Electrode Selection

Electrode Selection  
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) or 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 unbeveled joints. Use light penetration electrodes for poor fit-up and thin material.
6.Observe service conditions and select electrode accordingly — High temperature, low temperature, corrosive atmosphere, impact loading. These conditions are best met by using low  hydrogen electrodes.  
7.Consider  welding costs — Highest deposition rate is in the flat position. Use high iron power electrodes to further increase deposition. By far,  the largest factor is labor and overhead.