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Thread: welding issues

  1. #1
    Official RnS Addict chris's Avatar
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    welding issues

    i think iv forgotten how to weld !!

    either that or theres some mystical art to (mig) welding a tank and making it leak free that i'v not come across before !

    whats the trick ??

    iv got an old air tank off a truck to use as a fuel tank and it needed each end capping off, have done that but i cant for the life of me stop it leaking from the welds, iv ground it down and re-welded a couple of times now but all i seem to do is manage to move the leak further round the tank - stupid bloody thing !!

    what am i doing wrong or is it time to borrow some kit and just gas weld it ?

    cheers

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    Official RnS Addict farncombe pop's Avatar
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    Chris i'm no expert but if i have my mig to high [ to hot ] and cut open a weld it looks like an aero bar inside,

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    Official RnS Addict cabby's Avatar
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    Another problem with mig is its pourus

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  6. #4
    Official RnS Addict farncombe pop's Avatar
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    Quote Originally Posted by cabby View Post
    Another problem with mig is its pourus
    Really? perhaps there meant to look like that inside? was a strong weld !

  7. #5
    Compulsive chicken choker English Impala's Avatar
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    Chris, buy a tank sealing kit from Frost, it lines the tank with a kind of petrol resistant resin and is supposed to be very good.

  8. #6
    Off the Xmas card list kapri's Avatar
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    The problem with mig is that every time you stop a weld it leaves a small central hole and it will leak. When we used to repair them they were always solder sweated repairs. We didn't use weld as it caused instant corrosion inside the tank plus lots of distortion.

    Tig is best for a tank but if you use mig then you need to solder sweat the finished welds to make sure it doesn't leak.

  9. #7

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    You can MIG a tank but you have to know what your doing and be good at it, MIG welded the tank on my T 10 years ago and its never leaked. Much easier to gas weld or TIG though.

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    Do it right first time and you won't need it Gary

    Quote Originally Posted by English Impala View Post
    Chris, buy a tank sealing kit from Frost, it lines the tank with a kind of petrol resistant resin and is supposed to be very good.

  11. #9
    Administrator blackpopracing's Avatar
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    Quote Originally Posted by farncombe pop View Post
    Chris i'm no expert but if i have my mig to high [ to hot ] and cut open a weld it looks like an aero bar inside,
    That also means not enough gas or a contaminated weld.

  12. #10
    Compulsive chicken choker English Impala's Avatar
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    Or add corn-flower to your petrol to thicken it up a bit.

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