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  1. 10th February 2013, 04:52 PM #1
    BigPete1
    BigPete1 is offline Novice
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    Default Gassless mig / Porosity

    Hi, I'm welding with a gassless mig setup and I'm getting a lot of what appears to be porosity ( holes in the weld bead).

    I have only noticed this problem since I got a new coil of wire the brand is Xcel- arc. The steel I'm welding black angle 30x30x3mm it is not rusty but I haven't removed the millscale.

    Wondering if any one has struck this problem and has a likely cause.

    Thanks Pete.
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  3. 10th February 2013, 10:19 PM #2
    Kevin-R
    Kevin-R is offline Intermediate Member
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    Default Gassless mig / Porosity

    Not had any experiance with "gassless migs. Lots with solid wire and fluxcore (still have a shielding gass) and with the lincon flux cored process (LN8, LN9 LN22 ect) which dont have a shielding gas.
    Porisity is usually caused by gass problems,dirty ,oiley ,rusty parent metal. I have had problems with porisity with The lincon inershield with either wire with rust on it, and once with a bad batch of wire that had inconsisent flux inside the wire. Mostly it is caused by dirt, rust paint ect.
    Hope this helps.
    Kev
  4. 10th February 2013, 11:47 PM #3
    Karl Robbers
    Karl Robbers is offline GOLD MEMBER
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    Default

    What Kevin-R said basically, look for dirt/oil/rust. Mill scale should not be too big an issue unless there are larger than normal amounts.
    Failing this, look at polarity, and faulty wire, (inconsistent flux etc).
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