Fill in the gaps with the proper prepositions.

1. The upper part... the press, the ram... the appropriately shaped punch descends and forms the v-shaped bend.

2. Bending usually refers... deformation about one axis.

3. Large and small presses are used... specialized applications.

4. This makes... a controlled angle... very little spring back.

5. This process is known... Resistance Projection Welding, RPW.

6. Shearing is a process... cutting sheet metal... size out...a larger stock such... roll stock.

7. Shears are used... the preliminary step... preparing stock... stamping processes.

8. Staking is a method... fastening... squeezing protrusion formed... one part inside a hole... the second part, and then deforming the protrusion.

9. Complete the following sentences:

1. The upper part of the press, the ram with the appropriately shaped punch..........

2. The amount of spring back depends on.........

3. The inner radius of the bend is........

4....... which can be minimized to less than 10% of the material thickness.

5...... is a variation of spot welding.

6...... can be welded using this process.

7. Projections are usually......

8..... by squeezing protrusion formed in one part inside a hole in the second part, and then deforming the protrusion.

10. Communicative situations:

1. Speak with you group mate on the topic “ The usage of bending, shearing, staking and projection”.

2. Make up a dialogue with the plant leading engineer about choosing the proper process for welding thick materials.

Summarize and retell the text.

SELF-ASSESSMENT

MODULE 1

1. Answer the following questions:

1. Where can welding trace its historic development to?

2. Who originated resistance welding?

3. Where does the friction welding have its applications?

4. What is welding in engineering?

5. What is gas welding?

6. What is flux?

7. What did the welding process best suit to?

8. What is bending?

9. What can be welded using the process of projection?

10. What does the shearing process produce?

2. Make the nouns from the verbs:

To invent, to credit, to estimate, to weld, to produce, to involve, to deform, to classify, to consider.

3. Are the following statements true or false?

1. Welding cannot trace its historic development back to ancient times.

2. Laser welding is one of the newest processes.

3. Welding, in engineering, is any process in which two or more pieces of metal are joined together by the application of heat, pressure, or a combination of both.

4. Forge welding is often used in modern manufacturing.

5. In gas-metal welding, a bare electrode is not shielded from the air by surrounding it with argon or carbon dioxide gas or by coating the electrode with flux.

6. In resistance welding, heat is obtained from the resistance of metal to the flow of an electric current.

7. Welders help build metal products from coffeepots to skyscraper

8. Welding is the only way of joining two or more pieces of metal to make them act as a single piece.

9. Bending is a flexible process by which many different shapes can be produced.

10. Low carbon steels, low alloy steels, stainless steels, as well as aluminum can be welded using this process.

4. Give the English equivalents of the words:

Круглий, походити, накопичувальні батареї, величезний, оцінювати, зварювання ковкою, низькотемпературна пайка, дугове зварювання під флюсом, полуавтоматичний, перфоратор, згинання, сила напруги, завчасний, рельєф.

5. Read the text. Make up your own dialogues using the following words and word combinations: to be employed, the use of welding, paper making and printing equipment, maintenance and repair, to be responsible for, oil extraction, mining of ores, smelting and refining plants.

Welding is the most economical and efficient way to join metals permanently. It is the only way of joining two or more pieces of metal to make them act as a single piece. Welding is vital to our economy. It is often said that over 50% of the gross national product of the U.S.A. is related to welding in one way or another. Welding ranks high among industrial processes and involves more sciences and variables than those involved in any other industrial process. There are many ways to make a weld and many different kinds of welds. Some processes cause sparks and others do not even require extra heat. Welding can be done anywhere – outdoors or indoors, under water and in outer space. Nearly everything we use in our daily life is welded or made by equipment that is welded. Welders help build metal products from coffeepots to skyscrapers.

They help build space vehicles and millions of other products ranging from oil drilling rigs to automobiles. In construction, welders are virtually rebuilding the world, extending subways, building bridges, and helping to improve the environment by building pollution control devices. The use of welding is practically unlimited. There is no lack of variety of the type of work that is done. Welders are employed in many industry groups. Machinery manufacturers are responsible for agricultural, construction, and mining machinery. They are also involved in bulldozers, cranes, material handling equipment, food-processing machinery, papermaking and printing equipment, textiles, and office machinery. The fabricated metal product compiles another group including manufacturers of pressure vessels, heat exchangers, tanks, sheet metal, prefabricated metal buildings and architectural and ornamental work. Transportation is divided into two major groups: manufacturers of transportation equipment except motor vehicles; and motor vehicles and equipment. The first includes shipbuilding, aircraft, spacecraft, and railroads. The second includes automobiles, trucks, buses, trailers, and associated equipment. A small group of welders belongs to the group of repair services. This includes maintenance and repair on automobiles or refers to the welding performed on industrial and electrical machinery to repair worn parts. The mining, oil extraction, and gas extraction industries form yet another group. A large portion of the work involves drilling and extracting oil and gas or mining of ores, stone, sand and gravel. Welders are also employed in the primary metals industries to include steel mills, iron and steel foundries, smelting and refining plants. Much of this work is maintenance and repair of facilities and equipment. Another group is the electrical and electronic equipment companies. Welding done by this group runs from work on electric generators, battery chargers, to household appliances.

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

1. “Welding is the most economical and efficient way of joining metals.”

2. “The historical development of welding.”

3. “The unlimited abilities of the use of welding.”

MODULE 2

TEXT A

Дата добавления: 2015-11-16