Electric heating – Metal heating – By arc
Patent
1993-07-29
1994-07-12
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912148, 21912154, 21913001, B23K 1002, B23K 9095
Patent
active
053290895
ABSTRACT:
A welding torch for plasma arc welding apparatus has a transparent shield cup disposed about the constricting nozzle, the cup including a small outwardly extending polished lip. A guide tube extends externally of the torch and has a free end adjacent the lip. First and second optical fiber bundle assemblies are supported within the guide tube. Light from a strobe light is transmitted along one of the assemblies to the free end and through the lip onto the weld site. A lens is positioned in the guide tube adjacent the second assembly and focuses images of the weld site onto the end of the fiber bundle of the second assembly and these images are transmitted along the second assembly to a video camera so that the weld site may be viewed continuously for monitoring the welding process.
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patent: 3275795 (1966-09-01), Bosna et al.
patent: 3612807 (1971-10-01), Liefkens et al.
patent: 3832520 (1974-08-01), Glasser
patent: 4357515 (1982-11-01), Kiefer et al.
patent: 4581518 (1988-04-01), Takahashi et al.
patent: 4788401 (1988-11-01), Kleppen
patent: 5180921 (1993-01-01), Moreau et al.
McGee William F.
Rybicki Daniel J.
Broad, Jr. Robert L.
Manning John R.
Miller Guy M.
Paschall Mark H.
The United States of America as represented by the United States
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