Avoneer
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| posted on 21/3/07 at 10:16 PM |
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Welding Galv
Can you just MIG it or do you have to grind back to clean metal?
Cheers,
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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RichardK
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| posted on 21/3/07 at 10:20 PM |
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I welded it ok, just didn't breath in the fumes 
Probably is quite bad for you but wasn't told about the fumes afterwards.
There is the possibility that my mate was scare mongering so I'll be interested in the future comments.
Regards
Rich
Gallery updated 11/01/2011
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Gav
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| posted on 21/3/07 at 10:20 PM |
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Id grid it back first pat, iirc welding galv gives of cynenide(?) or so other rather unpleasant gas, make sure your well ventilated!
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sydders
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| posted on 21/3/07 at 10:27 PM |
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It gives off zinc oxide I think, and I remember some years ago when I did quite a lot of welding on galvanised sheet, too much fume sniffing resulted
in a major bellyache but nothing any more serious than that. Best advice would be to grind the weld area, taking care to avoid the dust as well, and
touch over the welded area with aluminium paint to rust proof.
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Wadders
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| posted on 21/3/07 at 10:42 PM |
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Was always told to avoid galv fumes as they're
highly carcinogenic. 
Mind you, what fumes are good for you, i don't know many tradesmen that live to a ripe old age, especially welders. We used to get a free pint
of milk each day  Like that was going to magically protect us from the deadly fumes, What a load of shi#e
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jambojeef
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| posted on 21/3/07 at 10:45 PM |
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You have to grind (or better still sand with a rotary attachment on your angle grinder) the area you want to weld to plus an inch or so - and where
you plan to attach your earth clamp.
You still might find it doesnt weld very nicely - I have never had much success with welding galv
So hope it works better for you than it has for me!
Geoff
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Peteff
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| posted on 21/3/07 at 10:51 PM |
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Weld it outside and it should be alright. It makes yellow fluff type deposits if you don't grind it off. Zinc or any metal oxide inhalation
causes metal fume fever which is like flu symptoms.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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oadamo
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| posted on 21/3/07 at 10:56 PM |
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you can weld it as it is but you will get a lot of bubbles/pinholes its better to grind back. if you breath it in you get whats know as welders flu
buy a pp3 throw away mask
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owelly
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| posted on 21/3/07 at 11:00 PM |
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Welding galv is bad. Grind the metal back to shiney and then a bit more just to make sure. Any galv in the weld pool will weaken it. The fluffy
powderey fumes make my fillings itch and makes me cough up bits of lung.......
http://www.ppcmag.co.uk
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ScotJebus
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| posted on 21/3/07 at 11:32 PM |
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Teachers are college say ya get what they call galvy flu and its not nice
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Chippy
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| posted on 21/3/07 at 11:54 PM |
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Agree with all said above. After welding touch up with Galvafroid, (think thats right) excelent stuff. HTH Ray.
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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locogeoff
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| posted on 22/3/07 at 12:08 AM |
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Well dodgy if you ask me! Wouldn't do it again. I was ignorant and felt like sh1t afterwards
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rebelrider
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| posted on 22/3/07 at 02:20 AM |
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what is it that your welding ? if is hiden away and doesnt have load on it just blast it as it is.
but if it has load on it dont do it without grinding it off first the galv causes perosity in the weld (doesnt allow your shield gas to protect and
will be like welding with your gas off) so the weld will be much weaker than normal.
or...... if your worried about the fumes get a mate round tell him you can weld galv is he any good at it and men being men will say yeah let me have
a go. job done lol
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BenB
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| posted on 22/3/07 at 11:31 AM |
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As previously said, zinc oxide comes off....
Good for curing nappy rash in babies, not so good when you inhale it....
Gives you a banging headache in small quantities, flu like symptoms and abdo grumbles in larger quantities.
Poisonous if you eat it (like when people make BBQs out of shopping trolleys or baskets.....)...
More importantly(!), the welds get contaminated with it and turn out pretty crappy. Better to grind it off properly before doing the welding....
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blueshift
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| posted on 22/3/07 at 05:57 PM |
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Yes the zinc fumes give you flu-like symptoms, and the milk is for a reason: drinking cold milk cures welder's flu!
relayed info from people who actually know what they are talking about, the topic has come up in the past.
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