| 摘要 |
Embodiments of the present invention are directed to an air cooled, retract-start plasma cutting torch having improved performance. The torch comprises any one, or a combination of an improved nozzle, electrode, shield cap and swirl ring, where these components have improved geometries and physical properties which optimize plasma jet performance during cutting. |
| 主权项 |
1. An electrode for an air cooled plasma torch, said electrode comprising:
a thread portion having a thread to secure said electrode; a securing portion positioned downstream of said thread portion, in an electrical current flow direction, where said securing portion comprises a large diameter portion having a diameter which is the largest diameter of said electrode and a nut portion, where said nut portion is positioned downstream of said large diameter portion and where said nut portion is configured to be engageable with a standard nut removal tool, a cylindrical portion downstream of said nut portion, said cylindrical portion having a maximum outer diameter such that the ratio of the diameter of the large diameter portion to said maximum diameter of said cylindrical portion is in the range of 1.4 to 1.8, and where said cylindrical portion comprises a distal end which has a circular flat end surface; and a hafnium insert inserted into said distal end of said cylindrical portion, said hafnium insert has a cylindrical shape having a length to diameter ratio in the range of 2 to 4; wherein said circular flat end surface has a diameter such that the ratio of the diameter of said circular flat end surface to said maximum diameter of said cylindrical portion is in the range of 0.8 to 0.95. |
