Dont apologise....its a minefield.........I was part of it for 40 years
317 Stainless?....thats quite specialised........chemical tankers?
Yes, obviously I have never done X Rays however I have done quite a few chops/etches and don't see much in the way of porosity. Having said that I did get some in the tests the last day with the Cebora, not sure what wire it was as it didn't have a name on it but the supplier said he reckoned it was SWP. Can't say for sure whether it was the wire that was the problem though as I was using a burnt shroud and possibly had too much flow for the small torch, hopefully I can do some more tests next week to see if I can find the problem.
This was the one the last day, was happy enough with the profile and penetration (the wee Cebora is impressive ) but mightily pee'd off when I saw the bubbles
As said I have not found the issue yet for sure but the wire is the prime suspect.
You always get porosity with Aluminium welds....its the quantity that varies
it always is
It is very rare that I see porosity in an etch, I am sure it will be there but it is not really visible to the naked eye or at least not to me. I did once get plagued with a porosity problem that was driving me daft but I eventually traced it to a tiny pin hole in the gas hose.
Aluminium always has porosity..........thats a fact
What are you talking though? Big bubbles as above or tiny ones that can hardly be seen?
I have on occasion seen some close to the surface but the one above dismayed me because they were deep down.
both or either............Aluminium attracts moisture to its surface.....so unless its perfectly clean there will be porosity........and you cant really clean it to that level....except in certain circumstances
If you dont believe me....google it.....I havent so I dont know what you will find
Oh I believe you as I know it to be true as well but when I see ones like I posted above I am not happy, normally the etches are nice with very tiny bubbles if at all.
This is what I see normally.
On occasion I do see some bubbles such as here which was done with a spool gun with Super6 wire on the Cebora and I was having gas coverage issues as can be seen in the last pic.
well done....they look good
You seem to be getting me wrong, I am not disagreeing with you as I know it is true, I am simply trying to get a handle on what to normally expect.
and thats what Im trying to tell you......having seen hundreds of graphs
So to furthe my question a little could someone explain to me what the wire coding means so what does er70s-6 mean?
What wire should I be looking at for fabrication and general repairs?
Do a google search for mig wire code and you should get info on it, for example here is one I just got by doing that.
Good morning Hood.
I have my sample of welds put down on a flat plate of alli with Safra 5356 1.2mm, and I agree no bubbles at all in all the welds put down. However when I did my alli weld test fillet and overhead butt weld, in the fillet there was porosity. Had the results emailed back to me from the testing agent which stated it was a class 2 weld and that class one is not obtainable with mig process due to the porosity. They stated that they look at the size and location of the porosity to determine the weld quality. They gave me no problems
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