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  1. #1
    Join Date
    Feb 2010
    Location
    Cambridge, MA
    Posts
    213

    Default Looking for some advice/pointers..

    Mainly from pipe weldors, and stick weldors.. I've been working on a weld cert pretty hardcore for the last month and i just can't seem to gain consistency on my 7018 caps. My instructor and i keep tweaking things, but nothing has stuck yet. Here is the basics on the cert procedure.

    1) Coupon is NPS 2" XXS 0.436"wall A106 (seamless) pipe
    2)Joint Configuration is a Single Vee Groove, with no backing or retainers. 35degree bevel +/- 5 degrees.
    3)6G fixed position coupon maintained with out rotating or moving stand
    4)Uphill progression on all vertical portions
    5)Root gap is 1/8" with a 1/8" landface
    6)Root pass done with E6010 1/8" with a max root penetration on flush to 1/8" and both walls broken down.
    7)Balance of test is E7018 3/32" rod
    8)"Stringer beads required for root pas, susequent passes may be weave or stringers"
    9)Initial and interpass cleaning with a power brush or grinder is allowed.
    10)Cap must be left in "As welded condition", can clean with power or hand brush tho
    11)O/D reinforcement is flush to 3/16" max.


    My root is generally pretty good, it will get a little heavy on me at the top. I usually fill with 2 weave passes of 7018 3/32" with the first weave at 80A and the second weave at 85A. Then i will run two hot stringers(90A) to get me to just below flush with the shoulders, and then i run a 3-stringer cap at 95A. I run the stringers with a drag and very little movement, especially at that heat. Not that it matters but i'm using a Miller XMT 304 CC/CV with a Miller RCH 14 remote.

    pics in next post
    Last edited by DamageInc537; 02-22-2010 at 04:04 PM.
    American By Birth, Union by Choice!

    4th generation Pipefitters LU 537

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  2. #2
    Join Date
    Feb 2010
    Location
    Cambridge, MA
    Posts
    213

    Default

    here are some pictures i took today of the coupons i ran.

    my bottom:
    side, right to left:
    side, left to right:
    top(were i need some major guidance):

    more in next post
    American By Birth, Union by Choice!

    4th generation Pipefitters LU 537

    SpeedGlass 9000x Hood
    Miller Elite Titanium 9400 Hood

  3. #3
    Join Date
    Feb 2010
    Location
    Cambridge, MA
    Posts
    213

    Default

    In the stand:
    Root1:
    Root 2:

    Any advice is appreciated, thanks in advance!!! I hope i provided enough information! if not lemme know i can add more

    Jeremy
    Last edited by DamageInc537; 02-22-2010 at 04:02 PM.
    American By Birth, Union by Choice!

    4th generation Pipefitters LU 537

    SpeedGlass 9000x Hood
    Miller Elite Titanium 9400 Hood

  4. #4
    Join Date
    Apr 2009
    Location
    Oswego IL
    Posts
    611

    Default Running to slow.....

    You are running to slow. I would try to cut your bead size down for the root, increase the speed. Also for the cap do it in one pass....ie more weeve....
    Kevin
    XMT 304
    Miller Spectrum 625
    Miller 30a spool gun
    S22a
    Miller Legend 302
    Lincoln LN25
    Ford f450 Maintainer Srv Truck

  5. #5
    Join Date
    Feb 2010
    Location
    Cambridge, MA
    Posts
    213

    Default

    Quote Originally Posted by Tryagn5 View Post
    You are running to slow. I would try to cut your bead size down for the root, increase the speed. Also for the cap do it in one pass....ie more weeve....
    Kevin
    a weave on the cap would be carrying a ton of metal.. its a pretty good size space shoulder to shoulder. what does it hurt to try tho right?

    American By Birth, Union by Choice!

    4th generation Pipefitters LU 537

    SpeedGlass 9000x Hood
    Miller Elite Titanium 9400 Hood

  6. #6
    Join Date
    Dec 2007
    Location
    alabama
    Posts
    746

    Default

    Quote Originally Posted by Tryagn5 View Post
    You are running to slow. I would try to cut your bead size down for the root, increase the speed. Also for the cap do it in one pass....ie more weeve....
    Kevin
    1 pass on a 6g position? That aint gonna happen.On the root try a 3/32 land and a 3/32 gap.

    95 amps is too hot for a cap.

    You need way more practice running stringers.It just dont happen overnight.
    2, XMT's 350 cc/cv
    1, XMT 350 vs
    1, TRAILBLAZER 302
    1, MILLER DVI
    1, PASSPORT PLUS
    1, DYNASTY 200 DX
    1, MAXSTAR 150 STL
    1, HOBART CHAMP
    1, HF-251 BOX
    1, S-74d
    1, S-75DXA
    2, 12-RC SUITCASES
    2, 30 A spoolguns

  7. #7
    Join Date
    Apr 2009
    Location
    Oswego IL
    Posts
    611

    Default Way I do it....

    Quote Originally Posted by fabricator View Post
    1 pass on a 6g position? That aint gonna happen.On the root try a 3/32 land and a 3/32 gap.

    95 amps is too hot for a cap.

    You need way more practice running stringers.It just dont happen overnight.
    On a pipe of that wall, looks to be 7/16 or 1/2 wall, absolutely do the cap in one pass. Root would be 3/32 run 80-85 amps, rest would be 1/8 rod at 100-110 amps. Cap pass would be 1/8 90-95 amps. The probelm he is having is learning how to stack the passes, plus he wanders while welding, causing himself difficulty. IE he building mounds with the weld. You can see in the root pass he is moving to slowly and having a lot of burn through. Also because he is using 3/32 I would bet he is running through the rod quickly causing him to have to start and stop a lot. However this is just my O2, as I do not weld pipe much anymore...but I did a ton of it in the past.
    Kevin
    XMT 304
    Miller Spectrum 625
    Miller 30a spool gun
    S22a
    Miller Legend 302
    Lincoln LN25
    Ford f450 Maintainer Srv Truck

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