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What Is MIG Welding Gas? It’s Key to the Best Welds

It’s easy to overlook the vital role MIG welding gas plays in creating a good weld. 

When starting out with MIG, or gas metal arc welding (GMAW), I thought it was cool how the current, filler wire, and the shielding gas all feed through one cable. Pull the trigger and make welds.

And as long as everything works as it should, you have an excellent shot at making a clean, reliable weld with MIG.

I never gave a second thought to the welding gas. Until the first time I forgot to open the gas valve and discovered how ugly an unshielded weld could be.

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