Welding Certification test Q&A and tips and tricks
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ebranden
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    Wed Dec 28, 2011 10:19 pm

What causes porosity in welds?
The most common, to the real odd ball stuff, that gets overlooked during set up, before welding starts
Greg From K/W
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    Sun Nov 27, 2011 8:55 pm

If your using welding rods then dirt and rust will cause it. As well as oil and grease. Water saturation in the coating on the rod.

If your talking about mig welding dirt on the base metal could do it. Rust might but you never know. Lets wait and see what the others say about it.
BlackCatBonz
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    Fri Nov 18, 2011 3:41 am
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    Toronto

ebranden wrote:What causes porosity in welds?
The most common, to the real odd ball stuff, that gets overlooked during set up, before welding starts
Arc length too long, dirty material, bad technique
Shawn Bailey

Sprinklerfitter Guru / Steamfitter Apprentice / Welder
TheExpert

Porosity in welding is a result of dissolved gases or gases released during the welding process, being trapped in the metal when there is insufficient time to escape prior to solidification.
karir
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    Wed Dec 28, 2011 8:36 pm

another big cause of porosity is cold starts! what i mean is striking an arc and moving forward too quickly. when u strike,you need to wait a second for arc to stabilize,then move your rod in a circular motion in place a couple times and then progress. this should prevent any chance of creating porosity.
Jarrod
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    Sun Jul 29, 2018 1:50 pm

1. Clean the weld area of all rust and mill scale.
2. Use only a newly opened box of rods.
3. Keep a tight arc.
4. Follow other tips given in this thread. There ia alot
of good advice from others.
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