| 摘要 |
<p>A method for providing the starting point of an electric arc in an electrode (1) of a thermal plasma cutting torch, comprising the steps of: forming a substantially cylindrical axial seat (3) in the electrode (1), at the end from which the electric arc must start, the seat (3) being adapted to receive, with tolerance, a substantially cylindrical insert (4) made of hafnium or zirconium, and heading the insert (4) inside the seat (3) so as to produce a stable and uniform intimate contact of its outer surface with the inner surface of the seat (3) which is adapted to firmly retain the insert (4) in the seat (3). <IMAGE></p> |
