Arc torch JTST historical patent #33
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JTTEE5 13:33-36 DOI: 10.1361/10599630418059 1059-9630/$19.00 © ASM International
Arc Torch JTST Historical Patent #33* UNITED STATES PATENT OFFICE 2,858,412 John S. Kane, Watchung, and Clifford W. Hill, Mountainside, N.J., assignors to Union Carbide Corporation, a corporation of New York Application July 6, 1956, Serial No. 596,185, Patented Oct. 28, 1958 19 Claims. (Cl. 219-75) This invention relates to arc torches of the character disclosed in the copending application of R.M. Gage, U. S. Serial No. 524,3S3, and has for its principal object to provide an improved torch for carrying out the process disclosed therein. This is a transferred type high pressure electric arc torch provided with a nozzle having a non-consumable solid walled passage for laterally constricting the arc and gases and then discharging the resultant current-carrying event which is stable, directional and shaped to follow a well-defined path corresponding to the geometry of such passage. Other objects of the present invention are to provide effective insulation between the nozzle and the electrode holder, and between the nozzle and electrode to prevent the pilot arc from passing other than between the electrode and the orifice wall, to provide a cooling jacket for the orifice wall, to provide cooling fluid passage means inside the torch body and nozzle for supplying cooling fluid to said cooling jacket, and to positively center the electrode with respect to the outlet orifice of said wall in order to obtain the desired high quality cuts. The gas shielded arc cutting torch comprises a torch body, an electrode holder carried by said torch body, a gas directing nozzle carried by said torch body but insulated therefrom and extending below said electrode holder, a replaceable orifice wall in said nozzle having an orifice small enough to constrict the arc from the electrode, and gas passage means extending from an inlet in said body through the torch to said arc constricting orifice. According to the present invention a water jacket is provided for the orifice wall, and an annular refractory ceramic liner is provided inside the nozzle below the electrode holder to prevent the pilot arc from passing other than between the orifice wall and the electrode. Preferably the ceramic insert is provided with interna1 bearings to center the electrode. The nozzle preferably forms a water jacket outside of the electrode bolder and above the ceramic liner, and the nozzle has passages therebelow communicating with the water jacket for the orifice wall. In the drawings: Fig. 1 is a vertical cross section through an arc torch according to the preferred embodiment of the present invention; and Fig. 2 is a plan of the electrode centering ceramic liner. The torch comprises a body B having a bore the lower end of *This series of historical patents concerned with thermal spray technology has been compiled by C.C. Berndt (SUNY at Stony Brook, NY) and K.A. Kowalsky (Flame-Spray Industries, Inc., NY).
Journal of Thermal Spray Technology
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