Electric heating – Metal heating – By arc
Reexamination Certificate
2007-07-09
2009-10-06
Hoang, Tu B (Department: 3742)
Electric heating
Metal heating
By arc
C219S130010
Reexamination Certificate
active
07598474
ABSTRACT:
A short circuit arc welding system is disclosed. The control scheme uses a current command signal comprised of a long-term current command that sets the long-term current command level and a real-time or short-by-short current command to drive the output current. Feedback is used to determine if the desired arc length is present and to adjust the long-term command. The short-by-short current command is derived from real-time arc current feedback and is used to control the burn-off rate by adjustment of the current command. The short being about to clear is detected in real time. When the process is ending a very low current level is provided to avoid forming a ball. If a short is created, after the low current level, a burst of energy is provided to clear of burn off the short. After the short is cleared, very low current is again provided to avoid forming a large ball, until the wire stops and the process ends.
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Stabilisation of transfer and methods of reducing the Spattering of metal in CO2with a short arc., I.S. Pinchuk, et al. Welding Production 1980, vol. 27, No. 6.
Holverson Todd E.
Hutchison Richard M.
Uecker James L.
Corrigan George R.
Hoang Tu B
Illinois Tool Works Inc.
Ralis Stephen J
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