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Can someone Explain Multi-passing?

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  • paulrbrown
    replied
    /That should read[220lbs,12"x30"x7"] still alot of welding, Paul

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  • paulrbrown
    replied
    For out of Position welds, welders max capacity can be to great to control. those big bad rods don't like to go uphill and overhead....I find 1/8" to work well and for me are easier to control. Before I welded alot, I saw a piece of ships anchor chain that had been welded together, each link 220lbs,12"x30"x7', they said it took 24 hours nonstop welding, I did not believe them at the time, but after study and actual practice, I understood. The chain was 750' long, not easy to move about, they used 2 D11 Cat Doziers.

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  • hankj
    replied
    d-dawg,

    Multi-pass technique is required when the thickness of your weldment is greater than your welder's single pass rating. The sequence of beads is important, as well as allowing the weldment to cool between passes, usually to at least 500°.
    Beads should be run in sequence - the root pass will be the first bead. Successive beads should be run from one side of the joint to the othet IN SEQUENCE - bead 3 next to bead 2, then bead 4 on top of bead 2, bead 5 next to 4, etc., for as many repetitions as necessary.

    Hope that made sense. It would be best if you went to the book store and picked up a copy of "Welding Essentials". It has a lot of good info for a beginer.

    Hank

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  • Leons2003
    replied
    Originally posted by paulrbrown
    21 is abut the proper number needed for 1" fillet or groove.......Patience is needed!!!!! Paul
    Yeah, and think about NUKE piping, eh Paul
    L*S

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  • GaryM
    replied
    Originally posted by paulrbrown
    21 is abut the proper number needed for 1" fillet or groove.......Patience is needed!

    Wow paul that seems like a lot what rod you doing that with 3/32"???


    Gary

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  • paulrbrown
    replied
    21 is abut the proper number needed for 1" fillet or groove.......Patience is needed!!!!! Paul

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  • Blown S-10
    replied
    Originally posted by wrench3047
    I drew a quick thing It has the metal in black, weld pattern in red. It's just a real quick drawing I apoligize because it's rough.
    that sure is a LOT of pass's

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  • Guest's Avatar
    Guest replied
    Nothing wrong with that SGT.

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  • Guest's Avatar
    Guest replied
    (Each circle of red represents a pass) for those who didn't know.

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  • wrench3047
    replied
    I drew a quick thing It has the metal in black, weld pattern in red. It's just a real quick drawing I apoligize because it's rough.
    Attached Files

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  • Blown S-10
    replied
    thats when you have/need to make more than one bead down a joint to achieve the proper fill of the joint.

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  • d-dawgg
    started a topic Can someone Explain Multi-passing?

    Can someone Explain Multi-passing?

    can some one please explain multi-passing? maby how it is done! thanx
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