7018 root pictures...

admin

Anyone have any 7018 root pictures they would like to share ?   The reason I ask is because you do not see many 7018 root pictures online.  Some people stringer them in on straight or reverse polarity others weave.....  Add a picture and describe how you do it..May be a nice thread for teaching people the various ways of rooting with an "18" seriesPersonally I weave like described in Hoobasar Rampauls book..." Pipe Welding Procedures"  (More of a manipulation than a weave)Here is a picture of my first attempt in quite a while,  im having to get back into rooting with 7018 to get on a large construction project here...Oh an I ran a 3/32 land 1/8 gap with a 3/32, 7018 at around 83 amps on a Ranger 305GAnd yes I know the root needs a bit of work its my first one in well over a year... Attached ImagesLast edited by Newfie_1986; 08-09-2013 at 09:40 PM.Journeyman / Red Seal Welder (What a useless test)Miller CST 280Miller XMT 350Miller 12vs XtremeEvolution Evo 28 mag drillEvolution 380 Dry Cut saw
Reply:Originally Posted by Newfie_1986Anyone have any 7018 root pictures they would like to share ?   The reason I ask is because you do not see many 7018 root pictures online.
Reply:During my studies, and watching stuff on root pass, I have never seen a 3/32" rod used either particularly with a 1/8" gap.
Reply:3/32 rod is used with a 1/8 gap so you don't end up long arcing.  A 7018 has a lot more flux than a 6010... As for porosity I don't know too many around here having issues with 7018 roots and porosity.   Im not saying you don't get it, just that people make a big deal out of it when its not.  Do it right and get no porosity...   Ex run a 1/8 7018 on a root with 1/8 gap the flux will hold the rod out and you will be long arcing thus porosity and most likely suck back....   I will take a picture tomorrow of my book and show the section on 7018 roots...7018 roots are used on ASME and structural welding here...  Depending on the procedure ASME piping is typically ran with 6011 or 7018 roots....  Open roots with no backing....   Im practicing up my 7018 roots for structural welding with the Iron Workers on an oil rig being fabricated here....Last edited by Newfie_1986; 08-09-2013 at 10:44 PM.Journeyman / Red Seal Welder (What a useless test)Miller CST 280Miller XMT 350Miller 12vs XtremeEvolution Evo 28 mag drillEvolution 380 Dry Cut saw
Reply:Used a 3/32 309 wire in a 5/32 gap, tigging on 2" pipe the other day. Talk about a test in patience. Doesn't look too bad though. I'd never try it unless it was in the wps.So they really use 7018 that often? I've only had one job so far but we weld to ASME IX with 6010s. I'm a pipe welder, I assume that's the difference?
Reply:Weird ive never seen/used 7018s for roots. ever. Maybe a different section of the asme. but in piping asme section 9 we use 6010 for root .
Reply:Here in Newfoundland, Canada it is used a fair bit.  The Hebron GBS will be welded with 7018 roots and the Hibernia GBS was welded with 7018 roots....   I have to pass a T- Class CWB test to get on the project (Hebron) which is an 18 root, fill and cap in the 6 G on 6 Inch....   I know guys who have tested out to section 9 of the ASME code with 7018 roots because it was the shops procedure..  6010 is hardly ever used here,  if it isn't rooted with 6011 its 7018 typically...Last edited by Newfie_1986; 08-09-2013 at 10:52 PM.Journeyman / Red Seal Welder (What a useless test)Miller CST 280Miller XMT 350Miller 12vs XtremeEvolution Evo 28 mag drillEvolution 380 Dry Cut saw
Reply:It's not so farfetched, when I think of it. I remember blowing a hole in my 6010 root and filling it back in with a 7018. Worked just fine. This was a practice piece... before anyone says anything lol. I'd love to get on that job, though. Is Hibernia bigger than Thunderhorse?
