Had my Loader Maged-photos
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Had my Loader Maged-photos

  1. #1
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    Default Had my Loader Maged-photos

    I'm not a mag guy, or a welder, but these are the only 2 spot where anything showed up. The guy that pointed this out said these were "leaks", but didn't know how deep.

    Standard light:


    In the booth



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    Senior Member TrollerDave's Avatar
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    What does the blue in the 2nd and 3rd pics mean? Cracks, weak spots?

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    The blue areas are probably just filtered colors showing through in the photos. The thing to look for in the mag-flux are the green high-lighted lines around the welds. As in the first photo, it's around the overlap of the weld bead. And in the second, it's the rounded areas next to the mounting holes.

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    B1 Racing cs19's Avatar
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    Your gonna see what looks like cracks in any area where a weld begins if there is any kind of shelf, especially if the welds are globbed on, read about how magging works and you'll know what to ignore and what to look for. There are critical areas you should be looking at closely, like at the rear edge of the mounting pad on the uprights. I wouldn't be too concerned about what you've posted so far.

    How thick are the uprights? Those need to be 3/16 minimum if they are thinner toss it.

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    Senior Member sandeggo's Avatar
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    1. Why are these mig welded?
    2. A little more voltage on that weld would've helped wet it out.

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    Senior Member Lildave's Avatar
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    My former job was in NDT and I used to do Mag Testing every day... Those look just fine. If you watched him do the test, he should have applied the spray twice using the electro magnet in two different angles like an X pattern. What happens is... There is a fine metal powder that rushes back and fourth from prod to prod, and will get caught up in, or gather up at a crack (short and simple explanation) and the crack (indication as we had to call it) has to be perpendicular to the prods so that the powder goes accross it (the reason for 2 applications in an X pattern) or it won't show up very well sometimes. That same powder will gather up at any rough edge (paint to bare metal, gobbed up weld, grind mark, chip in the surface, etc) and get false indications if you're not careful.

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    Senior Member sandeggo's Avatar
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    Quote Originally Posted by Lildave View Post
    My former job was in NDT and I used to do Mag Testing every day... Those look just fine. If you watched him do the test, he should have applied the spray twice using the electro magnet in two different angles like an X pattern. What happens is... There is a fine metal powder that rushes back and fourth from prod to prod, and will get caught up in, or gather up at a crack (short and simple explanation) and the crack (indication as we had to call it) has to be perpendicular to the prods so that the powder goes accross it (the reason for 2 applications in an X pattern) or it won't show up very well sometimes. That same powder will gather up at any rough edge (paint to bare metal, gobbed up weld, grind mark, chip in the surface, etc) and get false indications if you're not careful.
    And also why it's sometimes difficult to find transverse cracks.

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    Senior Member Lildave's Avatar
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    Very true!

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    The guy that checked it does this on forged blades for turbine engines, I didn't question his method. I would hope he did it right.

    I didn't weld it, so I can't really say why it was done this way.

    The vertical rails mic'd in at .195, so they're thick.

    Thanks for the help.

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