Comparison Between Welding Electrode 6013 and 7018:
Welding electrodes are metal wires with a flux coating that melt and fuse two pieces of metal together. Two common types of welding electrodes are the 6013 and 7018. The 6013 electrode is a general-purpose welding electrode used for welding mild steel, galvanized steel, and some low alloy steels. The 7018 electrode is a low hydrogen welding electrode used for welding high-strength, low-alloy steels, carbon steels, and some low alloy steels in high-stress environments such as pressure vessels, pipelines, and structural steel fabrication.
The 6013 electrode has a high cellulose potassium coating with iron powder in the coating. It can be used with either alternating current (AC) or direct current positive (DC+) power sources. The 7018 electrode has a low hydrogen potassium coating with iron powder and other elements such as nickel and molybdenum in the coating. It is also used with AC or DC+ power sources.
Before welding with either electrode, the surface must be cleaned and free of any contaminants, such as rust or oil. However, the 7018 electrode requires preheating for thick materials, and a low hydrogen rod oven should be used to prevent moisture absorption into the coating.
Tabular Comparison Between Welding Electrode 6013 and 7018:
| Welding Electrode | 6013 | 7018 |
|---|---|---|
| Welding Position | All Positions | Flat, Horizontal, Vertical, Overhead |
| Current Type | AC or DC+ | AC or DC+ |
| Diameter Sizes | 1/16 to 5/32 inches | 3/32 to 1/4 inches |
| Tensile Strength | 60,000 psi | 70,000 psi |
| Typical Applications | General purpose welding, sheet metal work, maintenance and repair | Heavy-duty welding, structural steel fabrication, pressure vessels, pipelines |
| Material Composition | High cellulose potassium-coated electrode with iron powder in the coating. | Low hydrogen potassium-coated electrode with iron powder and other elements such as nickel and molybdenum in the coating. |
| Suitable For | General purpose welding of mild steel, galvanized iron, and some low alloy steels. | Heavy-duty welding of high-strength, low-alloy steels, carbon steels, and some low alloy steels. Suitable for use in high-stress environments such as pressure vessels, pipelines, and structural steel fabrication. |
| Preparation Before Welding | Surface must be cleaned and free of any contaminants, such as rust or oil. No preheating is required. | Surface must be cleaned and free of any contaminants, such as rust or oil. Preheating is recommended for thick materials, and a low hydrogen rod oven should be used to prevent moisture absorption into the coating. |
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