Mechanical Technology II

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In the theoretical classes, each process is explained. In the laboratory component there will be made presentations of pratical content and generic works are carried out, leading students to a real contact with this technology.

Acquire knowledge that allows selecting and parameterizing welding processes. generic: Ability to analyze and synthesize, ability to apply knowledge in practice, ability to organize and plan welding work, knowledge of the area of study, research capacity, ability to act in new situations, creative ability, ability to identify , outline and solve problems. Specific competences: They must know how to choose the processes, they must know how to identify the problems that usually arise in this area. They must know how to analyze the cost of welding processes. To master the phenomena that exist in the electric arc, to know the phenomenon of solidification, to know the concrete phenomena of metallurgy. Know industrial gases in general. Interact with multidisciplinary groups and provide comprehensive solutions with a view to an appropriate welding operation.

1. Introduction to welding technology

Definition of the process. Evolution of technological welding processes. Fusion welds. Solid state welding. Definition of weldability and what factors affect it.

2. Terminology and Symbology

Definition of joint and chamfer. Welding positions. Process for opening chamfers. Quotation of welded joints.

3. Electric arc physics

Definition of the electric arc and what are its characteristics. Electric arc curve. Curve of the welding machine. Types of metallic transfer. Types of energy sources.

4. Welding defects

Explanation of the main types of defects that arise in welding processes.

5. Welding by coated electrodes

Fundamentals of the process. Equipment and Consumables. Operative parameters. Industrial examples.

6. Mig / Mag welding with solid wires and flux wires

Fundamentals of the process. Equipment and Consumables. Operative parameters. Industrial examples.

7. Tig welding process

Fundamentals of the process. Equipment and Consumables. Operative parameters. Industrial examples.

8. Welding inspection tests

Explanation and demonstration of the main inspection methods for weld beads (X-rays, penetrating liquids, magnetoscopy and ultrasound).

9. Thermal cut

Explanation of the different types of thermal break. Advantages and disadvantages.

10. Other types of welding

Plasma welding, Submerged Arc welding, Friction welding, Oxigas welding, Resistance welding, Laser welding and explosion welding.

NAO

Recommended Bibliography:

• Koch, H. (1965). Manual de la tecnologia de la soldadura eléctrica por arco. Reverté, Barcelona [disponível na biblioteca do ISEC em 4-2-36]
• Little, R. (1973). Welding and welding technology. McGraw-Hill 
• Santos, J. Quintino, L. (1998). Processos de soldadura. (2ª ed.). Instituto de Soldadura e Qualidade  [disponível na biblioteca do ISEC em 4-2-55 e 4-2-56]
• Richard, K. (1976).  Joint preparations for fusion welding of steel. The welding Institute  [disponível na biblioteca do ISEC em 4-2-32]
• Silva, F. (2017). Tecnologia da Soldadura – Uma abordagem técnico-didática (2ª edição). Publindustria