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It also requires some know-how about stick electrodes (also called welding rods).Welding electrodes are metal wires with baked on chemical coatings. The rod is used to sustain the welding arc and to provide the filler metal required for the joint to be welded. The coating protects the metal from damage, stabilizes the arc, and improves the weld.
Classifications take the form of numbers and letters printed on the sides of stick electrodes, and each represents specific electrode properties.
The letter "E" indicates an electrode.
The first two digits represent the resulting weld's minimum tensile strength, measured in pounds per square inch (psi). For example, the number 70 in a E7018 electrode indicates that the electrode will produce a weld bead with a minimum tensile strength of 70,000 psi.
The third digit represents the welding position(s) for which the electrode can be used.
The fourth digit represents the coating type and the type of welding current (AC, DC or both) that can be used with the electrode.
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