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unknown stainless steel

General welding questions that dont fit in TIG, MIG, Stick, or Certification etc.

Re: unknown stainless steel

Postby Olivero » Tue Mar 14, 2017 6:29 pm

exnailpounder wrote:316 is common for marine applications and supposed to be used within 5 miles of an ocean coast. 304 is about the cheapest so you can see why manufacturers would favor it. I wonder what stainless appliances are made of...betting 400 series.


Higher quality stainless appliances are 304 from what I see, most of them aren't magnetic.

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Re: unknown stainless steel

Postby exnailpounder » Tue Mar 14, 2017 7:21 pm

Olivero wrote:304 is the standard kitchen grade.

The main difference between 304 and 316 is 316 has molybdenum added to it which gives it an acid resistance and so allows it to stand up to more nasty stuff.

If you'r looking to do cool little gifts like that, stainless countertops should be just fine, most likely they are 304, rarely will they be 316. You probably just want the corrosion resistance malleability of stainless for your ideas which it should offer.

Stainless welding is fairly easy, just be careful with cooking it, once stainless gets hot and molten, it tends to float some materials around which can prevent the oxide layer from building on the surface of stainless. This happens due to the chrome in it. Once metal has more than 18% chrome (Or something similar) it is considered to be "stainless" as the chrome will protect it.

I could go on for hours, I am trying to stay on track.

BUT! Most importantly, make sure you leave the torch with its postflow over the weld once your weld is done, give it a good 5-10 second post flow to allow the weld to cool with a shield over it and then your good to go, by removing it too fast you can contaminate it and once again, prevent the oxide layer from rebuilding.

By the way, that oxide layer rebuilds naturally once the chrome surface is in contact with oxygen that's why there is such a stress on not contaminating stainless, dedicated brushes, grinding wheels, etc.

Sounds like a great idea though, I think they will be happy. Are you planning on painting any of this stuff? Stainless is very good at getting discoloured after welding which ruins the aesthetics but there are ways to handle it, just depends how far you want to go.

There, I feel better now that I got to babble :lol:

You were babbling? :lol: Sounded good to me...I just think maybe you need some trim...that'll shut you up for awhile :lol: :lol: :lol:
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Re: unknown stainless steel

Postby Coldman » Tue Mar 14, 2017 7:27 pm

316 filler is cheaper than 309 or 312 fillers and will weld any combination of commercial 300 and 400 grades that you are looking to do.
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Re: unknown stainless steel

Postby Olivero » Tue Mar 14, 2017 8:04 pm

Im pulling my foreigner card, what's a trim?
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Re: unknown stainless steel

Postby exnailpounder » Tue Mar 14, 2017 8:06 pm

Olivero wrote:Im pulling my foreigner card, what's a trim?

:lol: Google it. I bet all the old timers know what trim is...or used to be :lol: Or look up poontang...same thing
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Re: unknown stainless steel

Postby Olivero » Tue Mar 14, 2017 8:13 pm

exnailpounder wrote:
Olivero wrote:Im pulling my foreigner card, what's a trim?

:lol: Google it. I bet all the old timers know what trim is...or used to be :lol: Or look up poontang...same thing


Lol. Had to look for Trim in slang dictionary :lol: :lol:

Doesen't keep me quiet for long :lol:
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Re: unknown stainless steel

Postby Poland308 » Tue Mar 14, 2017 8:16 pm

Sometimes to trim something you just( tear a piece off.) ;)
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Re: unknown stainless steel

Postby exnailpounder » Tue Mar 14, 2017 8:41 pm

Olivero wrote:
exnailpounder wrote:
Olivero wrote:Im pulling my foreigner card, what's a trim?

:lol: Google it. I bet all the old timers know what trim is...or used to be :lol: Or look up poontang...same thing


Lol. Had to look for Trim in slang dictionary :lol: :lol:

Doesen't keep me quiet for long :lol:

Me neither...when I get some I whine to get more...probably embarrassing but I don't notice :lol:
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Re: unknown stainless steel

Postby Olivero » Tue Mar 14, 2017 8:52 pm

Hahaha.

now that we settled that :lol:

Do you know if you have to repassivate stainless after any welding regardless? From what i know you can loose the corrosion resistance if its cooked too much but I believe that if you don't overcook you can get away with just cleaning it up?

Got any info on that one? Always wanted to know if I should feel bad for leaving a stainless weld un-passivated.
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Re: unknown stainless steel

Postby exnailpounder » Tue Mar 14, 2017 9:01 pm

Olivero wrote:Hahaha.

now that we settled that :lol:

Do you know if you have to repassivate stainless after any welding regardless? From what i know you can loose the corrosion resistance if its cooked too much but I believe that if you don't overcook you can get away with just cleaning it up?

Got any info on that one? Always wanted to know if I should feel bad for leaving a stainless weld un-passivated.

I repassivate on sanitary welds. Rub In some Barkeepers Friend, takes the colors out and makes the welds look like natural stainless...allows the oxide layer to reform. Highly recommended. For non-sanitary...let your conscience be your guide.
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