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  1. #1
    Join Date
    Dec 2007
    Location
    Sydney
    Posts
    396

    Default Portable 240v handheld spot welder Sydney

    I am welding back together and adding brackets etc on a small ute tub.
    It was originally .8mm but would now be .5 or less thanks to rust and panel work.
    I have done plug welds with the mig in thicker spots but I’m afraid I’ll blow huge holes in this spot.
    I have 15amp pp if needed.
    The reach needed is only a bit over 150mm.
    Thanks H.
    Jimcracks for the rich and/or wealthy. (aka GKB '88)

  2. #2
    Join Date
    Aug 2010
    Location
    Toorloo Arm, VIC
    Age
    39
    Posts
    1,270

    Default

    If you're wanting a spot welder, I assume you have access to the backside of the weld, so you could use a piece of copper bar/plate as a backer strip to take up some of the heat when using the mig...

    I've found the spot welder can be pretty finicky when you don't have clean virgin material at times (ie: as likely to make holes as to weld, or not weld together due to tiny air gaps), but mine is just an el cheapo....

  3. #3
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default Portable 240v handheld spot welder Sydney

    I agree. Copper backing bar works well for that sort of work - or for filling up old fastener holes in panels.

    Edit: I’ve found using a flattened piece of 1/2” copper pipe works well to get into less accessible spaces.

    Another option would be an adhesive sealant like one of the Sikaflex ones. They a damn strong if you have the appropriate joint situation and have the advantage of sealing up the joint to prevent it rusting again from the inside.

    Steve

  4. #4
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,945

    Default

    I've a cheapo unit also, used mainly for spotting 1.2 galv sheet, without a timer
    The arms can be reasonably deep, making it awkward to get in behind some panels. Also as J&H mentioned they can be VERY finicky even with clean virgin material.
    Kryn
    To grow old is mandatory, growing up is optional.

  5. #5
    Join Date
    Dec 2007
    Location
    Sydney
    Posts
    396

    Default

    Thanks for the replies guys I had a mate from a nearby suburb lend me his el cheapo and it worked fine.
    As a matter of fact it was easier for a mug to use than the real deal 3 phase unit my mates the auto body fabricators have. Their machine has multiple different heads which enables one to reach most areas but the extremely heavy cable and my age and damage to both shoulders made using it a major struggle whilst reattaching the tub chassis locators etc whilst working in their workshop.
    I fugged up welding in one of the inner guards and on getting it home decided to redo it, so I had a few plug welds to do anyway after drilling out previous welds, I have various bits of copper backup scrap and spray areas to be welded with copper spray.
    I might put some photos up in the car resto area.
    H.
    Jimcracks for the rich and/or wealthy. (aka GKB '88)

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