Fill in the gaps with a proper article.

1... principle of laser welding is to create laser radiation and with it..... energy, that is necessary for.... welding process.

2. This energy is lead by.... deflection mirror or.... focusing device, to where it should have its effect, to.... joint of..... work pieces.

3...... pressure of.... dissipating metal vapor can become so high, that.... vapor channel forms in....material.

4.....welding seam is usually protected from reaction with.... air by.... shield gas during..... machining.

8. Complete the following sentences:

1..................just for welding metals.

2. The principle of laser welding is.....

3. The pressure of dissipating metal vapor can become so high that.......

4. When the laser welding head moves over the workpiece.........

5. When welding with a laser.........

9. Give the three forms of the following verbs:

To call, to be, to reach, to have, to fix, to make, to become, to penetrate, to protect, to mix.

10. Communicative situations:

1. Make up a dialogue on the topic “Principle of laser welding”

2. Discuss the advantages of laser welding over other conventional welding techniques with your fellow students.

Retell the text.

SELF-ASSESSMENT

MODULE 3

1. Answer the following questions:

1. What is Friction Stir Welding?

2. When was the FSW technique developed?

3. At what stage is the knowledge of friction stir welds?

4. What metals is plasma welding used for?

5. What machines for plasma welding are available?

6. What are the important properties of plasma welding?

7. What can surfacing be used for?

8. What is the principle of laser welding?

9. What creates the energy in laser welding process?

10. What are the two laser welding techniques?

2. Make the verbs from the nouns:

Alloy, application, weld, building, action, introduction, conversion, conductivity, avoidance, performance, preparation, inclusion, protection, control, requirement, practice, absorption, achievement.

3. Give the definitions to the following words:

Shipbuilding, friction, tungsten, welding, vapor, seam, mixture.

4. Are the following statements true or false?

1. There is no question that the usage of aluminium is increasing within the welding fabrication industry.

2. There is a great number of design data and understanding of the failure mechanisms of FSW.

3. What metals is plasma welding used for?

4. What machines for plasma welding are available?

5. What does the modern electronics allow?

6. What materials can be used as the coating ones?

7. What is the principle of laser welding?

8. What conventional welding techniques do you know?

9. In what way are the work pieces positioned?

10. What are the two laser welding techniques?

5. Give the Ukrainian equivalents of the words:

Brewing industry, toughness, feedability, porosity, layout, vendibility, constriction, reverse polarity, straight polarity, conventional, density, deflection, to dissipate, to penetrate, TIG, MAG, density.

6. Choose the topic and prepare your mini-presentation:

1. “Aluminium alloys in welding.”

2. “The principles of plasma surfacing.”

3. “Different kinds of laser welding.”

MODULE 4

TEXT A

Дата добавления: 2015-11-16