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Influence of welding parameters on the thermal cycle of plasma arc welding

تأثير متغيرات اللحام على الدورة الحرارية للحام بقوس البلازما على صفائح من الفولاذ المقاوم للصدأ

1914   1   108   5.0 ( 1 )
 Publication date 2017
and research's language is العربية
 Created by Shamra Editor




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In this research, a study of the influence of arc welding parameters on the thermal cycle was conducted, where the thermal cycle within the welded plate of stainless steel 304L by plasma arc welding (PAW) with weld-on-plate was measured using thermocouples for several welding parameters (intensity of the welding current, welding velocity, flow rate of plasma gas) and comparing the influence of this parameters on the thermal cycle within the plate.



References used
ROSENTHAL,D 1946 The Theory of Moving Sources of Heat and Its Application of Metal Treatments Transactions of ASME, Vol. 68, 849-866
MYERS,P.S UYEHARA,O.A and BORMAN,G.L 1967 Fundamentals of heat flow in welding Welding Research Council Bulletin, Vol. 123. p1
PAVELIC,V TANBAKUCHI,R UYEHARA,O.A & MYERS,P.S 1969 Experimental and computed temperature histories in gas tungsten-arc welding of thin plates Welding journal, Vol. 48(7). p295
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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.
يهدف هذا البحث الى دراسة تأثير متغيرات اللحام على الدخل الحراري و المردود الحراري و على الدورة الحرارية عند لحام صفائح من الفولاذ المقاوم للصدأ. تم في هذا البحث التعرف على مفاهيم الدخل الحراري و الدورة الحرارية و الاطلاع على النماذج التي توصف انتق ال الحرارة في أثناء عملية اللحام. تم اجراء دراسة على طرائق تحصيل الدخل الحراري شملت المسعرات المائية (البسيط، و المصعدي التدفقي، و المصعدي المغمور) و قد تبين من نتائج القياس التي تم الحصول عليها أن المسعر المائي المصعدي المغمور هو النسب في قراءة قيمة الدخل الحراري.
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.
The aim of this work is to study the effect of the aging heat treatment on the pitting corrosion resistance of martensitic stainless steel. In this research a number of specimens from martensitic stainless steel were subjected to solution treatment a t 1050 for one hour followed by water quenching then aging in the temperatures range (400-750) for different holding times (1-16 hrs). After heat treatment, two types of corrosion tests (accelerated test and immersion test) were conducted. The results obtained in this research showed that the pitting corrosion resistance was affected by Aging temperature and three critical temperatures were found in corrosion test: the specimens aged at 475 0C had maximum corrosion rate. This may be due to the presence of stringer δ- ferrite and precipitation of very fine precipitates which precipitated heterogeneously in the martensitic matrix, which led to an increase in corrosion rate. The specimens aged at temperatures range (550 – 625) 0C had minimum values of corrosion rate, this is attributed to the high volume fraction of retained austenite. The specimens aged at temperatures above 625 had intermediate corrosion rate. The type of pits, which resulted from two pitting corrosion tests, was independent form the form of δ-ferrite and carbides which presence in microstructure.
يهدف البحث إلى دراسة قابلية اللحام للصلب المقاوم للصدأ المــزدوج نوع (S31803-2205-SAF) ، و مقارنته بسلوك الصلب الاوستينايتي(304 AISI-S30400) عند اللحام أولاً بطريقة لحام القوس الكهربائي لقطب التنكستن باستعمال الغاز الواقي(TIG) اليدوية بتسليط حرارات د اخلة تتراوح ما بين (110-450) جول/ملم دون استخدام حشوات لحام.

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