Welding Theory and Technology (FSI-HS2)

Academic year 2022/2023
Supervisor: Ing. Marian Sigmund, Ph.D., IWE  
Supervising institute: ÚST all courses guaranted by this institute
Teaching language: Czech
Aims of the course unit:
The main objective of the course is to provide students with the theoretical foundations and methodology necessary for solving welding and weldability of metals. It prepares students to apply the acquired knowledge when doing class and diploma projects, and for further studies.
Learning outcomes and competences:
The subject Welding Theory and Technology provides students with basic information describing the structure,properties and defects of welding joints, HAZ and about related conventional and non-conventional welding processes.
Prerequisites:
1. Fe – Fe3C equilibrium diagram, 2. TTT and thermo-kinetic diagrams, 3. Testing of mechanical properties of metals, 4. Heat treatment of steels. 5 . Basic knowlage welding methods.
Course contents:
The course deals with the following topics: Theoretical conditions of the production and existence of a welding joint with respect to welding materials, energetic sources, physical-chemical and metallurgical processes taking place by metallic materials welding. Degradation processes of welding material by thermal deformation cycle. Stress and deformation in welding. Weldability of metallic materials. Principles and theories of individual welding methods and thermal cutting. Brazing of materials. Thermal spraying. Destructive and non-dstructive testing of welds.
Teaching methods and criteria:
The course is taught through lectures explaining the basic principles and theory of the discipline. Teaching is suplemented by practical laboratory work.
Assesment methods and criteria linked to learning outcomes:
The course is finalized with the course-unit credit.
The final exam will be composed of written and oral part.
It is classificated to the ECTS grading scale.
Controlled participation in lessons:
Attendance in lectures is recommended.
Attendance in exercises is compulsory.
The attendance to the seminar is regularly checked and the participation in the lesson is recorded.
Type of course unit:
    Lecture  13 × 3 hrs. optionally                  
    Laboratory exercise  13 × 3 hrs. compulsory                  
Course curriculum:
    Lecture

1. Theoretical principles of forming a welding joint, terminology in welding. Physical bases of fusion welding processes. Heat power resources for welding.
2. Extending of heat in a welding joint. Temperature – deformation cycle and temperature calculations. Tension and deformation in welding joints.
3. Macrostructure and microstructure of welding joint and heat effected zone (HAZ). Structure and properties of fusion metal and HAZ.
4. Theory of weldability.
5. Weldability of metallic materials. Weldability of carbon and carbon – manganese steels.
6. Weldability of microdoped, low and high strength steels
7. Weldability of high alloy steels (corrosion resistant).
8. Weldability testing, disposition to cracking
9. Welding of aluminium, copper, titanium and their alloys
10. Welding of graphitic irons.
11. Principles and processes of heat and non-heat cutting.
12. Brazing and soldering. Adhesive bonding. Thermal spraying.
13. Descructive (DT) and Non-descructive (NDT) testing of welds.
    Laboratory exercise 1.Classification of welding methods in ČSN EN and their basic principles.
2.Application of equilibrium diagrams and their applications in welding
3.Construction of a thermal cycle
4.Influence of hydrogen in weldability
5.Calculation of tensions and deformations
6.Weldability of C - Mn and microdopped steels
7.Application of ČSN EN 1011-2 standard
8.Weldability of high alloy steels
9.Defects in welding joints
10.Power welding sources
11.Calculations in welding of electron beam and laser
12.Powered properties of covered electrodes
13.Credit
Literature - fundamental:
1. AMBROŽ, Oldřich. Technologie svařování a zařízení: učební texty pro kurzy svářečských inženýrů a technologů. Ostrava: ZEROSS, 2001. ISBN 80-85771-81-0
2. BARTÁK, Jiří. Výroba a aplikované inženýrství ve svařování: učební texty pro kurzy svářečských inženýrů a technologů. Ostrava: ZEROSS, 2000. ISBN 80-85771-72-1.
3. FOLDYNA, Václav. Materiály a jejich svařitelnost: učební texty pro kurzy svářečských inženýrů a technologů. 2., upr. vyd. Ostrava: ZEROSS, 2001. ISBN 80-85771-85-3.
4. MAJER, Lubomír. Navrhování a posuzování svařovaných konstrukcí a tlakových zařízení: učební texty pro kurzy svářečských inženýrů a technologů. Ostrava: ZEROSS, 1999. ISBN 80-85771-70-5.
Literature - recommended:
1. Žák,J. Novák,M.: Teorie svařování, , 0
2. Hrivňák,Ivan: Teoria zvárania ko.mat., , 0
3. Séférian,D.: Nauka o kov.ve sv.oceli, , 0
4. ASM Handbook. Welding,Brazing and Soldering. Vol. 6. USA: ASM,2003. 1298 s. ISBN 0-87170-382-3
The study programmes with the given course:
Programme Study form Branch Spec. Final classification   Course-unit credits     Obligation     Level     Year     Semester  
CŽV full-time study CZV Bases of Mechanical Engineering -- Cr,Ex 5 Compulsory-optional 1 1 W
N-SLE-P full-time study --- no specialisation -- Cr,Ex 5 Compulsory 2 1 W
N-STG-P full-time study STG Manufacturing Technology -- Cr,Ex 5 Compulsory-optional 2 1 W