The following points should be considered when selecting the proper coated electrode.
1.Match the mechanical properties of the base metal.
2.Match the chemical composition of the base metal as closely as possible.
3.Match electrode to available power supply AC or DCEN (electrode negative) DCEP (electrode positive).
4.Match the electrode to the position of the weld.
5.Observe joint design - Use deep penetrating electrodes for tight fit-up and Use light penetration electrodes for poor fit-up and thin material.
6.Observe service conditions and select electrode accordingly - High temperature, corrosive atmosphere, impact loading. These conditions are best met by using right electrodes.
7.Consider welding costs - Highest deposition rate is in the flat position. Use electrodes to further increase deposition. By far, the largest factor is labor and cost.
