silver solddering etc.

This topic has 11 replies, 11 voices, and was last updated 24 January 2018 at 11:29 by Bob Youldon.

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23 January 2018 at 23:22 #25765
Stephen Follows
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@stephenfollows82099
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23 January 2018 at 23:22 #337976
Stephen Follows
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@stephenfollows82099
I have a Rothernberger MAPP gas torch that was described as being good for brazing and silver soldering. I find that it does not give enough heat for either. Any suggestions as to what to use? Don't really want to go to the expense of oxy acetylene as I don't do a lot of this kind of work.
23 January 2018 at 23:40 #337979
nigel jones 5
Participant
@nigeljones5
Hi Stephen

For small items it should be fine, I used to use mine alot. What are you trying to solder?

Nigel
23 January 2018 at 23:58 #337981
IanT
Participant
@iant
Hi Stephen,

Someone else asked a very similar question here earlier tonight…

http://www.model-engineer.co.uk/forums/postings.asp?th=133311&p=1

Regards,

IanT
24 January 2018 at 07:27 #337989
JasonB
Moderator
@jasonb
The good for silver soldering applies to small bore tubing used for refridgeration and H&V as Rotheernberger stuff is aimed at that market eg plumbers.

When choosing a torch look at the Kw rating and not the temperature, you want around 7Kw as a general burner with the ability to fit larger and smaller burners
24 January 2018 at 07:44 #337992
David George 1
Participant
@davidgeorge1
I have a bullfinch torch works well for me

David
24 January 2018 at 08:45 #337995
Nick Hulme
Participant
@nickhulme30114
Are you using adequate refractory material under and around the work to radiate heat back at it from all sides?

A proper brazing hearth is worth several Kilowatts of torch power,

– Nick
24 January 2018 at 09:38 #338010
JohnF
Participant
@johnf59703
Plus 1 for Bulfinch I have used mine for over 40 years now, I have several nozzles but use in the main the largest and the next down, have to check the exact numbers if anyone interested!

There is some very useful and easy to digest safety & technical info on the Bulfinch site **LINK** plus as far as I know they are made in Britain so worth supporting our industry!

John
24 January 2018 at 11:01 #338032
Hillclimber
Participant
@hillclimber
Posted by JohnF on 24/01/2018 09:38:58:

There is some very useful and easy to digest safety & technical info on the Bulfinch site **LINK** plus as far as I know they are made in Britain so worth supporting our industry!

John

OK, so clickbait worked…

But what I discovered looking at the site was 'Safeflame' – generating hydrogen and oxygen supplies by electrical separation of water to fuel the burner. What a great idea.

But does it exist? Is it available in 'hobby' style price ranges? Could not find any products….

Cheers, Colin
24 January 2018 at 11:06 #338033
Keith Hale
Participant
@keithhale68713
Sievert every time! They offer the widest range of burners to suit all applications and are available with the best technical back up relating to silver soldering. If there are problems the answer ALWAYS lies behind the torch! Seek sound advice.
01909 547248 is a good place to start!
24 January 2018 at 11:09 #338035
Oldiron
Participant
@oldiron
I tried a Rothenberger Mapp gas torch before I bit the bullet and got a set of bottles from SGS Gases. The only way I could get it to do anything bigger than say 3/32" thick was to use a BIG old parrafin blowlamp to increase the heat input. Still got the Rothenberger but its only used for quick heat up and plumbing jobs.

regards

Edited By Oldiron on 24/01/2018 11:10:29
24 January 2018 at 11:29 #338038
Bob Youldon
Participant
@bobyouldon45599
Good morning Stephen,

I have to agree with CuP, the Sievert range will do most jobs, As a satisfied user from the mid sixties and having silver brazed up to and including large 5" gauge locomotive copper boilers down to fine scale steel fabrications i would not consider any other brand. I know of the Bullfinch torches but I'm unable to give an opinion and know of the Rothenberger brand, those being generally designed for specific purposes mainly associated with the plumbing, heating and air conditioning trades.

Regards,

Bob
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