18 Wear-Arc
40 No AWS Classification
AC/DCEP (Electrode Positive)
Electrode Imprint Marking: 40
Hardsurfacing Alloy
Extreme Abrasion & Medium Impact
Description: Wear-Arc
40 has a special core wire and the proper amount of alloys in the coating to produce
a deposit of highly
abrasive resistant chrome carbides in a matrix of iron and chromium. The use of
a special core wire gives
much better arc action and also allows the electrode to operate at higher current
settings. Deposits resist
galling and seizing, and take a high polish when subject to sliding abrasive action.
Wear-Arc 40 is designed for use on
steel mill twist guides, steel mill entry guides, wire guides, conveyor
chain, and agricultural tools. This
electrode also gives excellent service on certain crushing and quarrying
equipment where high abrasive wear
is the primary wear factor. This
alloy has excellent hardness at constant temperatures up to about 1000°F
(538°C). In considering this alloy
for a heat and abrasion application, a constant operating temperature must be
estimated. For example,
a steel mill guide block surface with Wear-Arc 40 withstands exposure to intermittent
contact with hot
billets of bars at temperatures of 1800-2000°F (982-1093°C). This is
possible because sufficient time elapses
between contacts to prevent a high temperature build-up.
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