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pipe welding

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  • pipe welding

    Hello iam a certified welding but not pipe, i have done some pipe welding but all of it with 6011, i would like to take the test but need to no the technics on how to run the welds on the 6 G postion, like is it up all down welding for the root with 6011 and 7018 for the rest of it, How big is the pipe and how thick thank you for any help some one can give me.i want to be qualified for welding boilers some pipe welding i have read about say down beads and some say up welds some say 5inch scd 80 and some say 8inch scd 80
    Last edited by limey; 03-12-2007, 04:05 PM.

  • #2
    The diameters and thickness vary and there are different tests for different ranges. Similarly, there are different processes and progressions that are accepted in different industries.

    No simple answer.
    Bill C
    "The more I learn about welding the more I find there is to learn..."


    • #3
      Download this and read it

      Get some coupons, prep them as per guide, and have at it with a E6010 like Fleetweld 5P+ . Don't try to mess around with GMAW root, low hydrogen root, low hydrogen vertical down etc until you get good with a cellulosic electrode

      Although there are exceptions to this , typically API vertical Down, ASME ( in plant ) vertical up


      • #4
        Yup, second that. Even in general welding good basic stick skills are unmistakable.
        Last edited by Sberry; 03-12-2007, 07:01 PM.


        • #5
          Depends what company is giving the test. Where i work for a 6" 6G pipe its all 1/8" 7018 no downhills, 1/8 gap, X Rayed and a 3 hour written test before the hands on welding test...Bob
          Bob Wright, Grandson of Tee Nee Boat Trailer Founder
          Metal Master Fab
          Salem, Ohio
          Birthplace of the Silver & Deming Drill


          • #6
            I'll third TRG-42 and Berry.

            Probably most common test is going to be either 6010 root with 7018 fill, up progression, or 6010 downhand all the way out. Lots of other options, but these cover most pressure applications and most pipeine applications (maybe 75% of them or more) A third would likely be TIG root, 7018 cover, up, for some pressure applications. Don't worry about TIG root until you can do cellucitic root.

            Typical coupons these days in the pressure world are 2.75"OD, 5/8 wall "monster coupons" (brand name for pre-prepped test coupons), which cover unlimited thickness (under ASME code) and down to 1"OD (again, under ASME code...)

            Codes vary from job to job and jurisdiction to jurisdiction, so check before betting too hard.

            For do it yourself practice, 2" SCH 80 pipe is a good place to go. Slighly smaller at the root diameter than the aforementioned monster coupons, but not much. Any smaller than this is real tough to learn on.
            I may not be good looking, but I make up for it with my dazzling lack of personality