Worm holes...

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Ouch not sure what happened here. 1/8 7018 3/8" fillet at~ 125ampsdcen
Reply:Wrong polarity if you had electrode negative.Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power) Hobart MIG
Reply:Oops sorry bout that. Dcep. Good catch though.
Reply:Hello drillerjoe, could possibly be left-over cutting fluid? or other contaminants from a cutting operation, or sometimes the identifying paint that is used on the ends of tube steel can cause some off-gassing that can leave porosity in weld deposits when it is welded over/in the proximity of. Or simply wet rod. Good luck and best regards, Allanaevald
Reply:Hmmm.Three completely different looking welds.Same rod, same amperage, same machine???Was that a single pass, or is there a small bead with an attempt to run one over it?Sometimes when you have a little bit of porosity in a first pass, it comes back like porosity on steroids when you try to cover it up.I have welded over paint without that result, but have seen oil cause real problems....but the steel appears to been clean, looking at the unaffected areas.Good puzzle.
Reply:Yes sirs. I have been cranking them out all morning. The pics ate not finished product. Just first two of three passes. This was the only one that generated the worm holes.
Reply:Oh and yes geezerbill. Sane rod setting and machine. The last one is a really bad picture. Lol. Done 14 more so far and non have produced the porosity like that one. Plus everything looked good under hood and the slat was even and complete until I cleaned it up. Must have been some oil or other contaminant.
Reply:could be caused by moisture/condensation on the workpiece turning to steam as you weld.i.u.o.e. # 15queens, ny and sunny fla
Reply:Throw the 7018 rods in the oven for a couple hours, Low hydrogen rods need to be dry.
Reply:You probably left paint on the end of the beam, and it heated up and outgassed in your weld...Welding/Fab Pics: www.UtahWeld.com
Reply:Originally Posted by kctgbThrow the 7018 rods in the oven for a couple hours, Low hydrogen rods need to be dry.
Reply:I am using shop rods that where bought recently from praxair. No oven available yet. I can tell you this as well. You can be burning one of these rods and watch the flux fall off half way up the rod. You'll loose about 2-3" of usable rod.  Also when burning these you will have spatter that looks like small Hersheys kisses laying fat side down. I'll try to get a picture.
Reply:If you have that much trouble with the flux falling off the rods are probably to blame. I use Lincoln excalibur, never had any trouble like that with them. Even old rods (15-20yo) that have been in the shop burn fine..most of them anyway.Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power) Hobart MIG
Reply:I don't think I've ever had it that bad in a single pass, but Mckay rods always leave porosity when I use them. So we normally use lincoln or esab.
Reply:I'm a Lincoln burner myself on the norm. Already been many time where frustration has me dipping into my rod guards!