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zinc coated pipe fittings are they weldable?


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  #1  
Old 10-07-2015, 03:17:30 PM
sdowney717 sdowney717 is offline
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Default zinc coated pipe fittings are they weldable?

I want to either weld or braze a 1.25 inch tee to a piece of angle iron.
I was wondering if they are cast iron or cast steel?
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Old 10-07-2015, 03:42:46 PM
fordson1 fordson1 is offline
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Default Re: zinc coated pipe fittings are they weldable?

They are steel. You can weld or braze if you need to, but do it in a well ventilated area. The white voluminous smoke contains phosgene gas... toxic.
If you can, just get some black pipe fittings instead of galvanized. If you're going to braze galvanized fittings, grind off the galvanized coating as much as you can so it won't interfere with the molten bronze flowing and sticking.
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Old 10-07-2015, 04:44:58 PM
sdowney717 sdowney717 is offline
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Default Re: zinc coated pipe fittings are they weldable?

Since they are steel, I will just weld it together. I can grind off some zinc first where the weld will go.
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Old 10-07-2015, 05:05:30 PM
dalmatiangirl61 dalmatiangirl61 is offline
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Default Re: zinc coated pipe fittings are they weldable?

Anyone have any tricks for welding galvanized steel, I grind the coating off, but it still spits and sputters, and welds look like
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Old 10-07-2015, 06:39:32 PM
Mitch Malcolm Mitch Malcolm is offline
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Default Re: zinc coated pipe fittings are they weldable?

Throw it away and buy black pipe _ when_ you get sick from that stuff it will haunt you for a long time.. wonder how I know that
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Old 10-07-2015, 07:18:49 PM
sdowney717 sdowney717 is offline
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Default Re: zinc coated pipe fittings are they weldable?

I am going to use acetylene torch. I suppose if it does not weld, I can braze. I do all my welding outdoors.
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Old 10-07-2015, 10:21:44 PM
Weld Engineer Weld Engineer is offline
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Default Re: zinc coated pipe fittings are they weldable?

Zinc causes porosity when using solid steel wire in a short arc process. MIG brazing works very well. Grind it off and use a welding process with better porosity handling like 6010 stick electrode. There are special flux core wires made specifically for welding zinc coated materials we do a lot of it in automotive applications. Coreshield 15 from ESAB, works well but fume from zinc is toxic and so is some of the smoke from special wires. Ventilation is key it makes zinc fume which will make you sick a glass of milk is the old remedy but don't risk it. Phosgene gas is not made from zinc fume it comes from some industrial gases and degreasers exposed to arc heat and uv radiation. Keep your head out of the plume.
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Old 10-07-2015, 10:50:49 PM
SoTexRattler SoTexRattler is offline
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Default Re: zinc coated pipe fittings are they weldable?

Plastic pan of sulphuric acid solution deep enough to cover the fitting. (battery acid works well)

make sure it's outside and away from anything you value.

Drop in the fittings and watch the foaming.
LOTS of hydrogen gas given off as it reacts with the zinc.

Lather, rinse and repeat if necessary.

There!... No more galvanizing!
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Old 10-08-2015, 12:33:33 AM
RobertT RobertT is offline
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Default Re: zinc coated pipe fittings are they weldable?

Quote:
Originally Posted by sdowney717 View Post
Since they are steel, I will just weld it together. I can grind off some zinc first where the weld will go.
A hardware store galvanized tee is not going to be steel. Most likely malleable cast iron, but definitely not steel, unless it's a high pressure fitting rated for steam service and I've never seen one of those galvanized.

Bob
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Old 10-08-2015, 04:31:05 AM
Greg Mosley Greg Mosley is offline
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Thumbs down Re: zinc coated pipe fittings are they weldable?

The fittings are not steel, just good old Cast Iron. Get a black iron tee and forget the galvanize. Braze it. Enuf Said.
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Old 10-08-2015, 05:43:44 AM
Alastair Geddes. Alastair Geddes. is offline
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Default Re: zinc coated pipe fittings are they weldable?

There is a simple check to see if it is cast / malleable or steel.

Just grind a bit with a grinder portable or handheld if the spark is dull colour it is cast iron or malleable.
If it is a bright spark it will be a grade of steel.
Check with known piece of steel if your unsure.
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Old 10-08-2015, 07:40:38 AM
sdowney717 sdowney717 is offline
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Default Re: zinc coated pipe fittings are they weldable?

Ok, will find out when grinding off some zinc.
This galvanized T fitting is the same thing you would find going to HD or Lowes, so that is what I have.
Makes sense to me that it would be a cast iron.
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Old 10-11-2015, 11:28:34 PM
dalmatiangirl61 dalmatiangirl61 is offline
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Default Re: zinc coated pipe fittings are they weldable?

I'll look into that flux core wire.

I know about zinc fumes, that is why I grind, but yes its not a perfect solution, so I try not to breathe it. Most of the time its just one of those situations where the only piece available is galvanized, and if the job is going to get done that is what is used.

Sometimes I want galvanized because of the application, or as in the case below, because it matches the rest of the structure, and it was available for pennys on the dollar at the scrap yard. These are the custom feet I made for the new tent in front of the warehouse, the poles dug divots in the ground on normal wind day, and in heavy winds they would splay. So we needed a way to hold the legs in place and this was my solution, cost for materials was under $20, the plates and bolts were from the power company, the pipe was unused/excess from a contractor. About the time I was finishing up a friend arrived and inspected my job, her comment was "you are so bad _ss you riveted the earth"
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Old 10-12-2015, 01:21:50 AM
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Alan Rudd Alan Rudd is offline
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Default Re: zinc coated pipe fittings are they weldable?

Standard galvanized pipe fittings are most definitely cast iron not steel.

Does this need to hold pressure or is it for a table leg or something? If need be you could get a forged steel hydraulic fitting and that will weld ok. If high strength isn't necessary I'd probably grind the galv. off and braze it.

I think the poison in the smoke is from arsenic and zinc oxide.

Alan
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Old 10-12-2015, 05:44:38 AM
sdowney717 sdowney717 is offline
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Default Re: zinc coated pipe fittings are they weldable?

This fitting will hold engine coolant at low pressures. I simply need to improvise an angle iron bracket that bolts to the engine block and holds the 'T' fitting. Coolant will come in at the top pipe screwed into the 'T', and exit at the bottom of the 'T' and move on to the radiator. The top pipe attached to the 'T' I will solder a brass fill designed to hold a radiator cap.

The middle of the 'T', I was thinking of attaching a coolant fan switch to turn on the radiator fan when the coolant gets hot.

Any ideas on a coolant fan switch that has NPT pipe threads?
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Old 10-21-2015, 05:52:58 PM
sdowney717 sdowney717 is offline
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Default Re: zinc coated pipe fittings are they weldable?

Got it brazed fine. Also joined 2 steel pipe sections into one.
Drilled and taped for 1/4 inch pipe fitting. This will receive hot coolant from water cooled exhaust manifold.




How it fits to the engine, same spot where the heat exchanger would have gone.
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Old 10-22-2015, 02:50:17 AM
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Alan Rudd Alan Rudd is offline
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Default Re: zinc coated pipe fittings are they weldable?

It looks great. Perfectly functional, I knew you could do it.

Alan
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