Reply:That's interesting and good to know. Maybe if I work further up north ill have to give this a try,
Reply:Here is a picture of Hibernia shes been at sea since 1997 still to date the largest oil rig to be put to sea....  As far as I know...Hebron is the new one being built.  Will be further off our shores, but only 2/3rds the size of Hibernia.  You cannot see it in the picture but the rig has an ice wall.  Basically the gravity base structure is shaped like a huge gear, made from reinforced concrete and engineered to take a direct ice berg hit,  Hebron will not have that feature either...   Hibernia cost 8 BILLION dollars to construct in the 90's... Attached ImagesLast edited by Newfie_1986; 08-09-2013 at 11:16 PM.Journeyman / Red Seal Welder (What a useless test)Miller CST 280Miller XMT 350Miller 12vs XtremeEvolution Evo 28 mag drillEvolution 380 Dry Cut saw
Reply:Surprised more people don't have experience with the lo-hi root. Basically same technique as a stainless stick root.  Long time since I did either, but remember pivoting the wrist to target alternating land faces.  Helps to assure catching both edges inside.  Looking good Newfie.
Reply:That is exactly how I do it OldSparks crank my wrist to point the electrode at each land...  Works nice...As promised here are pictures from the book I spoke about above...You can see the weave pattern AND the reasoning for the smaller electrode.... Attached ImagesJourneyman / Red Seal Welder (What a useless test)Miller CST 280Miller XMT 350Miller 12vs XtremeEvolution Evo 28 mag drillEvolution 380 Dry Cut saw
Reply:Phillips Pet had us use a 7016 rod on the root, it was a 2.6mm(0.102in) It was called LB-52U made by kobe steel,ltd in Japan. I had my helper on the remote through out the whole weld---Start hot, cool off cool off more about 4 to 2 oclock, then heat back up to the top. The beads were about flat, sometimes you had to have the x-ray tech call the Phillips weld inspector to explain that is the way they were supposed to be. Took a lot more time, I don't know if they still do this.
Reply:We test with Kobe rod also. We have to weld a 12/12 butt and a 12/12 branch. All  lohi. It isn't that hard of a test with the Kobe rod. If your using 7018 it's a lot harder. I leave lots of space with a 3/32 land Run it cold and walk it up. It looks almost like a tig root. You do not want it jammed and keep a really tight arc.
Reply:Wow still no takers on the pictures.  I would have thought more people had laid 7018 roots in.  Oh well as I practice I will have to put up some more pictures.   I will try and clean up the pipe a little more inside,  should make the toes wet in better rather than have that rust there....  Im getting high/low on my pipe too,  can't seem to get it to line up nice like id like at all,  pipe seems to be pretty out of round.  I do have some other pipe im going to fit up... See how it goes.. OldSparks any suggestions on 309 smaw roots ?   I have heard its similar to 7018 as you had stated...I do have some 309L in 3/32, maybe I will have a go at it and post a pic or two, hopefully I wont embarrass myself hahaha...Bunch of guys where I used to work went in and tested on 309 smaw roots they all failed on visual...  It would be something id like to learn..Last edited by Newfie_1986; 08-11-2013 at 02:22 PM.Journeyman / Red Seal Welder (What a useless test)Miller CST 280Miller XMT 350Miller 12vs XtremeEvolution Evo 28 mag drillEvolution 380 Dry Cut saw
Reply:Ive taken some pipeline tests with 7018 roots on inservice branch tests.. I never took any photos  though, I was a bit pre-occupied.Local 597
Reply:I done my open root test with 7018..1/8th gap and about 3/32 land...with a 3/32 7018...passed X-ray no problem..as Newfie said keep your gap wider than rod so you don't long arc and it works fine for rooting..
Reply:As you can see in the first pic the root is a bit sucked back and I have some internal undercut (camera makes it look worse than it is).  To try and eliminate this I plan to clean the inside of the pipe better....  Im going to use a burr bit on a die grinder instead of a flap wheel...   Also to help with the suck back I am going to try a 3/32 gap.  a 3/32 gap should give me a more narrow root bead inside.  The less metal I have to put in to fill the gap the less likely it should be for it to suck back....I believe in the second pic the gap had shrunk a bit during tacking which is why the bead is a little more "in there"..All pics are of the bottom on a 6G...More pics tomorrow maybe,  these are from days ago... Attached ImagesLast edited by Newfie_1986; 08-16-2013 at 09:44 PM.Journeyman / Red Seal Welder (What a useless test)Miller CST 280Miller XMT 350Miller 12vs XtremeEvolution Evo 28 mag drillEvolution 380 Dry Cut saw