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I was doing some stick welding yesterday, and was baffled that my beloved 6013 was giving me very erratic, uncontrollable arcs.Finally I realized that in using one of those red magnets to hold a piece vertical on another piece, the magnetic field was interacting with the electric arc, 'blowing it' in the wrong direction.Anyway not a question or anything, just a new observation for me.- John
Reply:I used to run into that quite often when a discharge lip of an aggregate screen would crack. Apparently the combination of constant vibration and rock pounding on it will form a magnetic field along the crack. I found heating the area along each side of the crack would get rid of the field. MikeOl' Stonebreaker "Experience is the name everyone gives to their mistakes"Hobart G-213 portableMiller 175 migMiller thunderbolt ac/dc stick Victor O/A setupMakita chop saw
Reply:My magnets aren't the best but never had that problem. Just switch to AC current to tack it and the back to DC to weld. Or leave it on AC if you prefer.
Reply:If you only have DC, switch polarith for a second, or wrap the ground cable in a coil around the work.Disclaimer; "I am just an a$$hole welder, don't take it personally ."
Reply:Thanks for all the thoughts. I just did a quick tack and then took the magnetic off, once I realized what was happening. Had me pretty befuddled for a few minutes though!- john
Reply:DC welding always produces a magnetic field no matter if you use a magnetic clamp or not. A magnetic field is generated any time you pass current through a wire. I am sure y'all know that but what the heck. If you take a length of wire and coil it around a screw driver and then touch one side of the wire to the neg side of your car battery and the other to the positive side you will succeed in magnetizing the screwdriver, same principle.the person who replied about wrapping a coil of the lead around the work hit the nail on the head. By doing this it neutralizes the effects of the magnetic field on the part.Nobody's perfect, I'm a nobody, therefore I am perfect!
Reply:On the screwdriver, if you drop a small part you just rap a screwdriver again a piece of steel and it'll pick that small item up for you. Doesn't last long though.On the welding...haven't seen much of it but at work once our wet mag operator got behind and was rushing. I picked up a fresh piece and saw arc wander like I'd never seen it before. Seems he neglected to de-mag a couple pieces while trying to catch up...lol. After that we made a coil, when he got behind someone could help him out.Anything worth doing is worth doing RIGHT
Reply:I have had the experience near the end of a bead with a short electrode and it blows up so I pull out and long arc away(off the end of the material) and then back in and I can usually get a good finish to the bead.
Reply:Tresi was right when he mentioned AC. 6013 is also an AC rod. The magnetism is cancelled or at least reduced by the constant build up and collapsing of the magnetic field.Arguing with a Welding Engineer is like wrestling with a pig... after a while you realize the pig likes it |
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发表于 2021-9-1 00:07:35