On Tue, 18 Dec 2012 09:34:56 +0000, Richard Smith wrote:
This video was made with a system using monochromatic illumination with a
matching bandpass filter on the camera, which blocks almost all of the
light emitted by the arc and almost none from the illumination. See US
patent 4,225,771 for details, from 1980. While this method has been used
to monitor remotely controlled welding in nuclear applications since its
development, this is the first video made with it that I have seen on the
I saw a very interesting video made with this method in the mid 80's at a
nuclear welding conference, where they demonstrated pulsed GMAW both in
the now common drop per pulse mode and in spray mode, where a high
frequency pulsed component on top of the base DC was used to adjust the
width to depth ratio of the weld over a very large ratio. I thought this
would be widely adopted by now, but I haven't seen much of it, perhaps
just because I haven't been looking much.
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