Patent GB-314063-A (GB)
Title: Improvements in or relating to welding machines
IPC: B23K5/08
Filed: 1929-06-10
Abstract: 314,063. Svenska Aktiebolaget Gas-Accumulator. June 22, 1928, [Convention date]. Radiators.-In a machine for welding circular joints such as the necks of radiators, pipes, &c., a welding burner is adapted to enter into the exterior of the two pieces and to be moved round the joint. Radiator sections 1 rest on a table 32, which is suspended by wires 33 passing over discs 34 and provided with a counterweight 38. New sections are in turn superposed on the sections after each welding operation and in order to counterbalance such extra load a weight 36 or a spring is used which is connected to a wire 36a passing over a spirally grooved disc 37. The upper pair of sections are clamped by a pair of blocks 4, which are formed with semicircular gaps and with wedge-shaped jaws 5 and are raised in fixed inclined guides 6 into clamping position by weights 7. In the form shown in Fig. 1 for welding simultaneously the necks 23 at each end of the radiator sections, a pair of burners 2 are used mounted together' with their operating mechanism in frames 26, which, together with the guides 6, are adjusted on the bed 50 by a screw 51 so as to suit radiators of different sizes. Each burner is rotated by a cam 10 engaging a lever 11 provided with a wire 12 passing round a pulley 13 on the burner spindle 3, which is returned to normal position by a weight 14. The burner is moved axially into position opposite the joint by a lever 16 which engages a ring 15 on the spindle and is pushed down by a cam 18 against the action of a weight 25. The weight of the burner may be used to effect the downward motion in which case the lower flange of the ring 15 is dispensed with. The parts are pressed down to facilitate insertion of the work by plungers 28 pushed down against the work by cam-operated levers 29 returned by weights 31 or springs. The welding position is determined by adjustable rods 20 which engage the ring 15. Each rod is associated with a bowshaped member 21 which passes through the block 4 and rests by rollers 22 on parts of the work at the same distance from the joint. The cam shaft 27 is driven from a loose pulley 39 connected thereto by a one revolution clutch 40, the keyed portion of which has a bolt 43 normally pressed by a spring 41 into a notch in a disc 45 but released therefrom by a hand lever 42. After the first pair of sections are welded another section is placed thereon and the plungers 28 then operate to press down the work and table against the pressure of the weight 38, the jaws 5 being at the same time moved so as to release them from the previous sections whereupon they are returned by their weights 7 to clamp the two uppermost sections. The weight 38 then moves the parts into welding position. In order to maintain, during operation, the supply to the burner of acetylene and oxygen and also of air for blowing away exhaust gases and cooling the work, flexible supply pipes may be used or, as shown in Fig. 5, the burner may consist of a rotatable cylindrical slide 52 mounted on a member having conduits 47<a>, 48<a>, 49a respectively for gas, oxygen and air. In a further modification, Fig. 6, the burner is connected to stationary gas supply devices 54 by liquid seals 53. In an apparatus for welding sleeves or bushes in circular holes such as nipples in the end sections of radiators, the work is mounted on a bolt 55 on the table 32, Fig. 7, and the burner, which consists of several inclined nozzles 2, is rotated in one direction by a worm gear 57 through a cone clutch 58 and is returned by a weight 59. The axial motion is effected by a hand lever 60, a limiting stop 56 being provided.