Arc Covered Electrode Classification System Pg.2 - Airgas.com

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Arc Classification System Page 2
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Comparitive Index of Mild Steel & Low Hydrogen Electrodes
AWS Class Radnor Hobart Airco ESAB Lincoln McKay
E6010 6010 Pipemaster 60 Pipecraft SW-10P Fleetweld 5P 6010 PM
E6011 6011 335A 6011 SW-14 Fleetweld 35 6011
E6013 6013 447A 6013 SW-15 Fleetweld 37 6013
E7014 7014 14A 7014 SW-15IP Fleetweld 47 7014
E7018 7018 418 Easy Arc 7018MR 7018 Jetweld LH-70, LH-73 -
E7018 7018AC 18AC Easy Arc 7018AC Atom Arc 7018AC Murex 7018AC, 7018AC 7018AC


8 Factors to Consider When Selecting Electrodes

1. Base Metal Strength Properties — Know and match mechanical properties. Mild steel – generally E60xx or E70xx electrodes match base metal. Low alloy steel – select electrodes that match base metal composition.

2. Base Metal Composition — Know and match composition. Mild steel – any E60xx or E70xx electrode is satisfactory. Low alloy steel – select electrode that most closely matches base metal composition.

3. Welding Position — Match electrode to welding position encountered.

4. Welding Current — Match power supply available. Observe correct polarity for electrodes.
5. Joint Design and Fit-Up — Select for penetration characteristic – digging, medium, or light. No beveling or tight fit-up – use digging. Thin material or wide root opening – light, soft arc.

6. Thickness and Shape of Base Metal — To avoid weld cracking on thick and heavy material of complicated design, select electrode with maximum ductility. Low hydrogen processes or electrodes are recommended.

7. Service Condition And/Or Specifications — Determine service conditions – Low temperature, high temperature, shock loading – match base metal composition, ductility and impact resistance. Use low hydrogen process. Also, check welding procedure or specification for electrode type.

8. Production Efficiency and Job Conditions — For high-deposition and most efficient production under flat position requirements, select high iron powder types or large diameter electrodes: For other conditions,you may need to experiment with various electrodes and sizes.