Electric heating – Metal heating – Nonatmospheric environment at hot spot
Patent
1976-01-07
1978-06-13
Reynolds, Bruce A.
Electric heating
Metal heating
Nonatmospheric environment at hot spot
21913741, 356 36, B23K 916
Patent
active
040950808
ABSTRACT:
The extent of shielding function of an arc atmosphere is measured by the concentration of nitrogen oxide in the arc atmosphere. The concentration of nitrogen oxide in the arc atmosphere is measured by a nitrogen oxide measuring device. The measured value is indicated by an indicator. When the measured value exceeds a predetermined reference value, an alarm device is operated or a welding operation is stopped. Either a supply of shielding gas which forms an arc atmosphere is controlled, or a flow of fume is controlled through a fume exhaust device, as a function of the measured value.
REFERENCES:
patent: 3432637 (1969-03-01), Witting
patent: 3524038 (1970-08-01), O'Kelly, Jr.
patent: 3562581 (1971-02-01), Sonju
patent: 3791743 (1974-02-01), Cody et al.
Ueyama Fumio
Yoshimitsu Takao
Herkamp N. D.
Osaka Denki Co., Ltd.
Reynolds Bruce A.
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