Process for coating or welding easily oxidized materials and plasma torch for carrying out this process
First Claim
1. A process for coating oxidizable materials by plasma build-up welding of powdered additives with a plasma transferred arc which comprises applying a current selected from the group consisting of an alternating current of a frequency between about 10 to 100 Hz and a direct current which is super imposed with alternating current of a frequency between about 10 Hz to 200 KHz for generating the plasma transferred arc for powdered hard surfacing wherein a base point of the plasma arc is produced at a spherical position formed on an electrode.
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Abstract
A process for coating or welding easily oxidized materials is carried out by applying weld metal powder by a plasma powder welding process with an alternating current or with a direct current and a superimposed alternating current as welding current to generate a plasma arc for the powder welding process. For this purpose, one base of the plasma arc is produced in a spherical recess (34) of an electrode (32).
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Citations
26 Claims
- 1. A process for coating oxidizable materials by plasma build-up welding of powdered additives with a plasma transferred arc which comprises applying a current selected from the group consisting of an alternating current of a frequency between about 10 to 100 Hz and a direct current which is super imposed with alternating current of a frequency between about 10 Hz to 200 KHz for generating the plasma transferred arc for powdered hard surfacing wherein a base point of the plasma arc is produced at a spherical position formed on an electrode.
Specification