Mahmoud Abbas, Mohamed Zaki, Bassam Ghareeb
Suez University, Faculty of Petroleum and Mining Engineering, Metallurgical and Material Engineering, Dep. Assalam City, Suez, P.O. Box 43533, Egypt.
H. Abdelaleem,
Welding Technology and NDT Dept, Central Metallurgical Research and Development Institutes, P.O. Box 87 Helwan, 11722, Egypt.