Deposition data

Covered electrodes

•฀ 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%.

e.g.

P 43

P 43

Maxeta 11

Maxeta 11

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

Cored Wires

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

MAXETA.

e.g.

Maxeta 10

135%

Maxeta 11

190%

Maxeta 21

170%

Maxeta 22

240%

Solid Wires

The deposition coefficient for a solid wire is about

0.96.

•฀ Deposition Coefficient N: The weight of weld

metal deposited in relation to the weight of

electrode consumed.

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

electrode consumption.

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

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