GB713507A - Improvements in gas shielded electric arc welding apparatus - Google Patents

Abstract

713,507. Uniting by fusion. AIR REDUCTION CO., Inc. July 10, 1952 [Jan. 31, 1952], No. 17412/52. Class 83 (4). [Also in Group XI] In gas shielded arc welding apparatus having a water jacketed nozzle coaxially arranged about a support through which a consumable electrode is fed, to form an annular shielding gas passage, an adjustably fixable locking means including an adjustable two-way coolant connection links the nozzle and support, whereby the latter may be moved relatively to one another. In an embodiment a welding gun comprises a rear barrel 100, a front barrel 200 and an inner barrel or electrode support 300. The barrel 100 comprises an outer casing 104 and an inner casing 106 held spaced by being secured to a frame block 16. A non-conducting casing 204 forming part of the barrel 200 is slidable in the space betwten the casings 104, 106 and is sealed there rom by a rubber ring 206. A nozzle 202 is carried on the casing 204 by being soft soldered at 222, 224 to a metal ring 210 threaded on the casing 204. Cylindrical surfaces on the nozzle 202 engage with surfaces on the ring 210 to form a coolant passage 220 about the nozzle 202. The inner barrel 300 comprises inner and outer casings 306, 308 secured to the block 16 within which is a non conducting liner 314. A current conducting contact tube 302 is threaded on the casing 308 to supply current to an electrode 4 fed from a tube 116 through the liner 314. A conduit 102 attached to the gun support supports the tube 116 and supplies shie'ding gas which flows between the casings 306 and 106, over a baffle 304 and out from the nozzle 202. Coolant is supplied from a pipe 10 to a nipple 22 and into one of two passages formed in the space between the casings 306, 308, along that passage to adjacent the tube 302 where it enters the other passage to return to an outlet 20. From outlet 20 the coolant flows to an adjustable connection 400. This connection 400 comprises a longitudinally partitioned tube 402 brazed to a block 226 fixed to the ring 210 and slidable within a tube 424 fitted in a tube 404 brazed'to the block 16 and connected to an outlet 417 in which the welding cable is arranged. The passages in tube 402 align with passages in the block 226 from. which lead tubes 234 and 236 (not shown) which take coolant to and from the passage 220. Coolant from the outlet 20 flows into an annular passage between tubes 404, 424 and through one of a series of radial holes 432, Fig. 11, in tube 424 into one of the longitudinal passages in the tube 402 by way of an elongated slot 414 in the tube 402. A barrier block 436 secured to the free end of the tube 402 closes the passage in communication with the slot 414 and rallows the return flow of the fluid after it has passed around the nozzle and back along the other passage through a passage 440 to the outlet 417. A seal 438 is provided about the block 436. A gland nut 422 engages a gland ring 444 to hold a packing ring 442 in sealing contact with the tubes 402, 404. The friction developed here locks the nozzle in its adjusted position. Specification 687,666 is referred to.