Electric heating – Metal heating – By arc
Patent
1989-04-24
1990-04-10
Paschall, M. H.
Electric heating
Metal heating
By arc
21912154, 21912149, 219 75, B23K 900
Patent
active
049162837
ABSTRACT:
A plasma arc working apparatus of water cooling type provides a circulation system for circulating cooling water through a circulation passage in order to cool a working plasma arc torch and an introduction device for introducing pressurized gas into the circulation passage in order to drain the cooling water remaining in the circulation passage forcibly therefrom when the power switch for supplying electric power to the working apparatus is switched off.
REFERENCES:
patent: 3646311 (1972-02-01), Cameron et al.
patent: 4125754 (1978-11-01), Wasserman et al.
patent: 4700315 (1987-10-01), Blackburn et al.
patent: 4814577 (1989-03-01), Dallavalle et al.
Kubo Hirokazu
Nagasaka Moritoshi
Okada Toshihiko
Terayama Kikuo
Uchida Masanobu
Daihen Corporation
Paschall M. H.
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