Read and translate the text.

3. Answer the following questions:

1. Is ultrasonic welding totally unlike the fusion and diffusion welding?

2. What advantages does ultrasonic welding have?

3. What equipment is used for ultrasonic welding?

4. How many controls may resistance welding machine have?

5. How does the ultrasonic-welding equipment differ from resistance units?

4. Are the following statements about the text true or false? Why?

1. Ultrasonic welding is totally like the fusion welding.

2. The substrate layers are affected in the process of ultrasonic welding.

3. The surface preparation is more exacting for ultrasonic welding.

4. The controls for ultrasonic welding are complex.

5. The power requirements for ultrasonic welding are more than for resistance welding.

5. Fill in the gaps using the following words and word-combinations:

power requirements, disturbance, sheet separation, disruption, cladding layers, fusion, deformation, diffusion, bond zone, metallurgical zone, substrate layer.

1. It should be emphasized that ultrasonic welding is unlike …, …, … welding processes.

2. The … is between the cladding layers.

3. There is no … at the edges of ….

4. In ultrasonic welding the … are unaffected.

5. Depending on the alloy, there may be … and … at the interfacial plane.

6. Put all possible questions to the following sentences:

1. A further advantage of ultrasonic welding is that surface preparation is less exacting.

2. The power requirements for ultrasonic welding of aluminium are substantially less than for resistance welding.

3. The expensive power installations are not required for ultrasonic welding equipment.

4. Ultrasonic welding is totally unlike the better-known fusion, diffusion and deformation welding processes.

Find in the text the sentences with the modal verbs, comment on the use of them.

8. Complete the following sentences from the text:

1. Ultrasonic welding is totally unlike …

2. The metallurgical bond is …

3. The power requirement for ultrasonic welding …

4. Expensive power installations …

Find the subordinate clauses in the text.

Retell the text.

SELF-ASSESSMENT

MODULE 2

1. Answer the following questions:

1. How many groups of systems for automatic control do you know?

2. What is the advantage of such systems?

3. When was the electro-slag welding founded?

4. What is electro-slag re-melting?

5. What were the 2 new applications developed in Paton Institute?

6. Are there any benefits of the ESW?

7. Is ultrasonic welding totally unlike the fusion and diffusion welding?

8. What advantages does ultrasonic welding have?

9. What equipment is used for ultrasonic welding?

10. How does the ultrasonic-welding equipment differ from resistance units?

2.Give the Ukrainian equivalents of the following words and word-combinations:

Disturbance, weld width, magnetic stirring, groove, blast furnace jacket, source of heat, leap, welding gap, billet, ingot, mould, new in essence, cross-section, plate, bond-zone, sheet separation, feasible, current conductive slag.

3. Are the following statements true or false?

1. The systems for automatic control can be divided into ten groups.

2. These systems are rather expensive.

3. The electric arc process of consumable electrode melting has successfully been used in welding practice for about 100 years.

4. Electro-slag welding is a very efficient, single pass process carried out in the vertical or near vertical position and used for joining steel plates or sections in thickness of 25 mm and above.

5. Ultrasonic welding is totally like the fusion welding.

6. The controls for ultrasonic welding are complex.

7. The controls for ultrasonic welding are complex.

4. Give the definitions to the following words:

Torch, alloy, appliance, helmet, casting, beam, welder, pipe, jet, heater.

5. Make up your own sentences using the following words and word combinations:

Electrode, influence, source, wire, rate, self-regulation, eliminate, process, consumable, solid, liquid, conductive, substrate layer, diffusion.

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

1. “The advantages of the systems of automatic control in welding.”

2. “The principal risks of ESW.”

3. “The equipment for ultrasonic welding.”

MODULE 3

TEXT A

Дата добавления: 2015-11-16