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Register a new userRefusion the boundaries of weld's reinforcement using TIG , and it's influence on the mechanical properties and micro-structure of welded joints
معالجة حدود الدرزات اللحامية بالقوس الكهربائي اليدوي في وسط من غاز الآرغون و تأثيره في الخواص الميكانيكية و البنية البلورية للوصلات اللحامية
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عصام موسى( باحث )
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يتضمن هذا البحث طريقة معالجة حدود الدرزات اللحامية في مناطق التحول بين المعدن الأساس و الدرزات اللحامية، و ذلك من خلال إعادة صهر حدود هذه الدرزات باستخدام القوس الكهربائي اليدوي بإلكترود غير مستهلك (غير منصهر) من معدن التنغستين و في وسط من غاز الآرغون و دون سلك لحام مساعد.
Refusion the boundaries of weld's reinforcement was done using TIG without filler metal .The mechanical properties & micro-structure of various zones in low carbon steel welded joints were studied.
References used
Liewellyn D.T., " Steels : Metallurgy and applications " – 2 Rev.ed. , London , 1994
Harris D. , Priest,A. " Integrity of gas Cylenders ", Materials Technology ", NPL ,1985
" Standard for welding pipelines & Related facilities " API 1104 , 19- th ed., 1999
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Design of experiments (DOE)
had been used in the study, and the results had been evaluated by the
surface response method. The results showed that the welding
current is the main parameter by its effect on the mechanical studied
properties and the parameters values which give the best responses
had been determined.
This research seeks to localize the technology of plasma arc welding (PAW), the best
alternative against tungsten arc welding (TIG). So a quantitative comparison between these
two technologies has been made, according to the particular case that is
DC current.
involving heat efficiency, heat input, tensile strength, relative elongation at fracture, micro
hardness and angular distortion.
Tensile and bending tests modeling have been undertaken for various welded joints
which were different in shape and design. Also, the hot spot stress was calculated at critical
failure areas using the finite elements analysis method. There was a go
od similarity
between experimentally defined critical areas in certain certified literature and those in our
modeling. It appeared that the information listed in the international institute for welding
(IIW) in regards of hot spot stress method gives relatively accurate values for the welded
joints possibility to endure fatigue loading and keep their desired mechanical properties
even those joints that could fail only at the connecting area with the base metal.
This search aims to study the effect of additive materials ( Ethyl Methyl Keton
Peroxide MEKP , Cobalt Naphthenate ) at the important values of (stress-strain) curves
( stress and elongation at break ) for the preparing specimens from reinforced an
d nonreinforced
with fiber glass unsaturated polyester resin.
The result showed that the investigated parameters are clearly affected with using
additive materials and the optimum concentration for non-reinforced specimens which was
curing in room temperature was (1% MEKP + 1% Cobalt Naphthenate) and (0.8% MEKP
+ 1% Cobalt Naphthenate), and for reinforced specimens with fiber glass was:( 1% MEKP
+ 0.8% Cobalt Naphthenate) and ((0.2-0.4) % MEKP + 1% Cobalt Naphthenate).
The results showed also that it is possible to get the better values of tensile stress at
break when the specimens was curing in oven at 100 Cº and treated at this temperature for
15 min.
In this research, has been studied the spread of chromium atoms mechanism, and mechanical and chemical and properties of the diffusion chrome coating layer in low carbon steel, which is considered one of the surface treatment techniques. Where many p
ractical experiences were carried out in the powdery saturation milieu to form a diffusion coating layer containing atomic chromium who will spread inside the painted
surface, and has studied some mechanical and chemical properties after doing diffusion chrome coating.
The tests results showed that the tensile strength and micro hardness and chemical corrosion resistance improved after the diffusion chrome coating, also increased the depth of coating layer By increasing the retention time in the oven and temperature, where this relationship is reflected with curve of the second degree. Conversely ductility decreased.
Search results confirm the possibility of using diffusion chrome coating as a promising treatment in raising the efficiency of machinery elements that prone to oxidation or chemical corrosion in different temperatures.
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