Troubleshooting the GMAW Process: This month's AWS Journal

Although many people tout gas metal arc welding (GMAW) as an "all-in-one" solution, that doesn't mean it's a magic remedy for eliminating your welding problems. this article examines common pitfalls encountered during the normal course of GMA welding, along with trusted ways to correct them. More here...

Porosity is a small pocket of gas caught in the weld metal that can appear at any specific point on the weld or along its full length. This discontinuity
whether internal or on the surface of the weld bead significantly weakens the structural integrity of any weld. Inadequate shielding gas coverage is a common cause of porosity and is easily corrected by taking some or all of the following measures.