B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/45
B23K 9/16 (2006.01) B23K 10/00 (2006.01) H05H 1/34 (2006.01)
Patent
CA 1059219
ABSTRACT The specification describes an improved orifice tip for use in a plasma arc torch, the tip comprising a substantially cylindrical rod-like member having an interior axial passage, an integral portion of the cylindrical member forming an eloctrode for development of the arc and also forming a passage for communication of plasma developed by the arc away from the welding and cutting torch, the member being formed from an isotropic graphite of substantially uniform thermal conductivity in the longitudinal and transverse directions of the axial passage and having an average particle grain size of less than about 0.003 inches and an average pore size of less than about 1 micron and providing a good machinable graphite for forming the passage, the isotropic graphite forming the cylindrical member having selected qualities of a coefficient of thermal expansion in the range of about 4.6 x 10-6 to about 5 x 10-6 per degree Fahrenheit and a good electrical resistivity in the range of about .7 x 10-3 ohm inches to 1 x 10-3 ohm inches at 70°F.
246141
Pieren William R.
Stetson Robert F.
LandOfFree
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