Dave,Roger, this is not being used on a PCB or wiring harness, I will try to explain but it's a bit tricky. One of our "Engineers" has come up with an RTD (Resistance Temperature Device) assembly design which comprises of silver brazed peice parts (st/steel),which are then joined to a tube (brass) internally, using solder rings made out of solid 60/40 (both 20 & 18SWG) and using a flame torch to heat the parts up (this was measured at 1000+ deg.C). Added to this he has designed in HMP (221 deg. C) solder as a "sealant" around the top of the assembly to seal the rod and the tube, also soldered using a flame. Oh I forgot, he has specified Multicore "Arax" as the fluxing agent. Will these joints be reliable after seeing that temperature? I would have thought the silver braze would also re-flow at the temperatures used, would they be affected?. Is this guy crazy or is he a genius? Does any of this make any sense! regards, Pat -----Original Message----- From: Dave Hillman [mailto:[log in to unmask]] Sent: Wednesday, July 24, 2002 5:34 PM To: [log in to unmask] Subject: Re: [TN] Overheated solder alloy Hi Pat! You will have molten Sn60 solder at a temperature of 1000C! Tin boils at 2603C and Lead boils at 1750C so you won't start vaporizing the Sn60 solder alloy until you get near the 1750 C point. I just have to ask - why the concern of 1000C? Your printed wiring assembly will be quite toasty and you would have molten solder running on the floor before you reach the 1000C mark! Dave Hillman Rockwell Collins [log in to unmask] "Diamond, Pat" <[log in to unmask]>@ipc.org> on 07/24/2002 08:38:17 AM Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond to "Diamond, Pat" <[log in to unmask]> Sent by: TechNet <[log in to unmask]> To: [log in to unmask] cc: Subject: [TN] Overheated solder alloy Technetters, this may seem like a crazy question but.....what would happen to 60/40 solder alloy at temperatures of 1000 degrees C? regards, Pat Diamond Weston Aerospace ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------