[modeleng] Re: TIG welded copper boilers

Hi Alan & All,
 
A big problem comes from the term "coded welder". In truth, how many people
understand what this means? The coding of a welder to BS 287 actually
related to individual weld types, eg Fillet, Butt welds and specific
thicknesses and materials. It also relates to specific settings on the weld
plant for voltage, amps, speed, etc. Finally the coding of a welder is ONLY
applicable for the company he was coded for. Fine if your coded welder is
self employed but if Joe Blogs is a coded welder at work, the coding does
not transfer to work undertaken outside of that business, thus rendering the
rule useless!

As a boiler inspector, what matters is that the person jointing the boiler,
be it through brazing, silver soldering or a welding technique (Arc, Mig,
Tig or usually a combination of the three) is competent to do so. The idea
of samples is it allows a cross section to be cut through the weld to
examine penetration and weld quality. In my opinion, samples should be
available for all jointing techniques, including brazing and silver
soldering 

In my honest opinion, after working in the pressure vessel industry for 10
years, I would suggest that welding is much easier to perfect than silver
soldering, and that less skill is required to achieve a strong sound joint. 

Truth be told, more damage would result from the failure of a fitting, such
as a clack or safety valve, than from a joint. The joint would merely weep,
unlike a joint which would almost certainly shear. 

Regards

Craig

PS - can you tell this is a pet subject of mine!?!?!?


-----Original Message-----
From: modeleng-bounce@xxxxxxxxxxxxx [mailto:modeleng-bounce@xxxxxxxxxxxxx]
On Behalf Of Alan Stepney
Sent: 26 October 2008 09:54
To: modeleng@xxxxxxxxxxxxx
Subject: [modeleng] Re: TIG welded copper boilers

I am glad to see that the Southern Fed (and I assume other organisations) 
are allowing newer technology.

Whilst a coded welder will have plenty of experience and the training to do 
the job properly,I am not so sure about "test pieces" etc. either for steel 
or for TIG welding.
 I hope that any such pieces will be examined carefully, and that the same 
will apply to the entire boiler.

We have an excellent record regarding boilers and their failure, or lack of,

and I would hate to see that change.

Alan

----- Original Message ----- 
From: "Craig Gluyas" <craig@xxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Saturday, October 25, 2008 8:23 AM
Subject: [modeleng] Re: TIG welded copper boilers


Hi All

The guidelines for Tig welded copper boilers are already in the boiler
testing guide for the southern fed. It is simply treated as a silver
soldered boiler. The only difference being the need for either a coded
welder with documentation, OR for a test piece to be available for
examination to prove the welders competence (which is exactly the same as
for steel boilers) I.e. you do not have to be a coded welder to manufacture
one, just a competent welder.

Tig welding is a very accurate and precise form of welding, well suited to
this kind of work. The only limitation I can see is getting the torch into
some of the tighter areas! It does save heating the whole boiler up for
silver soldering and then also the pickling process.

As a club boiler inspector with experience in designing and manufacturing
pressure vessels in both steel and stainless steel (usually TIG welded
construction) I'm very glad to see the technology being utilized and
accepted in the hobby.

Regards

Craig

-----Original Message-----
From: modeleng-bounce@xxxxxxxxxxxxx [mailto:modeleng-bounce@xxxxxxxxxxxxx]
On Behalf Of R.L. Roebuck
Sent: 24 October 2008 23:37
To: modeleng@xxxxxxxxxxxxx
Subject: [modeleng] Re: TIG welded copper boilers

Hi there Alan,

I'd be curious to know what the Southern (or Northern) Federations view
point is - will they issue boiler certificates for them, and will the
testing still be one hydraulic test every four years?


Yours,


Rich.


On Fri, 24 Oct 2008, Alan Stepney wrote:

> I see that Maxitrak have started selling TIG welded copper boilers.
>
> Anyone have any thoughts on that, instead of the usual silver soldering?
>
>
> Alan
> MODEL ENGINEERING DISCUSSION LIST.
>
> To UNSUBSCRIBE from this list, send a blank email to,
> modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject
line.
>
MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to,
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject
line.

















































































































































































MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to,
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject 
line. 

MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to, 
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject
line.



























































































































































































MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to, 
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.

Other related posts: