PRIFYSGOL CYMRU ABERTAWE

PRIFYSGOL ABERTAWE

SWANSEA UNIVERSITY School of Engineering

SEMESTER 2 EXAMINATIONS

JUNE 2008EG-284Manufacturing Technology IILEVEL 2

UNIVERSITY CALCULATORS ONLY Translation dictionaries are not permitted, but an English dictionary may be borrowed from the invigilator on request.

Time allowed:

2 hours

Answer THREE questionsPlease insert any standard constants here.

Turn Over

1. The photograph below shows a typical cross section through a spot weld joining two thin plates.

a) Which techniques would permit you to carry out non-destructive testing to determine the integrity and quality of the weld?[10 marks]

b) The figures below show a typical steel weldment cross-section. Which techniques would permit you to carry out non-destructive testing to determine the integrity and quality of this type of weld?

[10 marks]

c) You have been asked to carry out an NDT investigation of a large grey cast iron component using ultrasound. What difficulties can you foresee?

[5 marks]

2. Many engineering products require different materials to be joined together. Such joints may be permanent or capable of being undone.

a) Briefly describe, with the aid of suitable diagrams, the three basic types of joining.

[15 marks]

b) In the case of fusion welding, what are the main factors that control the inherent strength of the joint and how can small flaws in the joint affect mechanical properties?

[10 marks]

Turn Over

3. Describe wire cutting Electric discharge machining.

[18 marks]

What unique feature of the machining process make it particularly suited to the manufacture of compacting dies, extrusion dies and turbine blades?

[7 marks]

4. What is glow discharge?

[6 marks]

Describe the process of plasma nitriding using a glow discharge. What are its advantages and disadvantages?

[16 marks]

What advantage does this form of surface treatment confer to a component?

[3 marks]

END OF PAPER

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