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Member postings for Keith Hale

Here is a list of all the postings Keith Hale has made in our forums. Click on a thread name to jump to the thread.

Thread: Outdoor Silver Soldering
06/04/2022 09:57:20

Hi Phil,

If the problem is as you say"the burner is too big" why not use a smaller and more controllable flame?

Do you need 43kw?

Turn the regulator down from 4 bar to 2 bar the to reduce the gas consumption and heat output down to 23kw.

Alternatively buy a smaller burner eg 2941. That will give you 7kw at 2 bar rising to 14 kw at 4 bar.

Either way you will achieve more controlled heating and that means better quality of joint. You will find that you are also more comfortable. Remember that you are brazing and that requires controlled heating for the best results. It is not all about blasting heat at something. Leave that approach to the folks painting lines on the road!


Thread: Propane torch
14/03/2022 10:39:30

Hi Stephen.

Sievert will give you the best options for heating. These options are enhanced by using a variable regulator which allows you to to increase the amount of gas being burnt and increases the amount of heat generated.

This only applies to the 2000 series which is designed to run at 2 to 4 bar. The 2941 will generate between 7 and 14 KW of heat and is a good starting point.

If you want less heat, consider the 3000 series. The. 3941 burner that delivers about 3 KW with a more focused flame.

Heating is the most skilful part of a very simple process. If you want any more information on heating techniques then let me direct you to my book available from CuP Alloys or send me a pm.

Best wishes


Thread: Boiler making torch
10/03/2022 10:52:24

Hi Nick,

Sievert every time until propane heating does not fit your needs. This is likely really when you might want a more defined flame.

The mapp or map torch is ideal for a plumber. It has a slightly higher flame temperature but may not deliver enough heat because it is not burning sufficient gas.

Heating is probably the biggest cause of brazing (silver soldering) problems usually resulting in poor joints.

Look beyond the headline price. You could be heading for higher costs later.

Why not discuss your requirements with someone who appreciates and understand what you want to achieve? Try CuP Alloys.

Why ask a storeman in a plumbers shed? Alternatively read my book. Either way, you will understand enough to buy any pre-loved equipment.

But buy sievert.


Thread: Songs about Engineering
24/02/2022 12:30:52

As I recall, "an engineer told me before he died" is the first line to a song simply called "The Engineer's Song"

It features twice on an album released 1965(?) Rugby Songs Vol 2 by the Jock Strapp Ensemble on Surprise Records ILP 1012.

Looking at it now brings back a lot of memories.

Would I play it again - yes

Dare I - no!




Edited By Keith Hale on 24/02/2022 12:32:09

Thread: Citic acid
25/11/2021 19:33:20

10 gm salt/litre


Sorry can't convert that to the number of lemons!

Depends on size, moisture content, soil, Brexit, covid, number of lorry drivers and.......





Edited By Keith Hale on 25/11/2021 19:39:46

Thread: Silver soldering GLR Kennions Boiler
22/11/2021 10:38:28

Hiya Mark,

The key to successful silver soldering is capillary flow of the alloy into and through the joint.

So determine what you need to do.

Why you have to do it.

How to do it.

Then do it.

This knowledge will also enable you to evaluate any "advice" offered and further enhance your prospects of success.

Best wishes


Thread: Book Review with Christmas in mind
19/11/2021 09:22:30

Deleted - duplication!



Edited By Keith Hale on 19/11/2021 09:23:59

19/11/2021 09:22:29

Hi Baz

Thank you.

When ordering from CuP, talk to Glen/Shaun, tell them your daughter's name and request a signed copy. Over 600 copies have been sold, but only a handful have been signed!

I'll add a little more information relating specifically to jewellery making.

If you have bought it already, message me with the information and I will respond accordingly.

Best wishes


Thread: Oxy propane welding kit
23/10/2021 14:09:07

Hi all,

The demo by Helen at the Midlands exhibition was carried out using an oxy-propane kit from CuP Alloys not BOC

She did the work, I did the commentary.


Thread: Hermes and current petrol difficulties
10/10/2021 13:04:35

Quite probably!

