High velocity electric-arc spray apparatus and method of forming materials
AssigneeFlame-Spray Industries, Inc.
InventorsDaniel R. Marantz, David R. Marantz, Keith A. Kowalsky
Life of this patent
Estimating the term…
Abstract
A high velocity arc spray apparatus includes a transferred-arc-plasma torch assembly which forms a transferred-arc column. A metal feedstock is fed into the transferred-arc column at an angle such that no portion of the metal feedstock is closer to the transferred-arc-plasma torch assembly than the leading edge of the metal feedstock in the feeding direction. A power source is coupled to both the metal feedstock and transferred-arc-plasma torch assembly for creating an electrical potential difference between the metal feedstock and the transferred torch assembly.
Claims29
A high velocity arc spray apparatus comprising transferred-arc-plasma torch assembly means for forming a transferred-arc column, metal feedstock feeding means for feeding a metal feedstock into said transferred-arc column at an angle such that no portion of said metal feedstock is closer than the leading edge of said fed metal feedstock to said plasma torch assembly means during operation as the leading edge intersects a plasma flow, power source means coupled to said metal feedstock and said transferred-arc-plasma torch assembly means for selectively energizing said transferred-arc-plasma torch assembly means and said metal feedstock to create an electrical potential difference between said metal feedstock and said transferred-arc-plasma torch assembly means with a corresponding electric current flow, said metal feedstock being an anode to effect the transfer of an arc formed by said transferred-arc column.
A high velocity arc spray apparatus comprising transferred-arc-plasma torch assembly means for forming a transferred-arc column, metal feedstock feeding means for feeding a metal feedstock into said transferred-arc column at an angle such that no portion of said metal feedstock is closer than the leading edge of said fed metal feedstock to said plasma torch assembly means, power source means coupled to said metal feedstock and said transferred-arc-plasma torch assembly means for selectively energizing said transferred-arc-plasma torch assembly means and said metal feedstock to create an electrical potential difference between said metal feedstock and said transferred-arc-plasma torch assembly means with a corresponding electric current flow, said metal feedstock being an anode to effect the transfer of an arc formed by said transferred-arc column, said power source means being a constant current device and varying a voltage to maintain said electric current flow and further including control means for determining the voltage of said power source means and deenergizing said transferred-arc-plasma torch assembly means when said voltage exceeds a predetermined voltage value.
The high velocity arc spray apparatus of claim 29, w herein said control means further turns off said metal feedstock feeding means when said voltage exceeds said predetermined voltage value.
Dependencies are inferred from the claim text.