Завдання 3 Знайдіть синоніми , антоніми до наступних слів у тексті

A) 1. toughness B) 1. liquids

2. to remind 2. to separate.

3. to oppose 3. impossibility

4. stream 4. the lightest

5. size 5. passivity

Завдання 4. Виберіть, які речення відповідають змісту тексту.

1. Metals resemble one another in their general chemical behavior, but they differ greatly in activity.

2. The heaviest is osmium which is closely related to iron in physical and chemical properties.

3. Metals are also vary in hardness from potassium which can be molded like wax, to chromium, which will cut glass.

4. All substances offer more or less resistance to the flow of an electric current through them.

5. The solids obtained when two or more metals are mixed in the molted condition and allowed to solidify are called components.

Завдання 5. Складіть речення із поданих слів.

1. the, is, lithium, has, density, lightest, which, the, of, 0,534

2. the, platinum, is, heaviest, osmium, is, related, closely, to, which.

3. Constituted, of, an, each, alloy, a, called, component, is

4. The, greatly, ability, differs, of, alloys, to, form, various, metals

5. iron, lead, tin, silver, known, as, are, metals, heavy.

Навчальні тексти для студентів дистанційного курсу англійської мови.

Курс 4 семестр

Донецьк: 7010104010 Професійне навчання. Технологія та обладнання зварювального виробництва.

UNIT 1

Gas Welding and Arc Welding

Gas welding is a non-pressure process using heat from a gas flame. The flame is applied directly to the metal edges to be joined and simultaneously to a filler metal in the form of wire or rod, called the welding rod, which is melted to the joint. Gas welding has the advantage of using equipment that is portable and does not require an electric power source. The surfaces to be welded and the welding rod are coated with flux, a fusible material that shields the material from air, which would result in a defective weld.

Arc Welding

Arc-welding is the most important welding process for joining steels. It requires a continuous supply of either direct or alternating electrical current. This current is used to create an electric arc, which generates enough heat to melt metal and create a weld.

Arc welding has several advantages over other weld­ing methods. Arc welding is faster because the concen­tration of heat is high. Also, fluxes are not necessary in certain methods of arc welding. The most widely used arc-welding processes are shielded metal arc, gas-tungsten arc, gas-metal arc, and submerged arc.

Shielded Metal Arc

In shielded metal-arc welding, a metallic electrode, which conducts electricity, is coated with flux arid con­nected to a source of electric current. The metal to be welded is connected to the other end of the same source of current. An electric arc is formed by touching the tip of the electrode to the metal and then drawing it away.

The intense heat of the arc melts both parts to be welded and the point of the metal electrode, which supplies filler metal for the weld.

This process is used mainly for weld­ing steels.

Vocabulary notes:

1. gas welding – газове зварювання

2. arc welding – електродугове зварювання

3. resistance welding – контактне зварювання

4. laser welding – лазерне зварювання

5. electron-beam welding – електронно променеве зварювання

6. flame – полум'я

7. edge - край

8. simultaneously - одночасне

9. filler - наповнювач

10. wire - дріт

11. rod – стрижень

12. to melt- плавити

13. joint – з'єднання

14. advantage - перевага

15. to require – вимагати

16. surface - поверхня

17. flux -флюс

18. fusible - плавкий

19. to shield – захищати

20. touching - дотик

21. tip – кінчик

Завдання № 1: Дайте відповіді на запитання.

1. Give the definition of gas welding.

2. What kinds of welding can be used for joining steels?

3. What does arc welding require?

4. Is an electric arc formed by touching the tip of the electrode to the metal?

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