Some of the slag will eventually come off naturally, some due to impact
with other objects, some due to temp changes or flexing of the project.
If you paint things, this will leave bare spots. Of more concern is that
the slag might be hiding some flaws in your weld.
henn> perhaps a silly question: Is there any drawbacks , apart from cosmetics, in
the flux will absorb moisture and then accelerate rusting.corrosion. If you
paint over the flux it wil cover then months later when the flux falls off
it will take tehpain with it. Now you have a perfect place for moisture to
reach under your paint. Once thepaint film is broken you have a mess.
As an additional note: Often with fine tuning the heat adjustment one can
have the slag almost fall off. I have not used enough self shielding flux
core to say for certain but for gas shielded flux core as well as stick
electrodes it makes a difference.
Normally you should not have to chip and hammer away. A well run bead
often only needs the point of the chipping hammer dragged across the weld
There are lots of us that would join the Union in a heartbeat!!!! I guess
though we would have to put up with Texas :')))
We are not happy with the corruption back East. Is this treason ???
I think one of the prettiest things is when you do a perfect pass with 7018,
and the slag starts to peel up before you get to the end of the stick. You
raise your hood, and the slag continues to rise up like a curling potato
Sometimes you don't even have to hit it with a wire brush.
Well, if you don't remove the slag on the cover pass and the weld is
being inspected, the inspector is going to ask that it be removed.
Might as well do it right the first time.
You are removing the slag between passes aren't you?
footy wrote in news: email@example.com:
Yes on multipass, I am very careful to get all slag of. The point about
rust promotion seems good enough to me. It´s not that much work anyway, I
can get almost all of with just a wirebrush.
Thanks for the input
Henning (not so lazy anymore)
Making slag "self-peeling" is something which welding consumable
manufacturers try to do if it is possible. It's not enetirely
accidental. The scientists working for these companies know what gives
the slag self-peeling tendency. Unless any higher priority makes you
have to use a formulation which cannot be self-peeling, they will make
it do so. The thermal expansion / contraction coefficient would be the
thing to work on, I think - make it as different as possible from that
of steel so that the slag layer breaks free on cooling.
"self-peeling" will get noticed and folk will want to buy more of your
As a last note it is interesting how some employers will tell a new welder,
" Don't waste time cleaning your welds. We have labourers to do that."
Other outifts will tell the welder to clean all welds and remove all
Cleaning your welds forces you to visually inspect the results. It is a
convenient time to repair rather than discover the fault just before paint.
Amen. When I did this for a living I was low on the totem pole, did the
cleanup and repair. One fellow left me with a nice looking vertical seam
weld. After chipping the slag, it was quite apparent that he had a nice
bead on both sides, not a speck of weld joining the two plates. It's not
nice to tattle on your fellow workers but sheesh, get him out of there!
Place was a little short on equipment so someone was always carping
about my habbit of grabbing the needed tools: 1 stinger line, 1 O/A
line, two air lines, and 2 grinders all heading off to some weldment.
Randy Zimmerman wrote:
Where I work the big tools are all painted, except for the welds which
are clear coated. Saves a lot of hassle when it's time to inspect the tool
after load testing. You can't hide anything from hundred of peering eyes!
| As a last note it is interesting how some employers will tell a new
| " Don't waste time cleaning your welds. We have labourers to do that."
| Other outifts will tell the welder to clean all welds and remove all
| Cleaning your welds forces you to visually inspect the results. It is
| convenient time to repair rather than discover the fault just before
| > footy wrote in
| >> Well, if you don't remove the slag on the cover pass and the weld is
| >> being inspected, the inspector is going to ask that it be removed.
| >> Might as well do it right the first time.
| >> You are removing the slag between passes aren't you?
| > Yes on multipass, I am very careful to get all slag of. The point about
| > rust promotion seems good enough to me. It´s not that much work anyway,
| > can get almost all of with just a wirebrush.
| > Thanks for the input
| > Henning (not so lazy anymore)