Welding
Iron powders for welding applications
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W100.25
Due to its irregular particle shape and microporous structure,
this powder has a very large specific surface. This gives
increased conductivity to the electrode coating, resulting
in good arc stability, easy re-ignition and soft arc action.
It is mainly used for thinly coated electrodes with low additions
of iron powder, and for flux-cored wires (FCW).
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W60.28LNC
Specially developed for flux-cored wire. Particle size distribution
is optimized in order to prevent segregation risks and to
ensure a smooth powder flow - important attributes when filling
the wire. Its low carbon- and nitrogen levels (LNC) mean a
soft powder which forms easily in drawing, minimizing risk
of wire breakage. Additionally, it is ideal for the production
of AWS E7018 electrodes, where high demands are placed on
the weld metal's mechanical properties. And the powder's low
carbon levels suit it to the production of stainless steel
electrodes.
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W40.29
This is by far the most commonly used powder for basic low
hydrogen electrodes corresponding to AWS E7018. The powder's
particle shape, density and intermediate particle size distribution
also make it especially suitable for use in other medium deposition
efficiency electrodes (120-170%)
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High apparent density
The following powders are specifically suited for electrodes with
a high addition of iron powder to the coating (55- 70%). They offer
high deposition efficiency at low coating-to-core wire ratios, without
excessive conductivity - which can lead to problems such as "striking
through the coating".
The powders' size, density and smooth particle surface also facilitate
extrusion.
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W40.37
Has a low carbon and iron oxide content, which results in
smooth arc action and a high solidification rate, as well
as easy slag removal. It is especially suited for AWS E7028
basic or Zr-basic electrodes. Under certain conditions, it
is also suitable for low-recovery electrodes.
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W40.37 OX
Has an extremely low carbon content. Subjected to surface
oxidation, it gains a thin but dense coating of iron oxide
(OX), and offers a fluid slag and fine droplet trans-fer.
W40.37 OX is particularly suitable for Zr-basic and basic
electrodes with a high carbonate content in the coating. It
is also recommended for stainless steel electrodes, where
improved arc stability and productivity is desired.
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W40.37 COX
W40.37 COX is particularly recommended for AWS E7024 electrodes.
Its high carbon- and oxide content (COX) facilitates the formation
of finer droplets, helps to eliminate pore formation in the
weld deposit, and ensures decreased levels of silicon and
microslag inclusions.
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