- Thread starter dunc78
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KemppiFrog
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Looks like the stuff when I forget to turn the gas on. Or it is running out. SO, prob a draft/wind prob?
KF
KF
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Porosity is caused by one or more of the following:
1. Dirty material/contamination with oil, grease, paint or similar
2. Gust of wind blowing away your shielding gas (someone too close to you with a grinder is a favorite).
3. Gas flow rate too low or non existent (Forgot to turn gas on/bottle empty?)
4. Gas flow rate set too high can also cause problems.
5. Shroud full of spatter reducing gas flow rate.
I normally weld at 15 LPM to keep the weld clean, not too precious about saving gas, more important to have a decent clean weld.
1. Dirty material/contamination with oil, grease, paint or similar
2. Gust of wind blowing away your shielding gas (someone too close to you with a grinder is a favorite).
3. Gas flow rate too low or non existent (Forgot to turn gas on/bottle empty?)
4. Gas flow rate set too high can also cause problems.
5. Shroud full of spatter reducing gas flow rate.
I normally weld at 15 LPM to keep the weld clean, not too precious about saving gas, more important to have a decent clean weld.
Last edited:
Thanks for the replys. I was running at about 8lpm i think. I was in my garage, so not too gusty. I picked up the steel as new off cuts from a friends fabrication workshop so may well have oil on.
I will try running at about 12lmp and making sure the metal is free from contamination. Cheers.
I will try running at about 12lmp and making sure the metal is free from contamination. Cheers.
For what it's worth,.I'd totally disregard trying to.read flow rates from the second gauge. Now on my second flowmeter, one that has a rotameter style bullet in it as opposed to just a normal ball bearing, the gauge on my reg is fictitious in it's calibration, and cheap flowmeter not great either. Get a decent flowmeter and get the real story. In their defence, both the cheap flowmeter and the gauge read conservatively, I.e. using more gas than was indicated.
