What thickness steel for repairs?

Discussion in 'Body' started by Dor Matt, Aug 9, 2016.

  1. Dor Matt

    Dor Matt Active Member

    Messages:
    141
    Location:
    Killarney Heights NSW
    as above, I'm in the vicinity of Edcon steel, going to pick up a sheet of steel to repair a few rust spots, on front wheel tub near seatbelt mount and underside of front doors.
    I was wanting to know what thickness and whether or not to get galvanised. I don't mind having to grind back a bit of the surface where I'm welding if it means I've got gal metal in a spot that is prone to rust, but if people have thoughts as to whether it's worth the extra effort or not, I'm all ears.
    Thanks guys and gals.
    Matt.
     
  2. twincabay

    twincabay Active Member

    Messages:
    555
    Location:
    port maquarie
    1.2 mm gal is worth the effort
     
  3. Mellow Yellow 74

    Mellow Yellow 74 Active Member

    Messages:
    777
    Location:
    Sydney
    1mm mild steel, not galvanised
     
  4. twincabay

    twincabay Active Member

    Messages:
    555
    Location:
    port maquarie
    I would only suggest gal in rust prone areas.
    pretty sure 1.2 gal is 1mm mild plus .2 gal
     
  5. Alpal

    Alpal Moderator Staff Member

    Messages:
    8,246
    Location:
    Melbourne Bend of Islands
    If you go gal make sure good ventilation when welding. Gal gives of nasty fumes!
     
  6. Dor Matt

    Dor Matt Active Member

    Messages:
    141
    Location:
    Killarney Heights NSW
    Thanks all, I took a stab and got 0.9mm, and not gal. Will that do, or am I better off getting 1mm? I only got a 600x1200mm piece so it wasn't a huge investment.
     
  7. cbus

    cbus Well-Known Member

    Messages:
    10,661
    Location:
    sunshine coast
    Dont use gal.
    You need to treat and rustproof inside after regardless.
    0.9 black or zincanneal is usual panel thickness or 1.2 for heavier sections.

    A bunch of offcuts are handy and cheap.
    Gives you a mix of straight edges to play with.
     
    nils and StevieVW like this.
  8. Dor Matt

    Dor Matt Active Member

    Messages:
    141
    Location:
    Killarney Heights NSW
    Cheers Cbus, I got 0.9 black, no off its there so I got a piece big enough to do plenty of patches. What do you recommend I use to treat and rustproof my repairs?
     
  9. StevieVW

    StevieVW Well-Known Member

    Messages:
    3,473
    Location:
    Somerset, Tasmania
    Zincanneal gets my vote!
     
    grumble and Tin Bits like this.
  10. Dor Matt

    Dor Matt Active Member

    Messages:
    141
    Location:
    Killarney Heights NSW
    What is zinc anneal exactly?
     
  11. rstucke

    rstucke Well-Known Member

    Messages:
    498
    Location:
    Wamberal NSW AUS
    IMHO .9 is ok. Weld through paint prior and to finish (zinc rich).
    Rick
     
  12. peter915

    peter915 Active Member

    Messages:
    629
    Location:
    Sunshine coast
    A clever trick if your quick is to use a Zinc stick on the weld while its still hot.
    But its only good if you are sure of the weld and not on a finished surface. (exterior painted panel for example)
    Rub the metal with a Zinc stick and then brush it over with a Stainless Steel wire brush to spread the molten zinc over the weld area.
    Its not perfect but it does help.
    Best paint by 300% is POR15
    Peter
     
  13. Dor Matt

    Dor Matt Active Member

    Messages:
    141
    Location:
    Killarney Heights NSW
    Thanks again guys. Btw anyone know an online supplier where I can get some of those trick little clamps with the tongue that goes in the gap between the two pieces being welded?
     
  14. nils

    nils Well-Known Member

    Messages:
    1,350
    Location:
    newcastle
    The process is much like hot dip galvanizing with an after process heating the metal (much like annealing) to break the zink particles down to smaller flecks than plain galvanizing. The resulting coat is thinner than gal but pretty much the same on a basic chemical level. Except you can weld it with a mig no drama, a tig still acts up a little but its ok.
    . The resulting weld would not be pure enough for major structural application, but no part on our cars falls into the category
     
  15. Dor Matt

    Dor Matt Active Member

    Messages:
    141
    Location:
    Killarney Heights NSW
    Thanks for the explanation Nils, I think I'll try and get some.
     
    nils likes this.
  16. Ted2

    Ted2 Member

    Messages:
    162
    Location:
    Canberra
    Called Butt welding clamps. Can get them on eBay.
     
  17. nils

    nils Well-Known Member

    Messages:
    1,350
    Location:
    newcastle
    X2
     
  18. lawso21

    lawso21 Member

    Messages:
    562
    Location:
    Newcastle /Merewether
    Hi
    I made up a few of the butt cosmos out of 20 mm square aluminium a few bolts and washers, I will post some pictures over the weekend.
    They worked really well
    Cheers
    Adam
     
  19. Blunderbus

    Blunderbus Active Member

    Messages:
    542
    Location:
    St Helena, Melbourne .
    Lucky i read this before i asked the same question, is the original steel 0.9 as well or just the closest size that's easy to get ?
     
  20. Wayne murray

    Wayne murray Well-Known Member

    Messages:
    1,562
    Location:
    Seven hills
    I think you are properly right. I don't know if you can buy it at 0.9mm mild steel.
     

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