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Old 09-27-2006, 01:57 PM
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green stuff on weld

I've been welding some pipe together for a body rotisserie and noticed several welds had dark green stuff around them. Is this some kind of copper or chromium contamination?

Conditions: Lincoln AC 7018 rods, 5/32", welded with a 'buzz-box' at 175 A, pipes: 1 rusty 2-1/2", 1 new 2", grinder used to clean both where welded.

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Old 09-27-2006, 06:50 PM
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That looks like that pipe is galvanized. Does it make yellow smoke with hairy stuff that looks like cotton candy coming off it? That is what happens when you mig weld a galvanized pipe. I would imagine it would do a similar thing when welding it with a stick.

Don't breathe the gas that it emits

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Old 09-27-2006, 06:57 PM
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yup that looks like the aftermath of welding galvanize. the fumes that are emitted are very hazerdous to your lungs and such. also don't weld anything nickle plated, that's worse.
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Old 09-27-2006, 07:01 PM
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It's not galvanized and there is no yellow smoke. Not every weld to that pipe produces that green stuff. There were no noxious odors, either. It has me stumped.

I've gassed myself cutting and welding galvanized, before. It's not something I would forget. First time it ever happened, I thought I'd die. An old, experienced weldor handed me a quart box of milk and told me to drink it all. I felt human again about half-way through it. That was from cutting galvanized floor panels with a torch inside a grain bin. Really dumb. Had yellow and white fuzzies around every cut.
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Old 09-28-2006, 09:05 AM
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Grouch, As a rule of thumb DON"T BREATH the fumes from anything that leaves a strange residue! I see in that photo a residue that could very well be, and in all probability is, either Nickel or Chromium and if so it could be very dangerous. Metal fumes fever is very serious and when you said you felt like you would die you may have been closer than you thought, it is THAT serious!
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Old 09-28-2006, 02:08 PM
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Oldred: My first encounter with fumes from torch-cutting galvanized was bad enough that nobody had to warn me to avoid it after that. That was over 25 years ago and I can still remember that feeling.

The black pipe in the upper part of that photo is new. The rusty pipe at the bottom has been laying around waiting for this job for many years. I suppose it's possible it was galvanized at some time, which would fit powerrodsmike's and matt167's comments, but it shows no evidence of galvanizing. It's evenly rusty all over and inside and out. I did my welding outside so that could explain not smelling anything or noticing strange smoke. The green stuff is mainly on the rusty pipe side of the weld, suggesting that pipe is where it comes from.

What about pipes from oil drilling? There are a few oil wells in the region and since I don't know where the pipe came from, it's possible it came from one of those. Do they do anything that gets chromium on or in a pipe? These don't look worn out, though, and I've heard that pipes discarded from oil operations are thin and brittle.

It just bugs me to not know what it is and where it came from.
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Old 09-28-2006, 02:29 PM
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It's bad to breath any kind of smoke/fumes but Nickel, chromium and Zinc are particularly bad with Zinc probably being the worst since the short exposure is MUCH more sever. This is easy to deal with and 3M,Norton and a couple of others make very good disposable welding fumes/dust masks although some of these are a bit pricey. A paint respirator works ok and I use my old expired 3M activated Carbon cartridges for welding because filtering heavy metal fumes is a lot easier than ISOs in paint so they are still good for this, seems like the prefilters remove almost all of it before it reaches the cartridges.
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Old 09-28-2006, 03:08 PM
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It just bugs me to not know what it is and where it came from.[/QUOTE]
If I did not know that...then I would not use it..as well as possibly creating hazardous fumes while welding...you also do not know anything about the strength of that material.
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Old 09-28-2006, 05:37 PM
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Should be easy enough to determine if the weld is strong enough but that's a good point anyway. Grouch, I just noticed that you said you were welding outside (I am kind of slow today ) and if that's going to be the case just keep your head out of the fumes and you should be in fine shape. Does that pipe seem softer than the other one? How about when you grind on it, any difference in the sparks?
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