Lesson 3 - Covered Electrodes for Welding Mild Steels

3.3.2.1 Classifications E6010, E6011 and E6027 weld metals are required to have more than 62,000 psi tensile strength, 50,000 psi yield strength, 22% elongation in two inch gauge, and 20 ft-lb at -20°F Charpy V-notch impact. 3.3.2.2 Classification E6020 weld metals are required to have more than 62,000 psi tensile strength, 50,000 psi yield strength, 22% elongation in two inch gauge, and no Charpy V-notch impact requirements. 3.3.2.3 Classifications E6012 and E6013 weld metals are required to have more than 67,000 psi tensile strength, 55,000 psi yield strength, 17% elongation in two inch gauge, and no Charpy V-notch impact requirements. 3.3.2.4 Classification E6022 weld metals are required to have more than 67,000 psi tensile strength, no requirement for yield strength and no Charpy V-notch requirements. 3.3.2.5 Classifications E7014 and E7024 weld metals are required to have more than 72,000 psi tensile strength, 60,000 psi yield strength, 17% elongation in two inch gauge, and no Charpy V-notch impact requirements. 3.3.2.6 Classifications E7015, E7016, E7018, D7027 and E7048 are required to have more than 72,000 psi tensile strength, 60,000 psi yield strength, 22% elongation in two inch gauge, and 20 ft-lb at -20°F Charpy V-notch impacts. 3.3.2.7 Classification E7028 is required to have more than 72,000 psi tensile strength, 60,000 psi yield strength, 22% elongation in two inch gauge, and 20 ft-lb at 0°F Charpy V- notch impacts. 3.3.3 Individual Electrode Characteristics a) E6010 electrodes were originally developed to provide improved welding operation and weld metal. The coating is mostly wood pulp or flour modified with mineral silicates, deoxidizers, and sodium silicate. The amount of coating on the electrode is low, about 10-12% by weight. Because the wood pulp burns away during welding, the slag is minimal and is usually easily removed. The arc has deep penetration and with proper manipulation of the arc, good welds can be deposited in all positions. Most of the ships built in the United States during World War II were welded with this classification of electrode. Special formulations of this classification are used to weld line pipe joints in the vertical-down position. Reasonably sound welds can be deposited in open root butt joints (see Appendix A - Glossary) with this electrode.

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