Контр 3, вар 4 (Resistance Welding)

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Контр 3, вар 4 (Resistance Welding)


Контрольная работа № 3
Вариант № 4
I. Перепишите сложные существительные, определите в них основное слово; переведите на русский язык.
a railway, a seaman, a postman, a classmate, a schoolboy, a shop-assistant

II. Образуйте причастие I от следующих глаголов, переведите словосочетания на русский язык
(to pass by) people - passing by people, a girl (to write on the blackboard), the sun (to rise), people (to gather), a (to paint) man, a (to work) crane

III. Употребите возвратные местоимения
1. He wants to build a house ... .
2. She cleaned the flat....
3. You will finish the work... .
4. Look at ... in the mirror.
5. We shall tell her everything ... .
6. Help ... !

IV. Образуйте от глаголов причастие II, переведите словосочетания на русский язык.
an (to establish) institution - an established institution, goods (to sell), parts (to machine), electrodes (to use), heal (to obtain), operations (to mechanize)

V. Переведите предложения, обращая внимание на видовременные формы страдательного залога.
1. Keys were lost yesterday.
2. The letter will be sent tomorrow.
3. Is she often asked?
4. Your question will be answered tomorrow.
5. I was offered an interesting job.
6. The dish is made with good taste.

VI. Перепишите предложения, обратите внимание на придаточные предложения; переведите их на русский язык.
1. Не goes out when the weather will get warmer.
2. If he had known the timetable he wouldn’t have missed the train.
3. It would be better if you learned to drive a car.
4. I would have sent a letter to you if I had known your address.
5. If I were you I wouldn’t buy tickets beforehand.
6. If I have spare time, we shall go to dance.

VII. Прочитайте текст, переведите его письменно и ответьте на вопросы после текста.
Resistance Welding
In resistance welding, heat is obtained fr om the resistance of metal to the flow of an electric current. Electrodes are clamped on each side of the parts to be welded, the parts are subjected to great pressure, and a heavy current is applied for a short period of time. The point wh ere the two metals touch creates resistance to the flow of current. This resistance causes heat, which melts the metals and creates the weld. Resistance welding is widely employed in many fields of sheet metal or wire manufacturing and is often used for welds made by automatic or semi-automatic machines especially in automobile industry.
Non-consumable Electrode Arc welding
As a non-consumable electrodes tungsten or carbon electrodes can be used. In gas-tungsten arc welding a tungsten electrode is used in place of the metal electrode used in shielded metal-arc welding. A chemically inert gas. such as argon, helium, or carbon dioxide is used to shield the metal from oxidation. The heat from the arc formed between the electrode and the metal melts the edges of the metal. Metal for the weld may be added by placing a bare wire in the arc or the point of the weld. This process can be used with nearly all metals and produces a high-quality weld. However, the rate of welding is considerably slower than in other process.
Shielded Metal Arc welding
In shielded metal-arc welding, a metallic electrode, which conducts electricity, is coated with flux and connected to a source of electric current. The metal to be welded is connected to the other end of the same source of current. Touching the tip of the electrode to the metal and then drawing it away forms an electric arc. 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.
Gas-Metal Arc welding
In gas-metal welding, a bare electrode is shielded from the air by surrounding it with argon or carbon dioxide gas and sometimes by coating the electrode with flux. The electrode is fed into the electric arc, and melts off in droplets that enter the liquid metal of the weld seam. This process can join most metals.
Submerged Arc welding
Submerged-arc welding is similar to gas-metal arc welding, but in this process no gas is used to shield the weld. Instead of that, the arc and tip of the wire are submerged beneath a layer of granular, fusible material that covers the weld seam. This process is also called electroslag welding. It is very efficient but can be used only with steels.

Wordlist
resistance welding    контактная сварка
gas-tungsten welding    сварка оплавлением вольфрамовым электродом
среде инертного газа
gas-metal arc welding    аргонодуговая сварка
carbon dioxide    углекислый газ
to submerge    погружать

Questions
1. What kinds of welding can be used for joining steels?
2. What is the difference between the arc welding jand non-consumable electrode arc welding?
3. How is electrode protected from the air in gas -metal arc welding?
4. What is submerged arc welding?
5. What is the principle of resistance welding?