Member postings for peter walton

I dont think there is a generic answer to this question as there are many many types of bronze!

In the 60's I spent many years in the copper industry where we made copper alloys and bronzes and in most case the only quick way was for our sampler to drill a piece and he could usually tell what the generic alloy was. He accomplished this by drilling into the sample with a half inch drill in a drill press. If the sample was brass then the colour would show the alloy and the hardness if it was a bronze but only analysis could definately determine the alloy.

Although some brasses with high tin as an impuruty would be as hard as nails so the drilling would fail but in the end analysis is the only true way.

You can now get hand held xray fluorescence machines that will show the alloy, a bit out of HSM range cost wise.

Sorry for the pessimistic tone but it really is a mine field on alloy determination.

see link http://www.spectro.com/pages/e/p010602_spectro_xsort_video.htm

Peter

Edited By peter walton on 16/03/2012 18:34:18

Not to sure about free speech being compromised

more of 'he who pays the piper calls the tune'

peter

I think the video is showing that the larger the surface area of the scrap Ally the less you will get in the actual melt due to the surface oxidising.

This is why ally turning have so little scrap value, to high an oxidxe content.

peter

Found another one and it seems to be active

http://clocksandbarometers.com/index.php?main_page=product_info&cPath=40_43_74&products_id=765

Peter

Try this a bit cheaper

Forget this - page was from 2005 - not listed as supplying now!

Peter

Edited By peter walton on 23/02/2012 09:50:19

Edited By peter walton on 23/02/2012 09:53:04

Just heat the part to be joined and apply till enough was melted, not seen it lately.

Mind you it was 30yrs ago!

Peter

Edited By peter walton on 19/12/2011 09:53:59

It would appear that Cadmium is sometimes added to Gold to make jewellry which could answer something that has had me puzzled for some time, in that some people are allergic to Gold jewellry which I always thought was non toxic.

As to the OP question , I dont think there is a simple test for Cd.

peter

Rust will form when the temperature drops and any steel objects will be the coldest object around so any water in the air will condense on them. You could also add a low wattage lamp under the covers as this will help in the temperature changes.

Also put plenty of oil on them sort of belt and braces approach.

Peter

Also shrinkage can be upto 30% so have to take that into account.

For real jewelary I cannot see it replacing the lost wax process, as once you have the equipment the casting is not that difficult and you only need a gas torch.

Peter

For such a naff program with so little usefull content why does it take so many 'back room' bods :-

Production manager
Production Coordinator
Reasearcher
Production Team of 6
Off line editor
On line editor
Dubbing Mixer(or is it down)
Producer
Production Associate
Head of Production
Executive Producer
Executive Producer for BBC
Series Producer
and a Produced and directed by

Edited By peter walton on 22/02/2011 18:24:47