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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Bimetalic domes
"Baron" wrote in message ... whit3rd wrote: On Nov 8, 6:56 pm, "Martin H. Eastburn" wrote: N_Cook wrote: I wonder how they "weld" these 2 materials together. Explosive welding. Simple as that. This might be the correct answer, but there are fill-metal/reducing atmosphere/heat solutions that might do a kind of brazing for lower cost if you get the materials right. Explosive welding is used for US coins because it was possible to mimic the electromagnetic properties of silver well enough to keep lots of vending machines in service. I've gotta believe the requirements for a thermostat bimetal system are loose enough to allow for alloys that don't require explosive welds. I was under the impression that two sheets of material were hot rolled together and the discs just stamped out complete with the dome shape. -- Best Regards: Baron. how about instead of removing material from the flat surface of the dome to remove material around the outside diameter? would that alter the point at which the dome went PING? i was just wondering if the outside edge is constrained in a bezel, if there was more room to expand there if that would alter it's temperature rating? b.w. |
#2
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Bimetalic domes
On Mon, 9 Nov 2009 16:13:19 -0600, "William Wixon"
wrote: how about instead of removing material from the flat surface of the dome to remove material around the outside diameter? would that alter the point at which the dome went PING? i was just wondering if the outside edge is constrained in a bezel, if there was more room to expand there if that would alter it's temperature rating? b.w. If there were room, one could add a preload spring to change the set point. Mark Rand RTFM |
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