November 5, 2012
Shielding gases do more than just protect the weld from atmospheric contamination. The gas and gas blends you use also influence the weld profile and the weld bead shape. Also, for an arc to occur in gas metal arc welding (GMAW), an ionized gas must be present to carry the charge.
February 19, 2001
Plasma arc welding sometimes offers greater welding speed than gas tungsten arc welding at lower cost than laser beam welding.