Copyright Goodheart-Willcox Co., Inc. Chapter 17 Welding Procedures, Defects, and Corrective Actions 153 Excessive penetration. Weld metal that penetrates beyond the bottom of the normal weld root contour. How to correct: • Decrease the root opening. • Increase the root face. • Increase the travel speed. • Decrease the amperage. • Increase the voltage. • Change the gun angle. • Increase the electrode stickout. Excessive spatter. Little droplets of fi ller metal expelled from the weld pool that solidify on the surface of the fi weld and base metal. How to correct: • Decrease the voltage. • Decrease the drag angle. • Decrease the travel speed. • Increase the electrode stickout. • Decrease the electrode feed speed. • Use an antispatter spray. • Do not use CO2 for GMAW on steel. • Use the pull technique for GMAW. Worm tracks. Surface voids usually between 1/4″ to 1″ ″ in length found beneath the slag covering of FCAW-G ″ welds. Shielding gas pockets that are trapped beneath the slag coating as it hardens form these surface voids. How to correct: • Decrease the drag angle. • Decrease the travel speed. • Increase the electrode stickout. • Decrease the electrode feed speed. • Decrease the shielding gas flow rate. fl • Use the pull technique for FCAW-G. Fillet Weld Defects Lack of penetration. Insuffi weld metal penetration into the joint intersection. ficient How to correct: • Decrease the gun travel angle. • Increase the amperage. • Decrease the voltage. • Decrease the size of the weld deposit. • Use stringer beads. • Do not make weave beads on root passes. Goodheart-Willcox Publisher Goodheart-Willcox Publisher Goodheart-Willcox Publisher Goodheart-Willcox Publisher