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  1. #1
    Join Date
    Feb 2012
    Location
    Highland, Ca
    Posts
    49

    Default Fusion (Autogeneous) welding.

    In your guys experience, is fusion (Autogeneous) welding of stainless exhaust pipe less durable than normal Tig with filler. Assumming both situations have similar close fit ups. Im asking because guys from a car forum of mine says they would never fusion weld something that they intend to give a warrenty on. Is this the correct way of thinking? or are they just being overly cautious?

  2. #2
    Join Date
    Aug 2010
    Location
    Los Angeles
    Posts
    1,163

    Default

    Yes, it is less strong because the effective throat is reduced creating a stress riser. Conventional wisdom dictates that the weld be stronger than the material side adjacent to it.
    Nothing welded, Nothing gained

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  3. #3
    Join Date
    Feb 2012
    Location
    Highland, Ca
    Posts
    49

    Default

    Ok cool thanks for the reply. I have noticed that while practicing fusion welds i often find im getting a slight undercut look to the side of weld which probably causes a stress point.

    So are there any cases where fusion welds are OK?

  4. #4
    Join Date
    Aug 2010
    Location
    Los Angeles
    Posts
    1,163

    Default

    Quote Originally Posted by TTNickSoCal View Post
    Ok cool thanks for the reply. I have noticed that while practicing fusion welds i often find im getting a slight undercut look to the side of weld which probably causes a stress point.

    So are there any cases where fusion welds are OK?
    Tacking parts in prep for silver braze, hermetically sealing cans, lap joints if approved by design authority and such.

    Basically I just use it for tacking.
    Nothing welded, Nothing gained

    Miller Dynasty700DX
    3 ea. Miller Dynasty350DX
    Miller Dynasty200DX
    ThermalArc 400 GTSW
    MillerMatic350P
    MillerMatic200 with spoolgun
    MKCobraMig260
    Lincoln SP-170T
    Linde UCC305 (sold 2011)
    Hypertherm 1250
    Hypertherm 800
    PlasmaCam CNC cutter
    Fadal Toolroom CNC Mill
    SiberHegner CNC Mill
    2 ea. Bridgeport
    LeBlond 15" Lathe
    Haberle 18" Cold Saw
    Doringer 14" Cold Saw
    6 foot x 12 foot Mojave granite

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