• Productivity: The weight of weld metal deposited per hour arc time
• Electrode efficiency or metal recovery: The
weight of weld metal deposited in relation to
the weight of core wire consumed.
The higher the welding current that can be used on
any job, the higher is the productivity. All deposition data given in this catalogue have been obtained
using the maximum recommended current for the
electrode. Use of a larger diameter electrode results
in increased productivity as does using electrodes
with iron powder in the coating.
An electrode without any iron powder in the coating
gives a recovery factor of about 90%. The loss occurs as spatter onto the plate and oxidation losses
into the slag covering.
With iron powder added to the coating the metal
recovery can be increased. Electrodes with a recovery factor above about 130% are normally termed
”high recovery”. A common high recovery figure
is around 180%, but there are electrodes giving
recoveries of up to 250%.
Ø 3.25 : H = 1.2 kg/h
Ø 5.0 : H = 2.7 kg/h
Ø 3,25 : H = 2.5 kg/h
Ø 5.0 : H = 5.3 kg/h
The deposition coefficient for a cored wire varies
between 0.85-0.95, depending on the different types
i.e. deposition efficiency is between 85-95%. The
exact efficiency figure for each cored wire is indicated on the respective product page in the catalogue,
together with a deposition productivity diagram.
Elga’s mild steel high recovery electrodes are called
The deposition coefficient for a solid wire is about
• Deposition Coefficient N: The weight of weld
metal deposited in relation to the weight of
For covered electrodes N is normally around 0.7 i.e.
if you weld 1 kg of electrodes you end up with 0.7
kg of weld metal. N is useful when calculating the
e.g. If 5 kg of weld metal is required to complete a
given job, then the actual electrode consumption
would be 5 ÷ 0.7 = 7.1 kg