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Old 09-29-2011, 02:50 PM   #1
Kustom7777
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Default anyone know an easy way to remove the galvanizing from emt?

does anyone know of a way to remove the galvanizing from conduit other than grinding it? is there a chemical process or some other method that would work effectively? thanks,,,,,
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Old 09-29-2011, 02:54 PM   #2
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Muriatic acid (pool acid). Gloves, glasses and outdoors! Will smoke and fizz like CRAZY and when it stops, you'll have nice raw metal. Works like a champ.
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Old 09-29-2011, 02:56 PM   #3
OLLIN
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Default Re: anyone know an easy way to remove the galvanizing from emt?

uh oh! what could he be up to now...?
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Old 09-29-2011, 02:56 PM   #4
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Don't breathe the fumes. I bet they're zinc-y and bad for you.
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Old 09-29-2011, 03:14 PM   #5
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Default Re: anyone know an easy way to remove the galvanizing from emt?

I was bored, so I did a quick sample for ya. Did I mention fumes? Very bad.
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Old 09-29-2011, 03:29 PM   #6
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Im assuming you want to remove the galvanizing to weld it. I came across this online, I didn't read the whole thing, and im not sure how true it is, but I'm pretty sure it says welding galvanized steel has no long term affects on you, and it's not as bad as most people think.

http://www.sperkoengineering.com/htm...Galvanized.pdf
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Old 09-29-2011, 03:29 PM   #7
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Dont store it in an open container inside your shop, it will turn all your tools in your toolbox and any other bare metal orange with rust by morning, just from the fumes. I'll never do that again.....Scott
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Old 09-29-2011, 03:50 PM   #8
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Quote:
Originally Posted by thesupersized View Post
Im assuming you want to remove the galvanizing to weld it. I came across this online, I didn't read the whole thing, and im not sure how true it is, but I'm pretty sure it says welding galvanized steel has no long term affects on you, and it's not as bad as most people think.

http://www.sperkoengineering.com/htm...Galvanized.pdf
You may want to read the whole thing before you say it ain't bad for you. Do you really trust your life to an article on the internet?
From your article:
Typical “metal fume fever” begins about 4 hours after exposure, and full recovery occurs within 48 hours. The symptoms
include fever, chills, thirst, headache and nausea. All of these symptoms, pain and suffering, as well as lost work (and play)
time, can be avoided entirely by simply not inhaling the zinc oxide fumes. This can easily be done using any of the
methods described later.

To complement proper positioning, a fully effective method to preventing inhaling zinc fumes is to wear a suitable respirator
(mask). Some of the commercial products which are suitable are:

Masks that are not properly fitted will not be effective in protecting the welder since the zinc oxide can be pulled through any
openings between the mask and the welder's face. Welders who are given masks or any other kind of personal protection
equipment have to be trained how to adjust them so that they work correctly. In addition, OSHA regulations (29CFR Part
1910.134(b) requires that fabricators have a written procedure for use of personal protective equipment such as respirators and
masks; that the equipment be selected from that approved by the Mine Safety and Health Administration and the National
Institute for Occupational Safety and Health; that the equipment selection be based on the hazard to which the welder is
exposed; that only employees who are physically capable of doing the job and know how to use the safety equipment are
assigined to perform work; that respirators are cleaned and disinfected regularly, stored in a convenient, sanitary location and
kept in good repair; that the work area be monitored for changes in exposure; that the medical status of employees is
reviewed regularly; and that the program be reviewed on a regular basis to appraise its effectiveness. OSHA does not
currently require periodic medical evaluation of employees, but that is under consideration. Disposable masks eliminate
some of the hassle associated with meeting these OSHA regulations.
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Old 09-29-2011, 03:50 PM   #9
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Save the old Black acid in a
closed jam
if you have to solder or tin some bare steel
it will do the job.------TwoChops
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Old 09-29-2011, 05:51 PM   #10
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Get a piece of vinyl rain gutter, ( the length to hold your EMT), and cover the EMT with the strongest vinegar you can buy........................Works well, if a little slow, check it in a day or two, and swap out the vinegar if it's progress slows or stops.
And do it outside.
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Old 09-29-2011, 07:54 PM   #11
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Quote:
Originally Posted by stealthcruiser View Post
Get a piece of vinyl rain gutter, ( the length to hold your EMT), and cover the EMT with the strongest vinegar you can buy........................Works well, if a little slow, check it in a day or two, and swap out the vinegar if it's progress slows or stops.
And do it outside.
Agreed I've done it and didn't have an issue welding on the metal. But let it sit for a good bit, and rinse rinse rinse
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Old 03-16-2013, 07:56 AM   #12
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Why use anything galvanized? What cha up to? LOL. Lippy
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Old 03-16-2013, 08:48 AM   #13
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Default Re: anyone know an easy way to remove the galvanizing from emt?

