Arc Covered Electrode Classification System Pg.2

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

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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.

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