Dept. of Inorganic Chemistry
Room # C 429
Arrehenius Labortary,Stockholm University
S-10691, Stockholm , Sweden.
sali@inorg.su.se,alisharafat@hotmail.com
+46 (0) 736 434 823 ,Off: +46-08-161258
Master of Science in Materia Science and Materiall Processing Technology (2000 to 2002)
Marks: Good grades
Islamic Institute of Technology Dhaka, Bangladesh.
Higher Diploma in Mechanical Engineering (1996 to 1999)
Marks: CGPA 3.69, 1st Div 73.8 %.
Islamia College Peshawar, Pakistan.
FSc. (Pre Engineering) 1995
Marks: 793/1100, 1st Div 72.1%.
Coursework
Worked as a research engineer in project "Study of welding consumbles for high strength steel"
with effect from 01/04/2003 to 20/08/2003
Volvo Wheel Loaders AB, Arvika, Sweden.
Worked as a research engineer in project "Qualitative and Quantitative analysis of Tandem Arc Welding "
with effect from 15/04/2002 to 01/11/2002.
ESAB Welding Equipment AB, Laxå, Sweden.
Worked on Master thesis in Project ";Search for relations in MIG/MAG Synergic data between different wire diameters"
with effect from 01/04/2001 to 15/01/2002.
Bangladesh Fertilizer Company Ltd, Bangladesh.
Worked as trainee Engineer in Fertilizer Industry during 1998 in Bangladesh Fertilizer Industry, Gorishal.
Memberships
Student member, Registration Membership No. 510342
The Welding and Joining Society
Student member, Registration Membership No. S 2678
Cost reduction is one of the most important challenges for the Swedish (global) industries. Welding costs has a great influence of the total product cost in Construction Equipment Products i.e. Wheel Loaders, Dum Trucks, Excavators etc.
With the robot welding process Tandem Arc Welding technology a very productive welding process is available on the market. It is characterised by the arrangement
of two wires in a special gas nozzle. On account of this a considerable increase of welding speed (m/min) by simultaneous increase of deposition rate (Kg/h) is achieved. This work will give a technical and economical survey over the process development made to present state of Tandem Arc welding process used at the Core Plant of Volvo Wheel Loaders AB, The Arvika Plant. The Tandem Arc welding process uses two power sources and two electrically separate contact tubes in a special gas nozzle. Because of that at both wire electrodes an independent adjustment of welding parameters is possible.
n the first part of the project the attention will be paid to replace one of the solid wire (the tail wire) by metal cored wire (MCAW), and the second part of the project the parent material will be changed from"C-Mn steel" (300 MPa) to "High Strength Steel" (600 - 700 MPa). With these changes the welding speed will be increased from 0.8 m/min to 1.2 m/min and the welding cost will be reduced approximately 30%. Moreover, essential changing to the present process, new research results and industrial applications will be presented connected to welding quality, according to The Volvo Corporate Standard 5605,51, welding classes (1S0 5817) and the weld defect "cold lap" will be studied in co-operative projects.
This work demonstrates relations in MIG/MAG synergy data between different wire diameters. The work was carried out at the Royal Institute of Technology department of Welding Technology and the ESAB Welding Equipment AB Laxå Sweden. The important work of the thesis was to define the effects of wire diameters on the synergic relations in MIG/MAG welding in order to reduce the amount of work carried out by the welder. The previous experimental synergic data was analysed successfully by using two different approaches i.e. "Least Square Method" and "Exponential Function Method". Through this thesis work, it was noted that slope of the synergic relations increases with increasing wire diameter, while intercept of the synergic relations decreases with increasing wire diameter in most cases. Wrong synergic relations can be identify only by using the "Least Square Method" of the above mentioned two methods. It was also found that in the "Exponential Function Method", different materials have different value of exponential constant. It was also noted that between two methods, the "Least Square Method" was more reliable.
Will be Published soon.....
