Browse Prior Art Database

Wave Solder Measuring Apparatus

IP.com Disclosure Number: IPCOM000081775D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Bernard, CD: AUTHOR [+2]

Abstract

The drawing shows a schematic representation of a conventional wave-solder apparatus having a tank 2 containing melted solder 3 that is agitated to form a wave 4. A pallet 5 is movable to carry a circuit board, not shown, across wave 4 for soldering components that are mounted on the board.

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Wave Solder Measuring Apparatus

The drawing shows a schematic representation of a conventional wave- solder apparatus having a tank 2 containing melted solder 3 that is agitated to form a wave 4. A pallet 5 is movable to carry a circuit board, not shown, across wave 4 for soldering components that are mounted on the board.

To analyze the soldering process, it is desirable to determine the temperature of a component as it passes through wave 4. Direct measurement of this temperature has been unsatisfactory. The apparatus of the drawing permits accurately timing the passage of a component through the wave 4 at various heights. With this information the parameters for various solder-wave machines can be easily correlated. The apparatus can also be used to test whether the wave is at right angles to the path of the pallet 5.

A conductive pin 6 is mounted on pallet 5 and makes electrical contact with the solder 3 as it passes through wave 4. Pin 6 is made of zirconium or other materials that are not wettable by the solder. Pin 6 is connected in circuit with the coil 7 of a relay 8 and the secondary winding of a transformer 9 and is positioned to complete this circuit to close relay 8 as it enters wave 4. The primary winding of transformer 9 is connected to the terminals 10 of a power source and the circuit of pin 6 is a low-voltage, isolated, circuit. Contact 12 of relay 8 closes to energize a timer 14 from terminals 10 while pin 6 is in wave 4.

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