Discussion in 'Reverse Flow' started by bad to the bonz, Feb 13, 2014.

  1. how big of a hole do I need to drill to make blind welds
  2. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    Depends on what you are welding with and thickness of the material...
  3. it is 1/8"x 1/4"x1.5"
  4. I drilled 1/4" holes in my 1/8" flanges for the blind welds. This worked out great. Any larger and you have too much void to fill. Any smaller and I didn't feel like I grabbed enough metal to make the weld stick...
    Last edited: Feb 13, 2014
  5. maple sticks

    maple sticks Smoking Fanatic

    I think your asking if a 1/4" hole in 1/8" flat stock that is 1.5" wide, yes if you use a hot welder. Use rod with little flux like 6010 or 6011. If your using a wire feed turn it higher than you normally would to weld 1/8'. You will find the hole fills quickly.

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