SETT ATT FRAMSTELLA EN MED ETT MEMBRAN FORSEDD ANORDNING

摘要

The invention relates to a method for making a thin walled diaphragm unit of the type used in pressostats and thermostats. The method involves attaching a ring element to one end of a tubularly shaped diaphragm element which may have the bellows forming corrugations formed thereon either before or after the attachment of the ring element. Electrodes are utilized for physically pressing the parts together as well as providing for a flow of current through the joint to provide a metallurgical joining of the parts. A layer of an alloy of phosphorous and nickel is applied to the ring element which results in a heat joining of the parts which in effect is between soldering and welding.