1. The composition of electrode

The electrode is composed of coating and core. The melting speed of coating and core should be uniform, and the melting speed is slower than that of core.

Two. Specification of electrode

Electrodes have different diameters and lengths. In general, the diameter of electrodes is selected according to the thickness of the components. The diameters of commonly used electrodes are as follows:

They are 1.6, 2, 2.5, 3.2, 4 and 5 respectively.

Three. Electrodes are classified according to their usage.

1. Structural steel electrodes: carbon steel electrodes and some low alloy steel electrodes.

2. Molybdenum and chromium-molybdenum heat-resistant steel electrode: The weld metal of this kind of electrode has different degree of high temperature resistance.

3. Stainless steel electrode: The weld metal of this kind of electrode has different degree of atmospheric resistance or corrosion resistance in normal temperature, high temperature or low temperature.

4. surfacing electrode: The surfacing layer on the weld metal surface of this kind of electrode has different wear resistance or corrosion resistance at room temperature or high temperature.

5. Low temperature steel welding rod: the weld metal of this kind of electrode has certain ability to work at low temperature.

6. Cast iron electrode: this kind of electrode is special welding rod for welding cast iron or welding cast iron.

7. Nickel and nickel alloy electrode: This kind of electrode is used for nickel and nickel alloy welding, also can be used for dissimilar metal welding and surfacing.

8. Copper and Copper Alloy Electrodes: These electrodes are used for welding of copper and copper alloys, for welding and surfacing of dissimilar metals, and for welding and repairing of cast iron.

9, aluminum and aluminum alloy electrode: this kind of electrode is used for welding, welding and welding of aluminum and aluminum alloy.

10. Special purpose electrode