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Thread: Q: MIG Welding / Copper Backing

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    metalbender red_metallic's Avatar
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    Default Q: MIG Welding / Copper Backing

    During the weld-up process for some torch cut receivers there is copper stock backing up the weld area.

    Why is this so?

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    GuncoHolic 555th's Avatar
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    It acts as a heat sink, also the molten steel will not stick to the copper plate if you happen to burn through the reciever during welding.

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    metalbender red_metallic's Avatar
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    Quote Originally Posted by 555th
    It acts as a heat sink, also the molten steel will not stick to the copper plate if you happen to burn through the reciever during welding.
    That makes sense.

    Do you think aluminum or brass be used in the same way?

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    Administrator pirate56's Avatar
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    it is there to keep oxygen away from the weld.

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    GuncoHolic 555th's Avatar
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    Quote Originally Posted by red_metallic
    That makes sense.

    Do you think aluminum or brass be used in the same way?
    No. You need copper or nothing

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    metalbender red_metallic's Avatar
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    Quote Originally Posted by 555th
    No. You need copper or nothing
    Got it, thank you!

  7. #7
    Gunco Member bert01's Avatar
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    i have used aluminium in the same way for filling holes and such

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    Gunco Member Toolman's Avatar
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    It acts as a heat-sink & as a fixture. The heat-sink is to assist the part being welded from warping & you can help this by not concentrating the weld in only one area. The fixture is used to hold the parts while welding, but, you don't want to weld the part to the fixture. You can also use graphite.
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    Gunco Rookie Fal"O"'s Avatar
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    Brass works fine also, any non ferous metal. Aluminum has a very low melting point.

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