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US 4,195,216 AGranted
Plasma welding
AssigneeROLLS-ROYCE plc
InventorsDerek J. Beauchamp, Donald L. A. Weston
Life of this patent
Estimating the term…
Abstract
In plasma welding apparatus controls are provided which regulate the rates of increasing and decreasing the welding parameters e.g., welding current, gas flow and wire feed to prevent the formations of craters in the weld at the end of a welding run. Improved welds are formed if the wire feed rate is increased prior to the start of the decrease in welding current but after the gas flow to the plasma arc has begun to decrease.
Claims5
A method of terminating a plasma welding operation comprising the steps of:
- initiating the conclusion of a welding run to close the keyhole formed during the welding run by the plasma arc piercing the workpiece, and subsequently increasing the rate of feed of filler material to the weld.
Dependencies are inferred from the claim text.