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Thanks for the input Maui, but yes we are using helium as a shielding gas. We tried without and it did make much weaker welds.

We have access to the 3rd party welding procedure and I am told we are following it. I am told the only differences are machine maker and that we are welding horizontally while the other was welded vertically (but same angle to the object). Same laser power, same duration, same beam profile...

Sorry this is the best we have, our digital microscope is pretty rubbish.... 1 megapixel :) I've also had to cut out the weld image as the full image contains propriety information.

Here is our attempt. You can see that ours is much lighter, however a darker shade can be seen within the weld. Welding machines are very different, this is obviously the major problem, if we can figure out why the weld is darker we can tweak the settings to try and give the same strength...

Here is the 3rd party weldhttp://files.engineering.com/getfile.aspx?folder=7b8ab181-41db-4009-8859-585e5371c114&file=3rdparty_weld.jpg

Hi everybody, I am no metallurgist but I have a basic understanding of metals. We have been laser spot welding 304SS and to check out the welds I have been creating profiles of the weld. i.e. I grind down into the centre of the spot weld, polish down and then etch with marbles reagent so I can...

Spiral Wound Gaskets can not only just take higher pressures but are also more resistant to heat cycles than sheet materials. Also cheaply made sheet materials like unfilled virgin PTFE creep badly over time (especially at temperatures), perhaps your now using the SWG to rule these problems out...

Hi pipeneer, if your worried about corrosion, you can get specific gaskets that aid the joints resistance to corrosion. Flexitallic make a flange rescue gasket in an RTJ form to fight corrosion. http://www.flangerescuegasket.com/products/flange-rescue-gasket-ring-joint Pikotech also make...

Thank you ceramicguy a most helpful post. Star for you :) AbyssUK

oops sorry no I meant 500 :) typo

Hi all, I am looking at the possibility of using an advanced ceramic material in gasketing applications. I'd need a ceramic I can get in decent sized thin sheet proportions (say 5000x500x2 mm). Now I'd like it too be able to take over 150 MPa of compressive stress/crushing without fracturing...

thundair, I was just on here looking for some help myself and saw your thread. Check out Flexitallics sheet thermiculite products, for your application TH866 might be a good bet or TH896 if you need more strength. http://www.flexitallic.eu/thermiculite%C2%AE

Hello, I work in the research and development labs for a gasket manufacturer. I've been tasked with designing a new piece of equipment to test our gaskets in a 4" class 300 flange at least 800C (1472F). Now I've looked at the materials guides for the asme flanges and it has some listed...