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.
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