Ask your WELDING questions here.

[dmaxmike]

Originally Posted by JAFO

Honestly, the heat is the biggest concern. This will be in an exterior, unattached garage. In South Cackalacki. 100 degrees in the shade during the summer...

i have cut outside all day for weeks on end in direct sunlight and never had a problem. People use torch sets in much hotter places then your backyard shed like the ship yards in NC/SC/VA. Don’t worry about it people on the internet told you it was safe.

[JAFO]

Well hello, then I know it is true...

Hey ya'll watch this... I saw it on the Internet..... :-)

Sent from my MB886 using Xparent Green Tapatalk 2

[clintnz]

From my dim memory of engineering class gas storage pressure vessels usually have a design temperature of 50C/120F, then on top of that there are all sorts of other safety factors. Ask your gas supplier.

Cheers
Clint

[P B G]

Originally Posted by dmaxmike

i have cut outside all day for weeks on end in direct sunlight and never had a problem. People use torch sets in much hotter places then your backyard shed like the ship yards in NC/SC/VA. Don’t worry about it people on the internet told you it was safe.

Or drive by your local gas supply in the middle of the day. Bet they don't have their tanks in air conditioned storage, no matter where you live.

[KTM640Dakar]

Your Oxy fuel bottles are fine in the hot sun. Just dont let them leak in a closed room or car and light them. Also dont let more than 14 psi out of an acetalylene bottle or it tends to self ignite. Keep an acetelyne bottle upright to keep the acetone inside from coming out of the bottle. If you do knock it over you should give the bottle time to settle the acetone to move back to the bottom of the bottle. The bottle has a menbrane that keeps the acetone and acetelene stable and safe. Sorry no spell check.

[ivantheterrible]

i hope this hasn't been asked already--i want to use some old tin roofing for a project, but don't want to get zinc poisoning. is there a (best) way of doing this? Cross wind from a fan? respirator? ( if so, a simple vapor one?)
I've read about removing the zinc plating with acid, but this seems nearly as problematic as the zinc plating its self. i heard vinegar will work, but takes a long time.

Anyone have any experience with this? Thanks

[Wadester]

Originally Posted by ivantheterrible

i hope this hasn't been asked already--i want to use some old tin roofing for a project, but don't want to get zinc poisoning. is there a (best) way of doing this? Cross wind from a fan? respirator? ( if so, a simple vapor one?)
I've read about removing the zinc plating with acid, but this seems nearly as problematic as the zinc plating its self. i heard vinegar will work, but takes a long time.

Anyone have any experience with this? Thanks

Outdoors with a breeze works well with oxy/acetylene. Respirator with zinc fume cartridges would be safest.

The one time I wanted to clean the zinc off and away, I used muriatic acid. Takes off zinc like washing off mud. Didn't attack the steel underneath, but I did wash/neutralize it after.

[ivantheterrible]

thanks wadester.

How will I know when the zinc is gone, if I use the acid method? I know what the zinc plating looks like, will it just look like regular metal when the zinc is gone?

if I wire brush it off, how far from the weld area do i need to take off to be safe? Also, again, if i use this method, how will i know when it's gone?

Thanks again!

[ER70S-2]

I think muriatic acid fumes are as dangerous as the zinc, be careful with that crap. Outdoors during a tornado would be good.

[Wadester]

Muriatic fumes are irritating, nasty. Zinc fumes are poisonous and can cause permanent damage. Well ventilated spaces are always a good idea.

You can easily tell when the acid has taken away the zinc. Obvious color difference, plus no more bubbly mess. Wire wheel will not remove all the zinc. Grinder, maybe.

How far to clean? How big is the heat discolored area gonna be? A bit more than that. Clean a generous area. You'll need to paint/coat the area if you want rust protection anyways.

[ivantheterrible]

Can I get good results by brushing the acid on the areas to be welded? I think the size of the pieces to be welded might make finding a large enough container to soak them in difficult.

thanks again!

[WormShanks]

Originally Posted by ivantheterrible

Can I get good results by brushing the acid on the areas to be welded? I think the size of the pieces to be welded might make finding a large enough container to soak them in difficult.

thanks again!

How much welding are you going to be doing on those things? If it's not going to be hours worth I would think doing the work in a well ventilated area and keeping your face out of the fumes would be sufficient.

http://www.sperkoengineering.com/htm...Galvanized.pdf

[David R]

Originally Posted by ivantheterrible

i hope this hasn't been asked already--i want to use some old tin roofing for a project, but don't want to get zinc poisoning. is there a (best) way of doing this? Cross wind from a fan? respirator? ( if so, a simple vapor one?)
I've read about removing the zinc plating with acid, but this seems nearly as problematic as the zinc plating its self. i heard vinegar will work, but takes a long time.

Anyone have any experience with this? Thanks

Yeah, I had a bad experience with galvanized on a cell tower site. If you breathe too much of the white smoke, it gives me the shits and the shakes in the middle of the night. Only once.

I grind the galv off but. If its on both sides, it will burn off the other side too.

If you grind it, the metal will make sparks and the coating will not. A wheel made for aluminum will not load up like a wheel made for steel. There is a color difference between the coating and the steel, but its hard to see unless in good light.

Just don't breathe the white smoke!

David

[fxstbiluigi]

And don't believe anyone that tells you to drink milk "It will take the poison out of your system" That's an old wives tale.
Zinc, the coating known as galvanizing, is a heavy metal.

[Commanderkewl]

One thing about oxyfuel bottles is not overpressurizing the system.. Acetelyne will combust most easily, without a flame if the pressure is above the 10 (15 in the book, just dont run the pressure on the gauge in the red zone) psi mark.
Having the guage open a 3/4 turn is all that is needed.

Ive seen the truck with hoses over pressurized and 6 bottles go up in smoke..

Ive also seen welders run it high and not get bit....your luck will run out sometime.

Zinc- no laughing matter. Shortens your life.. Heavy metal, yes.

www.aee.vt.edu/teacher-resources/lab-safety-resources/oxyfuel.pdf