More MIG verticle up

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Once again, I appologise for picture quality. Settings were,Volts 19Wire: 5 meters/minamps, about 135.Steady as she goes!. Wouldn't pass on a pressure vessel... In Australia.  I'm not even a tradesman.Last edited by mat; 11-14-2007 at 04:14 AM.
Reply:I always weld mig down. I am pretty sure that is one of the reasons it was designed for. Dave
Reply:Why do you think it won't pass.  John G.SMAW,GMAW,FCAW,GTAW,SAW,PAC/PAW/OFCand Shielding Gases.  There all here. :
Reply:That looks goodHTP Invertig 201Lincoln Idealarc SP250Miller 180 AC StickBy farmall:They should have held the seagull closer to the work, squeezing evenly for best deposition.
Reply:Originally Posted by weldgaultWhy do you think it won't pass.  John G.
Reply:Mat, looks good - 2 passes or 3???Turbo38T, I respectfully disagree with your statement.  Wire feed welding, either GMAW, FCAW-SS or FCAW-DS were designed for production welding with higher deposition rates, not vertical downhand welds.....Wire feed welds done vertical down are pretty much for aesthetics only as there is almost no fusion, metal deposition, or weld re-inforcement.  If you view V-down welds from above or below - especially the hot ones - they are are extremely concave.I have used Globular & Spray Arc V-down for welding on light boxes etc to truck decks & trailers, but never for anything requiring strength.  Just a trick to increase the "Cool Factor" and impress the customers.If the weld has a specific function ie structural integrity, I always go V-up.As always....Opinions Vary....This works for me.
Reply:Single run black wolf, single run.
Reply:Really??? I suspected to get the bead that wide, you would have ran an initial narrow "root pass" then ran a "cap" pass over it to produce the weld shown in the picture.The picture is decieving.....What are the thicknesses of the parent metals and how wide is the bead???If that was done with 2 passes, you would eliminate the slight "sag" in the middle of the bead.  The stacked passes could be almost completely flat, and with not having to fill as much, could be made a little tighter.Don't mind me, I'm a perfectionist.  Your weld bead is really very nice.Last edited by Black Wolf; 11-18-2007 at 02:38 AM.Later,Jason
Reply:Looks like it is cold, have you tried any destructive tests? doesn't look like it has good fusion.
Reply:I think the thickness was 6mm, bead toe to toe was 15mm, Done with a Xmas tree method.
Reply:I call it the triangle weave, same thing.  Using that method, you get great penetration in the root.  Also when the heat is put into the root like that, it sucks the middle in because the metal will follow the heat.  I posted a movie of the same weave with stick.  I can't seem to film it with MIG.  Those are the same settings I use, 19 volts, 150 ipm with .045.6mm = .240"  give or take a few.Nice work.UP is the only way to go for strength.  DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:I use a Miller matic 350P and I just finished an 80% hull replacement on a 100' tour ship. I was experiminting one day with my mig on pulse with .045 flux core wire and found it does the best verticle down I have ever done. I even do it with gas an solid wire now. The pulse is so much diferent than trditional MIG it has taken me a while to get it right but I love it. It also does aluminum in all positions like a champ. I can do overhead on 1/16" wall 1/1 or 1/2 and it looks perfect. By the way all V/D pulse MIG weld pased a die test and visual inspection with flying colors. Steel Thunder Welding LLC. St. Thomas VI USAMM350PBOBCAT 3MAXSTAR 150 STH375 EXTREME PLASMA6.5 HP COMPRESORDEWALT 18, 24, AND 36 VOLTO/A TORCH SETAND SO MUCH MORE I DONT REMEMBERALL IN MY 2005 2500HD EXTENDED CAB L/B
Reply:Please show us some break test photos? I am waiting to see the big line up the centre.
Reply:Originally Posted by matAustralian pressure vessel welding standards are some of the highest in the world. It may pass in america or some other countrys but not here.Turbo, you can't weld over 4mm plate down hill, you won't get good fusion.
Reply:"If you view V-down welds from above or below - especially the hot ones - they are are extremely concave." Negative, improper technique my friend. If you have proper machine setup , proper wire speed and can really work the puddle you can get a suficient, strong, convex bead mig short arc down hand. Practice....Dave
Reply:So why did the bead in the picture not pass, and how was it determined to be a failure? Was it by visual inspection or physical testing of some kind? City of L.A. Structural; Manual & Semi-Automatic;"Surely there is a mine for silver, and a place where gold is refined. Iron is taken from the earth, and copper is smelted from ore."Job 28:1,2Lincoln, Miller, Victor & ISV BibleDanny
Reply:Originally Posted by turbo38t"If you view V-down welds from above or below - especially the hot ones - they are are extremely concave." Negative, improper technique my friend. If you have proper machine setup , proper wire speed and can really work the puddle you can get a suficient, strong, convex bead mig short arc down hand. Practice....Dave
Reply:Originally Posted by Black WolfThank you very much for the response..... I never said MY V-downs were concave.  I HAVE been trained how to do them, and I am very capable of setting up a wire feeder for this or any other weld.  And no..... I don't require "practice"..... I just don't believe in them.  For me:V-Down for show (or as a root pass to cover a gap w/ V-up as fill & cap)V-Up for strength.No disrespect intended - we just have different takes on this.