Hey fellas! have a question on dual sheild. Some times i'll run a weld and chip the slag off and ther is a little worm trail on the weld, not a hole like porosity but a little trail like something was trying to come out to the surface but didint make it all the way. Just trying to avoid this problem.
p.s. every joint is clean of all paint, rust ect. Thank for the help
I have had dual shield do that when using a spool that had been sitting around for a long time or when the piece got to hot, not from the machine settings but from welding too many passes without sufficient cooling time, which is pretty easy to do with dual shield.
Hello bbwinc, try doing a search of the forum, there have been lengthy conversations on other threads concerning the issue that you are asking about. To generalize however, one major factor has been moisture that has found it's way into the flux core of the wire. Flux-cored wires have 3 basic designs for their construction, they have a butt type seam, they have an over-lapped seam, or they have a bead-locked type seam. The bead-locked seam appears to provide the best resistence to moisture contamination and thus shows less issues such as the defect that you have referred to. So, in conclusion, be sure that you have fresh wire that hasn't been sitting around for countless time which would allow contamination. If it's used wire that has been taken off of a machine and stored somewhere be sure that it has been stored properly(properly stored would probably take some defining), likely it means in a sealed enclosure or container and better yet one that was heated to keep moisture from collecting. Finally do a bit of homework and try to determine if the wire was manufactured with the bead-lock type method as this might increase the time that the wire could be left out without picking up moisture. Just a bit of food for thought. Best regards, aevald
We experienced that when I found one of my welders running out of the procedure with his voltage and travel speed. He figured he could talk most of the day away and then play catch up by adding some voltage and travel along quite a bit faster.
What wire are you using ? When making a large pass in the flat or horiz fillet position an E70T-xx will be less likely to show this than E71T-xx . Because it is stopping at the surface it is due to the slag freezing before the gas gets out. Slag freezes faster on an E71T wire than it does on an E70T. Here are some ideas
1) If the pass is very thick it may take longer for the gas to escape. The slag freezes before the gas gets out. Try making a few smaller passes.
2) Rust or other contaminants may be generating gas. Make sure the joint is clean.
3) If you are using an all position wire in the flat position, try an E70. I have never seen the "worm tracks" on a vertical weld. I have seen it on flat and horizontal fillets.
4) Check the base material composition. Some elements may increase the possibility of porosity.
Have a nice day
Gerald
Iuka, Ms
pipewelder has listed some good advise, i would add that gun angle can influence it as well. also, amp/volt as mentioned previously
I've found that they are usually due to excessive traavel speed.
Thanks fellas I'll pay more attention to what you guys spoke about and try to take care of the problem. thanks alot for the help
p.s. the wire i use is .045 esab ultra 7100 or 7000
That's the same wire that I'm running. It's on a Miller Deltaweld 452 with a dual feeder. With 100% Co2 I like around 28v 250 ipm. Gas is set at 25cfh.
i've found i get worm tracks sometimes when my stickout is too short.
you know we had that problem and we tried everything even the old rolling the bottle someone told me you can run pure co2 to get that out but we didnt have a bottle of co2 so we kept messing with it and i found that having proper stick out and travel speed was a major contributer i found that 3/4 stick out at least made a worlds of diffrence
Hey how about this when running 100% c02 ,the regulator get frosty or a ice berg on it, does this poze a problem, cant remember what happens its been a while since i ran 100% co2.
thanks alot for the help fellas!!!!!
what kind of nozzle cleaner are u using, anti-spatter spray will make it worm track, nozzel dip w/nozzle hot seems to work fine, hope it helps.
Well so for so good , been rolling out 12" sch 40 and havent seen the worms yet I run the root with hard wire and 1 fill and a cover. If any one is wondering about the settings 22 volts,215 on the wire speed ,esab wire .045 ultra 7100 or 7000 cant remember. Thanks again fellas for the help!!!
Just my 2 cents
Try 1/8 to 1/4" of tip recess into the cup, it increases resistance provided the same stickout is used, it preheats the wire. If you've been running it flush you'll need to bump your volts up 1-2. If its old auction wire toss it and get new stock!
good luck
Whiteyford