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  1. #11
    Join Date
    Jan 2012
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    28

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    There seems to be a lot of concern about your grinding but if I understand it correctly, you're lacking filler material. You either need to make another pass or two or use a weave on the top weld so that there is sufficient material to fill the void.

  2. #12
    Join Date
    May 2012
    Posts
    110

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    Quote Originally Posted by JMK WELDING View Post
    John why are you using 6010? Are you doing an open root then capping it with 7018? Why not just do a 30 degree bevel and butt them and just run 7018. Joe
    Hey Joe! Was looking for your input! I was only thinking a root of 6010 as that is what I've been taught as standard practice for structural joints - with 6010 to get 'better penetration' thus used as the root. But I wasn't sure it was necessary - or if it differs from a butt joint to a fillet weld joint. I think I might forget about the 6010 and just run a couple 7018's - it'll be easier for me!
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  3. #13
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,825

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    Bevel both sides & weld with 7018 will be fine. If you positively need 100% penetration then after welding the first side root, flip it over & grind out the second side till your into the first weld. Then weld it up alternating sides to minimize pulling.

    The real question you need to figure out is why did it break in the first place? If this isn't fixed then it will most likely fail again unless it was a one time incident that doesn't normally occur.
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  4. #14
    Join Date
    Feb 2012
    Location
    Wa
    Posts
    535

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    Flap disk for sure. Impossible to have the control with an abrasive grinding wheel. I like norton multi flaps.

  5. #15
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,825

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    Quote Originally Posted by Cgotto6 View Post
    Flap disk for sure. Impossible to have the control with an abrasive grinding wheel. I like norton multi flaps.
    I disagree with the grinding wheel comment. I've done hundreds of machine bases over the years where all outside seams had to be ground flush. 7" type 28 wheel followed by a 36 grit sanding disc. This is the fastest we found. It's in the technique. Most newbies tend to dig & leave a valley.

    http://www.mcmaster.com/#type-28-gri...wheels/=lenkx2



    http://www.mcmaster.com/#standard-sanding-discs/=lenlbj
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  6. #16
    Join Date
    Feb 2012
    Location
    Wa
    Posts
    535

    Default

    Quote Originally Posted by MMW View Post
    Quote Originally Posted by Cgotto6 View Post
    Flap disk for sure. Impossible to have the control with an abrasive grinding wheel. I like norton multi flaps.
    I disagree with the grinding wheel comment. I've done hundreds of machine bases over the years where all outside seams had to be ground flush. 7" type 28 wheel followed by a 36 grit sanding disc. This is the fastest we found. It's in the technique. Most newbies tend to dig & leave a valley.

    http://www.mcmaster.com/#type-28-gri...wheels/=lenkx2



    http://www.mcmaster.com/#standard-sanding-discs/=lenlbj
    Ill agree with you on that. Doing the rough decking with an abrasive to knock it down, but as we both said the best appearance/finish still needs to be done by sanding.

  7. #17
    Join Date
    Aug 2004
    Location
    Milan Michigan
    Posts
    1,684

    Default

    MMW, You are dead on, Not enouph filler metal.

    Thats one of the first things I have to teach a guy before I turn them loose with a grinder on a hand rail.

    You need to keep the grinding wheel on the weld and keep the grinder relatively flat.

    I can seem a pipe together and you will never find my weld, keep the ginder flat and on top of the weld.

    However all that is useless unless you have enouph filler metal.

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