• Shipbuilding, Semester 2, position 5
• Rail Vehicles, Semester 2, position 5
• Zavarivanje i zavarene konstrukcije, Semester 2, position 5

The aim of this course is for students to become competent in the area of quality assurance and quality control of welded joints and welded structures. They should also develop appropriate academic skills and creativity and master practical skills needed for the profession. This course is designed to provide information through theoretical lectures but also through laboratory type (practical) exercises, computational classes and seminar papers students are responsible for writing.

After fulfilling all the course requirements, as prescribed by the course plan, the student is capable of applying the acquired knowledge to: • Explain the importance of quality assurance (QA) and quality management (QM) of weldеd structures. • Describes and to distinguish between different types of welded joint defects/imperfections/cracks. • Defines possible causes for certain types of welded joint defects/imperfection/cracks. • Defines the quality control plan for welding joints and weldеd structures. • Apply quality control plan, QA and QM in the case of different welded structures. • Defines specification and qualification of welding procedures for metallic materials. • Connect the acquired knowledge in this field with other areas and applies them in practice.

The concept and importance of the quality of welded construction. Quality assurance (QA) and quality management (QM) of welding construction. Quality requirements for fusion welding of metallic materials. Welded joint defects/imperfection. Causes of defects. Clasification of defects and analysis of different types of defects. Fusion welding and allied processes - classification of geometric imperfections in metallic materials. Typical forms and causes of certain types of welded joint defect. Quality assurance and inspection of welds and welded construction. Welding coordination - tasks and responsibilities. Welding quality control plan. Qualification test of welders - fusion welding. The procedure for design of welded construction. Specification and qualification of welding procedures for metallic materials. Weld cracking, classification, main causes. The methodological approach to the analysis of weld cracking. Hot Cracks. Cold cracks. Lamellar tearing. Weld post weld heat treatment cracks. Fusion welding – quality level for imperfection. Levels of quality assurance. Nondestructive Evaluation of welded joint and quality control.

Recapitulation - welded joints basic types, elements, forms of and marking. Clasification of welded joint defects. Practical examples of welded joint defects. Analysis of macro and microstructure of welded joints. Preparation of Welder qualificitaion certificate. Preparation of welding procedure specification (WPS). Preparation of welding procedure qualification record (WPQR). Fusion welding – quality level for imperfection (practical exercises). Exercises in welding shop – welded joint defects analysis. Characterization of welded joints. Fusion welding - quality level for imperfection. Assessment of imperfections. Acceptance criteria for welds and examination methods for evaluating weld. Influence of welding shape defects, lack of fusion and other defects onto appearance of damage of welded joints. Office hours.

Necessary conditions for a student to attend this course are: attended course lectures and finished exercises of Engineering materials 2.

1. Engineering materials 1 (in Serbian), R.P. Cvetkovic, O. Popovic, University of Belgrade, Mechanical Faculty, Belgrade, 2012, ISBN: 978-86-7083-774-4 2. Engineering materials 2 (in Serbian), Radica Prokić Cvetković, Olivera Popović, Gordana Bakić, Miloš Đukić, University of Belgrade, Faculty of Mechanical Engineering, Belgrade, 2021, ISBN: 978-86-6060-087-7 3. Welding procedures (in Serbian), O. Popović, R.P. Cvetković, University of Belgrade, Faculty of Mechanical Engineering, Belgrade, 2016, ISBN: 978-86-7083-909-0 4. Basic mechanisms of mechanical structures damages (in Serbian), Gordana Bakić, Miloš Đukić, Vera Šijački Žeravčić, University of Belgrade, Faculty of Mechanical Engineering, Belgrade, 2021, ISBN: 978-86-6060-069-3

Total assigned hours: 75

New material: 30
Elaboration and examples (recapitulation): 0

Auditory exercises: 0
Laboratory exercises: 8
Calculation tasks: 7
Seminar paper: 10
Project: 0
Consultations: 0
Discussion/workshop: 5
Research study work: 0

Review and grading of calculation tasks: 1
Review and grading of lab reports: 1
Review and grading of seminar papers: 2
Review and grading of the project: 0
Test: 2
Test: 4
Final exam: 5

Activity during lectures: 5
Test/test: 35
Laboratory practice: 10
Calculation tasks: 5
Seminar paper: 15
Project: 0
Final exam: 30
Requirement for taking the exam (required number of points): 40

ASM Metals HandBook Volume 06 - Welding Brazing and Soldering v1, 1993; ASM Metals HandBook Volume 17 - Nondestructive Evaluation And Quality Control v3, 1998; ASM Metals HandBook Vol 08 - Mechanical Testing and Evaluation, 2000