Courses

Welding Technology

General

Course Contents

Introduction. Types of welds. Symbolism of welds. Energy sources for welding. Electrical sources. Arc welding. TIG. MIG. Resistance welding. Electroslag welding. Chemical sources. Oxyfuel gas welding. Thermit welding. Optical sources Electron Beam welding. Laser beam welding. Solid state sources. Explosion welding. Ultrasonic welding. Friction welding. Diffusion welding. Electrode. Characteristics of the welding arc. Metallurgy of welds. Metal transfer. Thermal phenomena during welding. Heat flow in welding. Distribution of temperature. Remaining stresses and deformations. Peak temperatures distribution. Cooling rates. Solidification rates. Weld thermal cycle. Quality welding control (destructive and non-destructive control methods). Cracks. Geometric discontinuities. Lack of fusion. Lack of penetration. Inclusions. Porosity. The course includes hands-on workshops for metal welding using various techniques and microstuctural evaluation of the welds.

Educational Goals

Students are expected to
– acquire the knowledge of the fundamentals of welding and the different welding methods.
– understand the main principles of Metallurgy of welding and the effect of various welding parameters in the structure and properties of welds.
– to identify the discontinuities of welds and understand how to prevent and detect them.

General Skills

Research, analysis and synthesis of data and information, using corresponding technologies, Adaptation to new situations, Independent work, Teamwork – distribution of responsibilities, Intellectual competences, Societal competence

Teaching Methods

Lectures, Exercises, Online guidance, Projected Presentations, E-mail communication, Online Synchronous and Asynchronous Teaching Platform (moodle).

Students Evaluation

Assessment Language: English / Greek
The final grade of the course is formed by 70% by the grade of the theoretical part and by 30% by the grade of the laboratory part.
1. The grade of the theoretical part is formed by a written final examination.
The written final examination of the theoretical part may include:
Solving problems of application of the acquired knowledge, Short answer questions etc
2. The examination of the Laboratory Exercises is carried out with the continuous evaluation of the laboratory skills and the theoretical knowledge that were acquired in the course by the method of continuous evaluation and submission of weekly assignments

Recommended Bibliography

Principles of welding: Processes, Physics, Chemistry, and Metallurgy, MESSLER R. W., 2004, Wiley-VCH.
Welding processes handbook, Weman K., 2012, second edition, Woodhead Publishing