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I'm sort of new at running dual shield. Sometimes I get porosity on the top of my beads, its like little holes or craters. These holes mostly are always in the shape of a carrott ( long slender, narrow at one end and widen towards the other end). Even when the sound of the weld is smooth and everything seems to be dialed in, I chip the slag off and there the holes are. At first I thought I corrected the problem by turning up the wire speed a little, but if I'm doing a gapped seem weld or anything thats open rooted, sometimes this problem occurs. Many times the top of the weld appears like a bunch of holes that are curved cone shapes much like the shape of little jalopeno chilis. When I grind the weld out, seems the holes were on top of the bead and not really deep down or in center of weld. Anyone have any ideas whats causing this?
Reply:Either too much voltage, or not enough shielding gas. These wires are voltage-sensitive, either look up online or get the literature from your LWS, for the specific wire you are using. Set your machine to WS, volts, and amps according to the parameters listed. Watch the stick-out, also. As you increase stick-out, voltage goes up.Shielding gas -- while 20 CFM is great for hard-wire, most dual shields require anything from 30 - 50 CFM. Look it up.
Reply:Worm tracks..hate those things. Voltage and gas are the usual suspects...although, recently, I have found a new one. I was using Esab's new 710-X wire and it was tracking something fierce. Esab confirmed voltage and gas were perfect. Turns out moisture in the wire was the trouble. Apparently, this wire is extremely sensitive to moisture. Cook it out and it will run perfectly.QamuIs Heg qaq law' lorvIs yInqaq puS
Reply:Like was said above its worm tracking. VOLTAGE is number 1 suspect, To high a voltage can leave some mean worm tracking and drive you nuts. Use the manufacturers recommended specs for the wire and only adjust slightly from their ideals.Second is gas coverage, 45CFM is close to what most of these dual shield wires like for shielding.Third is a bad roll of wire. If the wire gets moisture contaminated its junk. its much like A low hy stick rod. I don't know of any procedures to dry them back out like a stick rod, that doesn't mean there isn't a procedure though.Vantage 500's LN-25's, VI-400's, cobramatics, Miller migs, synch 350 LX, Powcon inverters, XMT's, 250 Ton Acurrpress 12' brake, 1/4" 10' Atlantic shear,Koikie plasma table W/ esab plasmas. marvel & hyd-mech saws, pirrana & metal muncher punches.
Reply:FWIW, this came directly from Esab Tech.......350° for 6-8 hours for a 30# roll of 700 X series wire. It does work. Tracking disappears completely. Of course, the wire would have to be on a metal spool. The plastic ones won't take over 120° according to Esab.I'll do this for non code type things. If it was important, I'd buy another roll of wire.QamuIs Heg qaq law' lorvIs yInqaq puS
Reply:pssst, 45 CFM gas flow is H-U-G-E.45 CFH is more like it. Yeah, don't bake a plastic spool. The best laid schemes ... Gang oft agley ...
Reply:CFM / CFH ... a common mistake in terminology, but the gauge is calibrated in CFH .
Reply:Recently my school went over to a manifold shield gas system and while I was running flux core I was getting worm track, turns out that there was moisture in the lines that hadn't been purged out.
Reply:sorry my fingers were typing faster than my brain could keep up of vice versa. Indeed its CFHVantage 500's LN-25's, VI-400's, cobramatics, Miller migs, synch 350 LX, Powcon inverters, XMT's, 250 Ton Acurrpress 12' brake, 1/4" 10' Atlantic shear,Koikie plasma table W/ esab plasmas. marvel & hyd-mech saws, pirrana & metal muncher punches.
Reply:what material are you weldingBOILERMAKER |
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发表于 2021-9-1 00:41:01