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Timing Control for Pulsed Plasma Needle Arc Welding

IP.com Disclosure Number: IPCOM000077873D
Original Publication Date: 1972-Oct-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Emmons, WD: AUTHOR [+3]

Abstract

A support frame 10, movable in the direction of the arrow,carries a plasma needle arc-weld head 11 in a line-which traverses the variably-spaced spaced circuit terminals 12 of a printed-circuit board 13 or the like. A fixture 14 maintains terminal wires 15 in contact with the circuit terminals 12, and holds the printed-circuit board 13 in position for the circuit terminals to be traversed by the weld head 11. Weld head 11 is electrically connected to a power supply 16 which has a ground connection to relay switch 17, which is connected to ground plane and circuit terminals 12 of the printed-circuit board 13.

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Timing Control for Pulsed Plasma Needle Arc Welding

A support frame 10, movable in the direction of the arrow,carries a plasma needle arc-weld head 11 in a line-which traverses the variably-spaced spaced circuit terminals 12 of a printed-circuit board 13 or the like. A fixture 14 maintains terminal wires 15 in contact with the circuit terminals 12, and holds the printed- circuit board 13 in position for the circuit terminals to be traversed by the weld head 11. Weld head 11 is electrically connected to a power supply 16 which has a ground connection to relay switch 17, which is connected to ground plane and circuit terminals 12 of the printed-circuit board 13.

The generation of a plasma arc from weld head 11 is timed to coincide with the arrival of the weld head 11 directly in line with the circuit terminals 12, and to remain turned on for the duration of traverse of the plasma arc over the weld site. Timing control is provided by sense switches S1 and S2 mounted on frame 10, and electrically connected respectively to timer circuits T1 and T2, which energize relay coil 18 of relay switch 17. Sense switch operators such as pegs P1 - P3 mounted in suitable locating holes, such as 19, in fixture 14 actuate the sense switches S1 and S2 at precisely the right location for welding conductors of leads 15 to the circuit terminals 12. The timer circuits T1 and T2, which may be capacitor discharged type circuits, may be adjusted to maintain the plasma needle arc energized...