I was just looking at conduit to make the structure for my tilt front end and thinking of a way to get rid of the galvanizing.
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Old 03-16-2013, 09:01 AM   #14
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Default Re: anyone know an easy way to remove the galvanizing from emt?

I know conduit is cheap but why not buy tubing the same size. If you need to remove the zinc where you want to weld heat it with a torch and brush it off. We generally put a fan close by and blow the fumes away.
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Old 03-16-2013, 09:18 AM   #15
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Default Re: anyone know an easy way to remove the galvanizing from emt?

braze it and dont inhale, it brazes real easy

other choice steel tube and wire feed

JMHO
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Old 03-16-2013, 10:31 AM   #16
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Default Re: anyone know an easy way to remove the galvanizing from emt?

I don't think that all EMT tubing is galvanized, shop around.

Bob
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Old 03-16-2013, 10:45 AM   #17
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Quote:
Originally Posted by swade41 View Post
I was just looking at conduit to make the structure for my tilt front end and thinking of a way to get rid of the galvanizing.
that's very light tubing to make something requiring structural strength.

by the time you get that coating (partially?) off and figure your time is worth anything, you could buy some steel tubing as suggested above and be further ahead.
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Old 03-16-2013, 11:08 AM   #18
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Anyone mentioning EMT and hot rod in the same sentence makes me nervous. One of my criteria of a 'Redneck engineered' car includes the use of galvanized tin and tubing....
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Old 03-16-2013, 11:21 AM   #19
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Quote:
Originally Posted by Weasel View Post
Anyone mentioning EMT and hot rod in the same sentence makes me nervous. One of my criteria of a 'Redneck engineered' car includes the use of galvanized tin and tubing....
I'm with ya on this one Weasel. Seems the discussion is going in the wrong direction. There should be a fab shop (hot rods, race cars, agricultural, etc.) within a short distance of everywhere to get the proper material for this job. Don't cheat with your safety, use the right stuff. Especially on a cool project like this one.
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Old 03-16-2013, 11:30 AM   #20
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Jim the best and least lethal way to use Conduit [traditional Kustom method of construction BTW]....Is to use a coarse Cup style wire brush on a hi speed angle grinder and just bear down and burn it right off.
It does a nice job and you should use a good dust mask while doing that.... it works well and is la lot less mess.....
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Old 03-16-2013, 12:09 PM   #21
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Quote:
Originally Posted by iwanaflattie View Post
Hey guys.
I've read about the dangers of welding galvanized So I googled for a welding mask that could help with the fume problem but also that Is not bulky to wear under a welding helmet.
I found this:http://multimedia.3m.com/mws/mediawe...9925DS.pdf,but it looks like it's only available in the UK.
Anyone know how to get it in the usa?
thanks.
Also this would be great for welding inside the cab etc.
Better to use a powered respirator that sucks air through a filter and puts it in a mask under pressure so you don't suck fumes around the mask.
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Old 03-16-2013, 12:11 PM   #22
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Default Re: anyone know an easy way to remove the galvanizing from emt?

