Electric heating – Metal heating – By arc
Patent
1989-12-28
1991-06-25
Albritton, C. L.
Electric heating
Metal heating
By arc
21912171, 21912182, B23K 2600
Patent
active
050269658
ABSTRACT:
It is an object of the present invention to provide a tube with precise holes. The side of a tube is drilled at predetermined intervals by a laser beam while the tube is being conveyed in its longitudinal direction in a tubular state. In consequence, manufacture is facilitated, and the precise holes can be drilled.
REFERENCES:
patent: 4028525 (1977-06-01), Mominee et al.
Fujimura Mitsuaki
Ohe Tatsuya
Albritton C. L.
Mitsui Petrochemical Industries Ltd.
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