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It melts. Avoid moisture. To cover the weld. ------ Plus adds alloying ingredients, determines the type of electrical current to be used (AC - DC or either), slows the cooling rate of the puddle to temper the weld, tells you what position you can weld in (flat,horiz,vert,overhead), protects the molten puddle from harmful gasses in the air by creating smoke and slag, determines how much amperage you will need to use, shapes and contours the weld bead and much more.

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12y ago
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10y ago

To get a good seam, you need to protect the melted metal from the oxygen in the air. The coating of the electrodes melts on use and provides that protection. The melted coating also helps in removing oxidization and surface impurities from the metal to be welded.

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Q: What is welding electrode coating do?
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Why e7018 is heated?

There is a coating on electrode. It absorb moisture from an atmosphere. To remove moisture from it, we have to back that electrode up to 300 ' C. If we dont heat this electrode, there is a chance to get discontinuity in welding. Ketan Baraiya


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