locoboy
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 posted on 28/10/04 at 01:25 PM |
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sooty deposit when welding
Hi all,
I had a crack with the welder last weekend - my first go might i add. Practiced for about an hour and by the end i would say that 50% of my welds were
acceptable visually and in terms of penetration and strength.
However..... if i try to tack weld anything i get a sooty deposit around the tack (this is the same when i finish a normal weld run too). is this
normal?
If it is normal, does it need cleaning off with a wire brush before i try to weld over the top of it?
Many thanks
ATB
Locoboy
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locoboy
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| posted on 28/10/04 at 06:32 PM |
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come on chaps, about 90% of the reguar posters on here will know exactly what i am talking about and will have experienced the same thing at some
point.
any anwsers yet? - please!
ATB
Locoboy
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theconrodkid
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| posted on 28/10/04 at 06:43 PM |
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sounds like something on the metal,its not galvanised is it?
who cares who wins
pass the pork pies
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Surrey Dave
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| posted on 28/10/04 at 07:00 PM |
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Have you got a good flow of gas when welding , 'cos when the gas runs out the welding tends to look sooty and cruddy, and no thats not a new
childrens TV prog.......
[Edited on 28/10/04 by Surrey Dave]
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blueshift
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| posted on 28/10/04 at 07:08 PM |
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I get a bit of a sooty deposit around my tack welds too sometimes. generally the welds fairly often end up with some kind of black / brown / grey
dusting around them that wipes off with a finger. I don't really worry about it.
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locoboy
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| posted on 28/10/04 at 07:21 PM |
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cheers guys, it was outside fo it could have been the gas blowing away a little.
Blueshift, do you just weld over the top or wipe it off?
Conrod, its just erw non galv cleaned with a grinder.
ATB
Locoboy
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JoelP
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| posted on 28/10/04 at 07:25 PM |
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i get discolouration, but not what i would describe as soot. Comes off with wire brush, and i weld over it if required. No apparent probems for me,
but an experienced welder might know more.
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Mark Allanson
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| posted on 28/10/04 at 08:42 PM |
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Does the steel have a protective film of oil?
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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locoboy
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| posted on 29/10/04 at 07:53 AM |
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No mark, its ERW that has been in my outdoor shed for months so has surface rust, gave it a belt with the grinder then away i went.
ATB
Locoboy
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blueshift
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| posted on 29/10/04 at 10:02 AM |
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Mine probably has a bit of original oil / wd40 / rust on it. I give things a wire brush before I weld them if they look mucky or if I'm feeling
keen and don't forget.
If I'm welding again in the sooty area I'll give it a quick scoosh over with a wire brush, though I have welded through it once or twice
and don't remember any obvious effects.
The only thing I'm not happy about now with my welding is that occasionaly for no reason I can understand, the weld goes crackly and bubbly and
lays down porus "shells" instead of a nice molten bead. It has happened welding outside which I attribute to gusts of wind, but sometimes
inside as well, at the beginning of a weld. hum.
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locoboy
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| posted on 29/10/04 at 10:25 AM |
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Blueshift,
I have managed my fair share of 'aero' style welds too but seeing as all my welding was done outside it was probably the wind - well
thats my excuse anyway 
ATB
Locoboy
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