الفهرس 
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Abstract
Wear of the repaired oarts ,by welding, operated under
sliding or frictional motion lS an industrial problem
which worth to be studied. As long welding crea~es a
st:ructural inhencgenity El the repaired parts, then one
should expect a change In the mechanical behaviour In
this oart.
The ’Ilear behaviour of
different structures which
could be available after the welding process of the
employed A1Gl-Tl steel was studied. These structures
are
1) dominated pearlite-ferrite of the as-received
material(158HV) i
2) combined structures of different weld zones (mainly
pearlite-ferrite, bainite and martensite) produced by
filling a notch in the base metal using a welding
electrode of the type E7rrlO-Tl(158HV-248HV) i
3) dominated martensite produced by using the weld
deposit of fusion zone only (248HV); and
4) dominated bainite produced by heating the as-received
structure to 10DGC followed by a cooling rate of
approximately 120 CjS(235HV).
The wear test was conducted using the pin-on-disc
technique in which each pln with known weight and
apparent surface area was loaded by the preset weight in
3)
drv con tac ’. ao e i n s t th”, ro t.e t :nc h a r de r disc (350HV) for a fixed
time. This procedure was repeci~ed for all pJO sets of different
structures.
Atten~ion was paid to
-F~
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test
conditions
the
through
cont.ro l I ina the Da r ame t.e r-s wh rch are affect i ne the wea r process
such as speeo,
surrounding cemperature and the
cont:.act time,
initial surface roughness.
The wear behaviour of t he different tested structures was
f o l Lowec UC oy 5 t udv i nc and examining the obtained d a t a or the
and
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t.h--
rnetallography of the worn surrace.
The wear t e s t o e t a for all the studieci s t r uc t u r e s snoweo
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conclude
phases
as
such
the
of
that
oresence