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Tool Talk Discussion Board

Re: Welding 7018 with a buzz box

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Posted by Stan in Oly, WA on December 19, 2012 at 11:30:56 from (

In Reply to: Welding 7018 with a buzz box posted by rusted nuts on December 18, 2012 at 15:15:09:

Didn't Lanse recently make a video comparing 7018 and 6011 welds done both AC and DC? If I remember correctly (never a given, nowadays), the 7018 welds on AC turned out to be slightly stronger than those done with DC.

7018 is not a purely DC rod like 6010. Lincoln lists DC+ as the preferred polarity for their E7018 H4R (Jetweld LH-70), but also lists the setting range for AC for all sizes up to 3/16" rods. Above 3/16", AC is listed as the preferred polarity.

I've never found a 7018AC that I like. I haven't been forced to use it much, but the few times I've tried it, it's shown a tendency toward erratic behavior, and occasional porosity. I'm not saying it's bad---just that it has never worked well for me. If I only had an AC welder to use, I might still use regular 7018 (run it a little hotter and try real hard), or take the time to shop around until I found a 7018AC that I liked. But I've already tried at least five brands---Lincoln, Weld-It (Hobart's second best), Forney, and two or three mystery rods which weren't any of those---and haven't been impressed with any of them.



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