Method for making a bellows unit

Details Method for making a bellows unit Method for making a bellows unit

1981-05-01

1983-06-21

Goldberg, Elliot A.

Electric heating

Metal heating

For bonding with pressure

219 7801, 228219, B23K 1130

Patent

active

043895581

ABSTRACT:
The invention relates to apparatus and a method for assembling a thermostatic type bellows unit of the type having a cup shaped bellows housing and disposed in spaced relation thereto a corrugated cup shaped diaphragm having a rigid annular flange. The assembling involves pressure welding the diaphragm flange to the housing. The apparatus includes a bottom electrode having a chamber for receiving and supporting the bellows unit and an upper electrode having a central projection which protrudes into the diaphragm and a surrounding collar for biasing the diaphragm flange into abutting engagement with the upper edge of the housing. A suction system including a passage in the electrode projection provides a partial vacuum for drawing the diaphragm into engagement with said upper electrode projection. The chamber is then flushed with a flushing medium. A filling medium is introduced in the lower electrode chamber for filling the chamber including the space between the bellow housing and the bellows diaphragm with the filling medium. The bellows parts are then joined by pressure welding which is effected by sending a current through the electrodes.

REFERENCES:
patent: 3072778 (1961-03-01), Cook

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