Penetration & fusion - Part 2

  1. MichaelV

    MichaelV Forum Supporter

    Messages:
    221
    Location:
    Co. Antrim
    Following on from Part 1 and comments by @Brad93 and @TechnicAl I repeated Part 1's exercise, with with a root run using 2.5 mm electrodes.

    Position & material:
    PB (2F), tee joint between 10 mm thick mild steel, rolled flat bars (hence rolled edges; see below).

    Parameters:
    Root pass each side with 2.5 mm, 6013 (INE 46), DC negative, 95A, zero arc force.
    Remaining passes each side with 3.2 mm, 6013 (INE 46), DC negative, 125A, zero arc force. Passes were made on alternating basis, rather than building up complete weld on one side of the joint.

    Remarks:
    Very similar to the test in Part 1, and the root situation did not benefit from the smaller 2.5 mm electrode. Welder skill a likely factor. It would be interesting to see if and how some "dig" improves this aspect. One for a later test.

    Michael

    01.JPEG
     
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  2. Munkul

    Munkul Jack of some trades, Master of none

    Messages:
    3,144
    Location:
    Cumbria
    Always like to see a cut and etch :)

    You should have been running dcep for that thickness, and less amps.. Unless your welder lies about the amps and overreads. Probably around 80 to 90 amps max would do it. As it stands, none of that has anywhere near enough penetration.
     
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  3. MichaelV

    MichaelV Forum Supporter

    Messages:
    221
    Location:
    Co. Antrim
    Thanks @Munkul

    You're quite right, and this is exactly what the exercise is aimed at... throwing light on how penetration and fusion can never be taken for granted.

    I will be running 6013 tests on DCEP, but must admit I would never go lower than 110-120A for 3.2 mm with material of this thickness.

    I'm reasonably confident on the displayed parameters as it's a TransPocket 180, albeit out of calibration period ;)

    Michael

     
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  4. Munkul

    Munkul Jack of some trades, Master of none

    Messages:
    3,144
    Location:
    Cumbria
    Cool, sorry if I sounded a bit condescending :) So how about repeat the exercise in DCEP? It would be really interesting to see.

    Sorry I missed the bit about subsequent passes with 3.2, I thought you'd done it all in 2.5.
     
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