Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1974-12-04
1976-02-24
Tupman, W. C.
Metal working
Method of mechanical manufacture
Assembling or joining
29591, B01J 1700
Patent
active
039395545
ABSTRACT:
A surface thermocouple assembly including a metal sheath having thermocouple conductors extending therethrough in spaced relation from each other and from the sheath by electrical insulating material, an opening in the sheath wall at the hot junction end and through which the conductors are extended, a ceramic plug receiving the conductors and mounted in the opening, a fusion weld of the conductors outside the plug, and a V-shaped pad with a knife-shaped edge integrally formed at the junction end. The thermocouple is made from a length of sheathed thermocouple conductors by forming a keyhole slot at the junction end, removing the insulation around the conductors, bending the conductors through the opening of the keyhole slot, mounting a ceramic plug in place, fusion welding the ends of the conductors outside the plug to define the thermojunction, inserting a metal end plug at the junction end, welding closed the slot and the end plug in position, and building up a V-shaped welded pad at the hot junction end. Thereafter, mounting of the thermocouple assembly onto a surface for which the temperature is to be monitored includes the positioning of the hot junction end onto the tube with the knife-shaped edge of the pad in engagement with the tube, and providing void-free welds between the pad and the tube such that the distance between the thermojunction and the tube surface is substantially less than the distance between the junction and the closest free surface of the mounting welds.
REFERENCES:
patent: 3069752 (1962-12-01), Sherning
patent: 3143439 (1964-08-01), Hansen
patent: 3466200 (1969-09-01), Mellor
patent: 3477122 (1969-11-01), Hamrick
patent: 3553827 (1971-01-01), Baker
Thermo-Couple Products Company, Inc.
Tupman W. C.
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