Effect of widmansttaten structure on properties of submerged arc

مقدم أطروحة جامعية

Mubel, Umar Athir

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم هندسة الإنتاج و المعادن

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2004

الملخص الإنجليزي

The present work encompasses studying the effect of Widmansttaten tructure (microstructure consists of the side plate ferrite in matrix of ferrite and inearlite) on the elements which are done by Submerged Arc Welding (SAW) studying the effect of welding variables (welding joint design, welding current, arc voltage, wire feed speed and travel speed) on the microstructure of I weld metai and Heat Affected Zone (HAZ The experimental work consists welding of low carbon steel plate (ASTM A 516 grade 70) that is widely used in heavy industries.

The welding operation is done by using electrode (AWS F60-EM12K) the welding joint design included of three different joints.

From analysis of results of mechanical tests (hardness test and C harpy impact test) and metallography examination lord microstructure -of weld metal and Heat Affected Zone (HAZ), the formation of Widmansttaten structure depends on the value of heat input during welding.

The increasing, of welding current from 450 to 600 Amperes, causes increasing in grain size of side plate ferrite (Widmansttaten).

Also, the effect of welding joint design is appeared at the increasing of weld metal and number of passes, which causes increasing of heat input and that, is followed by increasing in grain size of side plate ferrite (Widmansttaten).

التخصصات الرئيسية

الهندسة الكهربائية

الموضوعات

• اللحام

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305825