I find it can happen with either to low or to much current. The main
thing that make slag stick is to have crevices for it to get into. If
you run to much current there will be under cut for it to get into. If
you run to little then there will be a crevice each side of the weld
for it to stick. A smooth flowing weld on each side without under cut
will usually allow it to pop off.
The main time that I have trouble getting rid of 7018 slag is when
welding in a deep groove that doesn't have enough slope on each side.
This traps the slag making it nearly impossible to get out without a
People mentioned too high and too low heats. A highly crowned bead in a
groove creates problems. The solution in that case is to make flat beads.
Be highly motivated on this one because no matter how much you chip and
scrap along the edges of your bead the next weld will have a tough time
melting out the notch and you end up with wagon tacks.
E 7018 is very unforgiving when you try to correct a fault that was
created by the bead underneath.
Is it generally true that when slag adheres MUCH more tightly than usual on
or even 7014 that your amps are too high?
Thank you very much for that explanation. I've never had any trouble
whatsoever getting slag to pop right off 7018. On rare occasion it's
even curled up by itself.
By the way, I live in Brenham. So we're practically neighbors. Only
about two weeks ago I had a job in Huntsville and was sorely tempted to
look you up.
I was having trouble with slag sticking. I was trying to run a really small
fillet using 3/32" 7018 rod. As soon as I slowed down and let the puddle fill,
the slag sticking problem vanished. I think the too-fast travel created texture
that the slag got hold of.
Thanks to all, as usual. Great answers.
I ran several pounds today and it just took light taps to break it
free except for the deep groove which I welded. I had to work a little
harder in the deep groove but it wasn't to bad.
This is the second time you've said this. I'm confused considering
that Huntsville is 470 miles away and Brenham is 481 miles away.
That's the hardest type of weld to keep smooth. The larger welds you
automatically slow down allow to flow out properly but the tendency
with smaller welds is to go to fast. Good call on slowing down.
No problem. I'm just happy to give back to repay some portion of the
huge amount of knowledge I've gained from reading these groups.
In the 'big house maybe ?!!'
I'm not far away - in Lufkin Tx. Deep East Texas, and local neighbor to
@ home at Lions' Lair with our computer lionslair at consolidated dot net
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder
Vern> In that case, I got my wires crossed . For some reason I thought