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Old 04-02-2006, 11:07 AM
Don_S Don_S is offline
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Question 7018 throwing lots of globs

So working on the splitter project. Since I blew the power cable on the tig torch (should be in Tues, Yea). It's bee awhile since I've done much stick welding and have never used 7018. But at the suggestion of an ex-pipewelder at work I picked up a 5 lb box of 7018 and started in. I did pick up a 10 lb box of 7018 also.

Did a few passes on some plate cutoffs and it welded great. Welded the end gussets on one end of the beam (6011 root) and all went pretty good. Horizontals are a little saggy and I went downhill on the verticals

I went to work on the "sled" the peice that connects to one end of the cylinder and moves along the top of the beam. Started with 6011 root pass. Cleaned it up and started what I figured would be 3 passes of 7018. Material is A36 (as far as I know) steel 3/4" and 1" thick. All welds are fillet welds. Since I am doing it on the bench all welds are flat or horizontal. Running about 180 amps. It seems like I am getting a ton of spatter. When I go back to my practice plate the spatter is minimal but on these parts I have tons of it. Parts have had the edges cleaned up on a mill, solvent washed, and blasted (beads at work and aluminum oxide at home) to remove rust and mill scale. I can get the bead profile to look good but have a ton of berries all around the weld. Is this just the nature of 7018?

Maybe I need to drop my amps and add some preheat.

It seems that I have to force the rod into the weld pool. The rod burns up into the flux and I have to almost break the flux off as I am welding.

Don
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Old 04-02-2006, 11:20 AM
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Don, how about taking some pictures?
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Old 04-02-2006, 11:26 AM
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Had to edit as I missed the last part. What polarity are you running? should be DC+
Pictures would be nice...
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Old 04-02-2006, 11:52 AM
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Here and I thought you and Paul were in a fight
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Old 04-02-2006, 12:05 PM
Don_S Don_S is offline
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Default OK her are some pics

Jeff

Running DCRP. Anywhere from 175-200 amps. This is just a guess 45-60 on the amp adjust 75 amp min range. Linde heliarc 250hf ~320? amps wide open. Rod is KT industries 7018 not 7018AC but the package says you can run it on AC or DC+. They had other rod that was marked 7018AC.

Cutter

Here are some pics. The practice doesn't have too many berries around it. The other two are of the last fillet I ran and haven't gone to town too much with the cleanup. Just beat the heck out of it with the chipping hammer and blew it off. You will notice some aggressive marks on the weld.

Any other commments / critisisms / insights welcome.

Don
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Old 04-02-2006, 12:16 PM
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Shade Tree Welder Shade Tree Welder is offline
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Quote:
Originally Posted by Don_S
Running DCRP. Anywhere from 175-200 amps.
Ummm there's your problem, unless you are running 5/32" rod?

3/16" 200-275
5/32" 150-220
1/8" 110-165
3/32" 65-100
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Old 04-02-2006, 12:21 PM
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I'll add you are probably running too short an arc, try opening up the gap a little 7018, IMO, like a gap just under the diameter of the rod. if you are forcing the rod into the puddle that would explain the excessive spatter.
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Old 04-02-2006, 12:35 PM
Don_S Don_S is offline
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Actually, I was running 5/32 for what you see there. The wierd thing is that I can weld what you see there and pop an new rod in and go over to the pratice plate and weld with little spatter.

I tried turning it down before and ended up with a tall bead. Probably turned it down too far. I guess I just need to play with it more.

I am going to go out and cut some practice pieces and put them together in a fillet configuration. We'll see what happens. It won't have the blind corner in it so clean up will be much easier.

Thanks,

Don
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Old 04-02-2006, 12:35 PM
Don_S Don_S is offline
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Shade,

I'll try opening it up some and see what happens.

Thanks,

Don
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Old 04-02-2006, 03:02 PM
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Maybe an arc blow prob? Try changing the work clamp location-
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