الفهرس 
LITERATURE SURVEYOnly 14 pages are availabe for public view
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Abstract
The aim of this work was dictated from the lack of kn?wledge
existing among the previous literatures about the newly
originated pulsed GTAW process, specialy its use as cracking
eliminator.
The research is therefore aiming at studying the effect of
variables of this process when applied to fully austenitic
stainless steel on its cracking susceptibility. The pulse form
variables (frequency, time ratio, pulse current, rest current,
and current ratio with constant welding power) construct the
core of-this study.
The research starts with
between these variables,
a study of the functional coherence
and theic effects on the welding
electrical work, power, and heat energy.
Considering the shape, size, and structure of the resulted
welded bead, they a~e studied in this work at the three
orthogonal reference’ planes of the bead, for different
~onditions of the pulse form varaibles.
The effects of these variables on the material cracking
susceptibility are obtianed using the Fan-shape specimen as
cracking test specimen, and are interpreted using their effects
on the bead shape/size, and structure. The optimum conditions
of the pulse form variables are determined on the basis of the
maximum crack length.
transverse
beads
The weld
strength,
properties, e.g. microhardness,
longitudinal tensile strength, and
tensile
mechanical
impact energy absorption are determined and related to their
macro - as well as micro-structures The high speed pho t.o q r ap hy technique is used to obtain a
cronogr-aph for- the solidification pr-ocess of the pulsed GTAW,
which ”helped in establishing a pr-oposed mechanism for- the cr-ack
for-mation when applying the pulsed GTAW for the Fan-shape
spec i me n.