Patent ID: 6215091
Filing Date: 2001-04-10
Classification: H05H

Abstract:
A plasma torch, comprising:a body having a gas supplier for supplying plasma gas;a cathode supporter having a front end and a rear end, mounted on said body at the rear end thereof;a button-cathode for generating plasma arc, which is assembled to the front end of said cathode supporter;a hollow-cathode having an inner surface and an outer surface, surrounding said button-cathode, the inner surface of which is spaced from said button-cathode, being assembled to said cathode supporter, and being made of material with higher work function than material for said button-cathode; andwherein the plasma gas flows along the outer surface of the hollow cathode to make gas pressure low between the inner surface of said hollow-cathode and said button-cathode and plasma arc is produced between said anode electrode and said button-cathode.