Electric heating – Metal heating – By arc
Reexamination Certificate
2007-08-14
2007-08-14
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
By arc
C219S127000
Reexamination Certificate
active
10510430
ABSTRACT:
The invention relates to a welding method involving the use of a non-fusing electrode (12) according to which the electrode (12) is provided with power from a power source once the arc (11) between the electrode (12) and the workpieces (13, 14) to be joined has been ignited. The invention also relates to a tack welding method. The aim of the invention is to improve the quality of the weld seam in the starting phase of the welding process. To this end, the invention provides that before the actual welding process, a start program (22) is performed without the introduction of a filler material during which the electrode (12) is supplied with pulsed power in the form of current or voltage pulses over a presettable length of time (23) whereby causing the liquid molten bath to oscillate or vibrate, and that after the execution of the start program (22), the actual welding process is carried out during which the electrode (12) is preferably supplied with constant power.
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Aendenroomer A J R et al: “Weld Pool Oscillation as a Tool for Penetration Sensing During Pulsed GTA Welding” Welding Journal, American Welding Society, Miami, US, vol. 77, NR. 5 pp. 18-S-87S XP000831416 ISSN: 0043-2296 The Whole Document. (enclosed).
Artelsmair Josef
Mörtendorfer Bernhard
Collard & Roe P.C.
Fronius International GmbH
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