pillars 67. The arms 75 are supported by stays 84 engaging stops 85 on verticallyadjustable blocks 87. The stays are released by draw-bars 88. The beams is pressed on the work by screws 70 adjustable in arms 69 on pillars. When the screws 70 are loosened after welding the counterweights are lowered until the arms 75 bear on abutments 90, whereupon the beam 71 is raised and swung by a handle 91 into the position shown in Fig. 9, where it is held in position by hooks 81 and pivoted latches 80.