EMT is a lot stronger than you might think. We used to make Go-karts out of it that would run 70-80 MPH and never had any problems.
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Old 03-16-2013, 12:35 PM   #23
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Default Re: anyone know an easy way to remove the galvanizing from emt?

As it is cheap and lightweight and available most all places-It was always used in some early Kustoms as a form of fabricating shaped bodys -panels,wheel well flares etc- back in the day.......It was never intended as all out structural tubeing,we all know that,.....
Its great for understructure ,for body bracing,fender supports etc-,but used as any sheetmetal/structural member in itself the welds can easily be corrupted by poor removal of that Galv' coat, so be careful in that reguard as well as the health hazard discussed....
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Old 03-16-2013, 12:59 PM   #24
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Quote:
Originally Posted by Weasel View Post
Anyone mentioning EMT and hot rod in the same sentence makes me nervous. One of my criteria of a 'Redneck engineered' car includes the use of galvanized tin and tubing....
Plus EMT has a very thin wall, easy to bend on electrical installation sites. I sure wouldn't use it on a car.

I saw some dipshits years back weld a fuel cell guard on the rear frame of a stock car made from EMT tube.

Bob
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Old 03-16-2013, 01:06 PM   #25
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Default Re: anyone know an easy way to remove the galvanizing from emt?

If you aren't in a hurry to remove the zinc, dip it in Diesel fuel. After a couple of months, the zinc/diesel will be a gooey mess and the steel will be clean. No fumes.
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Old 03-16-2013, 06:00 PM   #26
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Quote:
Originally Posted by gatz View Post
that's very light tubing to make something requiring structural strength.

by the time you get that coating (partially?) off and figure your time is worth anything, you could buy some steel tubing as suggested above and be further ahead.
I know quite a few race cars that use it for tilt front under body bracing. You bond it in with mat and resin so the coating makes sense because it will not rust. I'm not standing the car on it's hood, it just has to hold it in place.
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Old 03-16-2013, 06:22 PM   #27
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Quote:
Originally Posted by Weasel View Post
Anyone mentioning EMT and hot rod in the same sentence makes me nervous. One of my criteria of a 'Redneck engineered' car includes the use of galvanized tin and tubing....
Jim ain't building a hotrod, he's building a Kustom. I use it a lot to brace stuff, frame out grills, tail lights, etc. Starbird also uses it to frame out his custom bodied bubble top cars. he tried to buy it from the manufacturer, un-galvanized, but they refused.
Also works well as a quick form to hammer metal over.
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Old 03-16-2013, 11:59 PM   #28
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Many paint don t hold very well on galvanized parts IIRC.
Use at least epoxy or a good etching primer.
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Old 03-17-2013, 12:12 AM   #29
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Quote:
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Why use anything galvanized? What cha up to? LOL. Lippy
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Old 03-17-2013, 09:12 AM   #30
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Default Re: anyone know an easy way to remove the galvanizing from emt?

This is an old thread.....I'm sure Jim was looking for an easy way to frame/support the radical body changes on his "Telstar" project. And conduit is a good way to do this, quick and easy compared to other methods.
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Old 03-17-2013, 09:25 AM   #31
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Only two ways to do it. Sandblast or chemically strip it. Grinders or course sanders/wire wheels will clear off some of the coating but will also embed it deeper into the base.

Done right conduit can be used to build a tilt front end structure but I'd have to agree by the time it's all said & done, buying thin wall steel tubing is the best way to go.
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Old 03-17-2013, 09:26 AM   #32
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Default Re: anyone know an easy way to remove the galvanizing from emt?

Chopolds, we are surrounded by folks who know it all without ever having done anything......
A look back thru about any of the old books will show you conduit was used on a lot of early customs as substructure.
we all know its not used to build a frame ,for Gods sake,it wasn't even hinting at that.
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