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Tool Talk Discussion Forum

7018 Welding Rods

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Dale in WV

07-21-2004 18:09:54




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Brother-in-Law just got a 50lb box of "MG" 7018 rods 1/8". Problem is, we only have an AC 220V 225A buzzbox. Any way to take advantage of those rods with the that equipment, or does he have 50 lbs of fodder??




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Andy

07-24-2004 07:37:03




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 Re: 7018 Welding Rods in reply to Dale in WV, 07-21-2004 18:09:54  
If you have an AC welder you need to use 7018 AC rods. In a pinch I have used DC rods and ran them hot in an AC welder.



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T_Bone

07-23-2004 15:22:20




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 Re: 7018 Welding Rods in reply to Dale in WV, 07-21-2004 18:09:54  
Hi Dale,

Here's a list I made and few years back.

It's the electrode flux that first determines the best choice of welding current type. Since flux composistion is classified "top seceret" by the manufactures we can only generalize without looking up the mfg electrode recomendations.

If your using a unkown electrode mfg then you can use this "generalized" list:

Last number on the rod is flux type:
8= DCEP
O= DCEP
1= DCEN
2,3,4 or 7= AC or DC
5= DCEP (only)
6= DCRP, AC, DCEN

DCEP= DC electrode positive also called reverse polarity

DCEN= DC electrode negitive also called straight polarity

This list doesn't hold true for all electrodes. If the above list recomends DCEP and the electrode doesn't run well, try DCEN, then AC.

You can also use the 7018 as trading stock to someone that has a box of rods you want.

T_Bone

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txblu

07-23-2004 05:56:41




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 Re: 7018 Welding Rods in reply to Dale in WV, 07-21-2004 18:09:54  
My rod of choice after trying the popular 6000 series. But for AC I do use 7018AC, not straight as they do as mentioned by Lou I think.

Maybe you could trade them for some AC's.

Mark



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Lou

07-22-2004 08:02:17




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 Re: 7018 Welding Rods in reply to Dale in WV, 07-21-2004 18:09:54  
7018AC will run fine with an AC welder, Looks good and welds good, however the material has to be very clean no rust or oil, and if doing a second pass has to be cleaned up realy well. I have had decent luck with plain 7018 by turning the heat up higher than normal. If a rod is not completly used and you try to restrick it with an AC welder it will be very difficult to restrick, scrap the flux of the end of the rod on a clean file and it will be good to go again. 7018 is not a penetrating or gouging rod.

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KX

07-22-2004 07:34:59




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 Re: 7018 Welding Rods in reply to Dale in WV, 07-21-2004 18:09:54  
My newer Lincoln AC welder will run a pretty nice bead with 7018, the older all copper AC machine will not run anything even remotely similar to a nice bead with 7018. I always figured that the newer one was wound different but I never gave it a lot of time to research. I do like the older one better for 6011, 6013, 6010. Before you declare 50 lbs of 7018 fodder, turn the heat up and try it. I have seen 7018 AC rod but never tried it. Good luck.

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TimV

07-22-2004 06:04:25




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 Re: 7018 Welding Rods in reply to Dale in WV, 07-21-2004 18:09:54  
Dale: I run quite a bit of 1/8" 7018 on my Lincoln AC225. However, not all 7018 is created equal--the rods I use are made for either AC or DC. I've seen some 7018 that specified "DC-only" right on the box, and I can't run those on my AC rig--I tried a couple, but they sputtered, fizzed, and wouldn't hold an arc. Luckily they were some that came by accident from a friend's workshop--they crawled inside his lunchbox and he didn't find them until he got home....:-) I'd try to run a rod and see how it works--if they hold an arc, go for it--if not, you've got an excellent paperweight.

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Mike M

07-22-2004 05:30:24




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 Re: 7018 Welding Rods in reply to Dale in WV, 07-21-2004 18:09:54  
I never had good luck running those AC. Also I think if 7018 isn't stored right it becomes bad.



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SHeiserman

07-21-2004 18:59:26




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 Re: 7018 Welding Rods in reply to Dale in WV, 07-21-2004 18:09:54  
Don't do much AC welding myself, but MG 7018 is made to run AC or DCEP. Keep it at 100-150 amps, and it should work.



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