Model Boat Mayhem

Technical, Techniques, Hints, and Tips => Engineering Techniques and Materials. => Topic started by: Geoff on September 03, 2018, 02:08:05 pm

Title: what type of solder
Post by: Geoff on September 03, 2018, 02:08:05 pm

I'm looking for a solder that will withstand long term exposure to 230 degrees centigrade.


Is there anything that would melt at about 330 C or am I just into the realms of silver solder?




Cheers


Geoff

Title: Re: what type of solder
Post by: john44 on September 03, 2018, 02:48:25 pm

Hi Geoff, have a look at Bernzomatic lead free solder 430 deg from Screwfix.


John

Title: Re: what type of solder
Post by: Perkasaman2 on September 03, 2018, 04:58:02 pm

I would definitely use silver solder for this joint if possible. The higher the silver content percentage in the solder the easier it is to use.

Title: Re: what type of solder
Post by: Geoff on September 03, 2018, 05:30:38 pm

Thank you for the feedback. I checked on the screwfix solder and apparently the melting point is 430 F and not Centigrade

Okay, if I silver solder what is best and what flux should I use? The joint will be very small a 4mm brass tube into a small block of brass.

Cheers

Geoff

Title: Re: what type of solder
Post by: tonyH on September 03, 2018, 06:34:25 pm

Cupalloy do a couple of low silver (1.5%) silver solders with a 305 degree melting point, fluxed or solid to suit the work. I've used it on low pressure parts of a steam setup and it flows quite nicely. :-))

Title: Re: what type of solder
Post by: Treble on September 04, 2018, 12:59:11 pm

CupSol also do a solder that melts at 305°C . Can supply you a short length if required . Trevor.

Title: Re: what type of solder
Post by: Treble on September 04, 2018, 02:10:41 pm

DURR ! ME BRANE URRTS ! Sorry about that .  Really do need to come off the happy pills . What I meant to say was Comsol solder , which from memory melts around 300°C and is/was  a Johnson Matthey product . Offer of a short length still applies . Trevor  .

Title: Re: what type of solder
Post by: john44 on September 04, 2018, 02:39:59 pm

Farnell also do a 301deg C multicore solder. Product no DHMP 18.


John

Title: Re: what type of solder
Post by: Onetenor on September 04, 2018, 11:42:09 pm

Your demand for this solder indicates a high temp piece of equipment. If the temp was to creep a bit higher under pressure could be a problem. For safety sake I would use silver solder and a flux of Borax paste. Mind you don't overheat the brass as you could burn out the zinc leaving the brass brittle/weak. While were are talking solder does anyone know of a LOW TEMP alloy solder. I repaired a crankcase with some years ago. Can't
recall the name just now but I believe there are more modern ones now.Lower temp and easy flowing but can't find it. Anyone know?


















































































































































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