seems a manifold i made a while ago has a few rust spots on it ,not on the welds more so on the sch 10 bends happened after fitting the manifold and running it for a few weeks ,its 304 sch 10 bends i used thinking maybe it could be the metal bruch i used when i polished the manifold after i welded it up ,or is it 304 has not much chromium in it to keep rust away ,any one had experance with rust on stainless ?

 

It's you guys and your stupid wire wheels.

http://www.delstar.com/passivating.html

 

I'm sorry but are you going to start a thread for every little question you have?

 

thiink tis is the last one wasnt long ago you were asking all the questions too

 

i use a stainless wire wheel for my weld els. using a mild steel or "brass coated" wheel or brush will embed mild steel into the surface of the metal, and that is what rusts. also, if you sharpen your tungsten on a grinding wheel that sees mild steel, it can cause your welds to rust.

keep everything labeled and for a specific use to avoid cross contamination.

 

yes i think that has been my problem the wire brush must of been for mild steel ,

 

Weirtech please explain how stainless welds can rust when I grind my tungsten on a grinding wheel what sees mild steel ? Thanks.

 

What he said is you can/will get cross contamination if the grinding wheel you use to sharpen your tungsten is use to grind anything else. It's recommended that you keep a dedicated grinding wheel for tungsten grinding only, also if you use wire brush/wheels keep them labeled for alum, stainless, mild steel.

 

cross contamination is not a good thing, so why risk it? i don't even sharpen my tungsten on a bench grinder, i have a tungsten sharpener. expensive, but that is all it does and it works well and prevents any chance of embedding mild steel into my tungsten, which could potentially melt off and be deposited into a weld puddle.

 

Thanks. That is thing what I didnt know yet.

 

There is absolutely nothing wrong with using a bench grinder to sharpen your tungsten. Like I stated if you buy a brand new grinding wheel and use it for the sole purpose of sharping tungsten then there's no way you'll get cross contamination while sharpening it. If you chose to purchase a tungsten grinder that's fine, but its not needed.

 

Aaron, would you chime in on this because this is also what i have done.. the tungsten sharper is much to expensive for me at the time.. so i went to harbor freight and got a little 15 dollar bench top grinding wheel.. is that a good way to go? i only use it for tungsten..

 

lol, been doing this for years. Google it you'll see.

 

You'll be fine, just don't use that bench grinder to grind anything but tungsten.

 

This thread was really informative for me, and I'm glad it was started.

Thanks to everyone who replied. I've spent a lot of time in kitchens, and had absolutely no idea that the theory of "cross contamination" was even remotely relevant to metal work.

 

It's also because 304 is a cheaper grade of stainless. Also if you overheated the metal while welding you can boil the chromium out of it which is a main corrosion resistant alloy.

 

yes, a dedicated wheel for tungsten is fine. i never said it wasn't.

i bought a tungsten sharpener for a few reasons.
1. it is convenient to not have toget up from my work station when in the welding groove.
2. my bench grinder sees allsorts of uses, grinding mild steel, sharpening drills, so i won't use it for tungsten.
3. there is no radioactive dust with a good tungsten sharpener. i'm serious about this point: i have noticed a significant improvement in my ability to avoid getting bronchittis. i used to get it 2-3 times a year. i haven't had it since i got my sharpener. you can't put a price on your health!

yes, you can use a dedicated bench wheel for tungsten- it will not be a detriment to the quality of your welds.

 

It must be nice to be the Oracle and be born with all knowledge you will ever need.

 

Salt and water can also make stainless rust. If you live in an area with a lot of snowy roads that have been salted it's possible to get rust. It would have to be exposed for quite some time but it's still possible.

 

Never did I say I had all the knowledge I will ever need, but starting a thread a day is over board is all I'm saying. By no means am I a "oracle" of any kind.

 

Time to grow up I think try focus on your on threads mybe ,its a forum for asking pal stop spamming my thread

 

Spamming your thread? Okay pal, no problem.

 

I actually have to agree with Collin on this one. You have a lot of questions, and that's fine, but Google can answer a lot of them with a little forward work from you.

 

Well when colin started he had 3 threads asking how is his welds look weeks apart. There was nothing wrong with that and there is nothing wrong with questions like this one. Google can answer everything so then there is no point in posting here. Or you could ask those questions here as well and get this thread in google...as it is now. Then people will visit here and hopefully help this weld/fab forum grow.

 

thanks for the reply i feel its better to ask here myself just to be sure as there are some expert welders on this forum,ive learned alot on here rather than reading alot of differant things on the net.im sure collin picked up most of his input from here also