I saw them being used in an Indonesian silversmith's workshop.

Bloody frightening!!!

But the workmanship was incredible.


10/10/2021 11:06:48

I am told that Hermes have asked if they can help with the fuel shortage.

So far they have lost 35,000 gallons, 2 tankers couldn't find the petrol station and one took a picture of the station and drove off claiming that there was no answer!

There are no reports of problems affecting model engineers using petrol fuelled blowlamps. Yet!


Edited By Keith Hale on 10/10/2021 11:08:36

Thread: HELP needed
09/10/2021 14:48:04

Hi Steve

10gm of citric acid crystals per litre of water.



Edited By Keith Hale on 09/10/2021 14:51:45

Thread: Brazing/high temp silver soldering with 999 Ag wire?
08/10/2021 09:58:42

Hi Jon,

This post baffles me!

Why would you want to make joints at 1000°C , probably using a fine hot flame (oxy acetylene?) when you can be using simpler equipment and making your joints at a considerably lower temperature.

You would also be able to use more readily available filler metal with an intrinsic value of approximately 50% of fine silver. What's not to like?

Are you simply looking for a cheaper method of making your joints?

Can you get fine silver fuse wire from say your local DIY shed? Don't try to explain what you are trying to do 😀

Find a supplier to the amateur silversmith for the rods and wire. However they tend to restrict themselves to standard or sterling silver and not fine silver. Don't expect their overheads relating to distribution to be any different!

Then follow Dave's advice.



Thread: Silver soldering stainless steel
30/09/2021 23:48:39

Hi Chas,

45T is not anything "special" but it will do the job you require.

Joint gap details and a method of attaining them are in the message.

Torch should be suitable but check in your book for the best way to heat the components to produce the strongest joint.



30/09/2021 20:16:14

Another posting with unknown provenance.

52 years in the brazing/silver soldering brazing business, I have not come across a "special silver solder for stainless steel". I have come across alloys that are suitable for ferritic stainless steel in certain conditions.

What I have come across are common silver solders being used correctly and universally on austenitic stainless steel in a wider range of conditions.

Austenitic stainless steel is non-magnetic.

In my experience, "special silver solders" are often of unknown composition, at a premium price from red and yellow boxes. Is yours the one with the pink coating? Cheaper to buy the bare rod and flux!

Before buying it, ask yourself, "Do I really know what I'm buying?"

Any problems that Chas may have are extremely unlikely to be anything to do with the alloy being used.My earlier posting illustrated!

You pay your money and take your choice.


Edited By Keith Hale on 30/09/2021 20:40:37

30/09/2021 19:17:15

Hi all,

When I can appreciate what Chas is doing, why, how and with what, then I can offer sound practical advice to resolve the difficulties. In the meantime, I don't want to add to the confusion by introducing facts that are at variance with ill founded opinion.

I am confident that the answer is in my book.

It's not bedtime reading, but it's a good source of information to achieve good, strong brazed joints.

The usual disclaimer does not apply. 😃


30/09/2021 17:18:01

Hi Chas,

See personal message.

Let's not complicate things unnecessarily.


Thread: Sizing a Burner
24/09/2021 09:00:53

Hi Matt

See personal message.


Thread: Silver soldering cast iron
03/09/2021 22:37:22

Hi Mike,

Pleased to hear of your success.

A triumph for the argument of how when using the right materials correctly in a simple process you achieve what others consider impossible.

You have a good, strong, neat joint requiring no dressing for an aesthetically pleasing result.

You have demonstrated just why the brazing process has been around for 5,000 years

Well done. I salute you.


Thread: Should silver solder be cleaned if it is ''tarnished'' ?
03/09/2021 09:20:10

Hi Brian,

If it makes you feel better, then clean it, but it's not really necessary. The tarnish is only a film of oxide that the flux will remove.

When doing a brazing demo, I might have cleaned the rod purely for a esthetic reasons.

I would use a piece of newspaper. If the silver solder contained more than than 40% silver I would use a broadsheet, if it was less, I found a tabloid satisfactory!smiley



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