Metallurgical Industries, Inc.

Gary C Shubert

Dag Lindland

The welding method may be used to lay down weld beads on metallic substrates with a narrow width of 0.125 inch and less. The process employs a plasma transferred arc and pulses the current delivered to the arc such that a wave form having at least a main amplitude and a lower auxiliary amplitude is provided. The powdered metal which is delivered is laid down in a series of overlapping weld deposits which solidify very rapidly and produce a fine grain structure.

Narrow substrate having weld bead of powdered metal

The welding method is used to lay down weld beads on metallic substrates with a thin section, e.g., of down to 0.030 inch. The process employs a plasma transferred arc which is generated at low current, e.g., between 0.5 amps and 60 amps, and with a very high switching frequency, e.g., 15 KHz at the power supply. A low amount of heat is generated so that the thin section is not burned through. The surfacing powder is delivered into the arc and becomes metallurgically bonded to the substrate.

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Tinton Falls, NJ, United States of America

Gary C Shubert