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I. Text A: «Welding», Text В: «Other types of welding»

II. Famous People of Science and Technology: James Prescott Joule.

Text A: «WELDING»

Welding is a process when metal parts arejoined to­gether by the application of heat, pressure, or a combi­nation of both. The processes of welding can be divided into two main groups:

• pressure welding, when the weld isachieved by pressure and

• heat welding, when the weld is achieved by heat. Heat welding is the most common welding process used today.

Nowadays welding is usedinstead of bolting andriv­eting in the construction of many types of structures, including bridges, buildings, and ships. It is also abasicprocess in themanufacture of machinery and in the mo­tor and aircraft industries. It is necessary almost in all productions where metals are used.

The welding processdepends greatly on the proper­ties of the metals, thepurpose of their application and theavailable equipment. Welding processes are clas­sified according to thesources of heat and pressure used.

The welding processes widely employed today include gas welding, arc welding, and resistancewelding. Other joining processes arelaser welding, andelectron-beam welding.

Gas Welding

Gas welding is a non-pressure process using heat from a gasflame. The flame is applied directly to the metal edges to be joined andsimultaneously to a filler metalin the form ofwire or rod, called the welding rod, which ismelted to thejoint.Gas welding has theadvantage of using equipment that is portable and does notrequire an electric power source. Thesurfaces to be welded and the welding rod arecoated withflux, afusible 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 tocreate 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 areshielded metal arc, gas-tung­sten arc, gas-metal arc, andsubmerged arc.

Shielded Metal Arc

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. An electric arc is formed bytouching thetipof 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 suppliesfillermetal for the weld. This process is used mainly for weld­ing steels.

Vocabulary:


to join — соединять

pressure welding — сварка давлением

heat welding — сварка нагреванием

instead — вместо, взамен

bolting — скрепление болтами

riveting — клепка

basic — основной

to manufacture — изготовлять

to depend — зависеть от

purpose — цель

available — имеющийся в наличии

equipment — оборудование

source — источник

gas welding — газосварка

arc welding — электродуговая сварка

resistance welding — контактная сварка

laser welding — лазерная сварка

electron-beam welding — электронно-лучевая сварка

flame — пламя

edge— край

simultaneously — одновременно

filler — наполнитель

wire — проволока

rod — прут, стержень

to melt — плавить(ся)

joint — соединение, стык

advantage — преимущество

to require — требовать нуждаться

surface— поверхность

coated — покрытый

flux — флюс

fusible — плавкий

to shield — заслонять, защищать

touching — касание

tip — кончик


General understanding:

1. How can a process of welding be defined?

2. What are the two main groups of processes of welding?

3. How can we join metal parts together?

4. What is welding used for nowadays?

5. Where is welding necessary?

6. What do the welding processes of today include?

7. What are the principles of gas welding?

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

9. What does arc welding require? 10. What is the difference between the arc welding and shielded-metal welding?

Exercise 6.1. Find the following words and word combinations in the text:


1. сварка давлением

2. тепловая сварка

3. болтовое (клепаное) соединение

4. процесс сварки

5. зависеть от свойств металлов

6. имеющееся оборудование

7. сварочный электрод

8. плавкий материал

9. дефектный сварной шов

10. непрерывная подача электрического тока

11. электрическая дуга

12. источник электрического тока


Text В: «OTHER TYPES OF WELDING»

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 chemicallyinertgas, such as argon, helium, orcarbon dioxideis used to shield the metal from oxidation. The heat from the arc formed between the electrode and the metal melts theedges of the metal. Metal for the weld may be added by placing abare 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, therate of welding isconsiderably slower than in other processes.

Gas-Metal Arc

In gas-metal welding, a bare electrode is shielded from the air bysurrounding it with argon orcarbon dioxidegas and sometimes by coating the electrode with flux. The electrode isfed into the electric arc, and melts off in droplets that enter theliquid metal of the weld seam. Most metals can be joined by this process.

Submerged Arc

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 wireare sub­merged beneath a layer of granular, fusible material that covers theweld seam. This process is also called electroslag welding. It is very efficient but can be used only with steels.

Resistance Welding

In resistance welding, heat is obtained from the re­sistance of metal to the flow of an electric current. Elec­trodes areclamped 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 where 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 ofsheet metal or wire manufac­turing and is often used for welds made by automaticor semi-automatic machines especially in automobile industry.

Vocabulary


gas-tungsten — сварка оплавлением вольфрамовым электродом в среде инертного газа

inert — инертный

edge — край

bare — голый

rate — зд. скорость

gas-metal arc — аргонодуговая сварка

considerably — значительно, гораздо

surrounding — окружающий

carbon dioxide— углекислый газ

droplet — капелька

liquid — жидкость, жидкий

beneath — под, ниже, внизу

layer — слой

weld seam — сварной шов

resistance — сопротивление

clamp — зажим, зажимать

sheet— лист

fusible — плавкий

granular — плавкий

semi-automatic — полуавтомати­ческая

to create — создавать

to submerge— погружать


General understanding:

1. What is the difference between the arc-welding and non-consumable electrode arc welding?

2. What are the disadvantages of the 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?

6. Where is semi-automatic welding employed?

Exercise 6.2. Translate into English:


1. вольфрамовый электрод

2. инертный газ

3. окисление

4. высококачественный сварочный шов

5. скорость сварки

6. аргон, гелий, углекислый газ

7. жидкий металл

8. слой плавкого материала в виде гранул

9. листовой металл

10. полувтоматические сварочные станки


Exercise 6.3. Translate into Russian:

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

2. The heat from the arc melts the edges of the metal.

3. A bare electrode is shielded from the air by sur­rounding it with argon or carbon dioxide gas.

4. Submerged-arc welding is similar to gas-metal arc welding.

5. Electrodes are clamped on each side of the parts to be welded.

6. Resistance causes heat which melts the metals and creates the weld.

Последнее изменение этой страницы: 2016-06-09

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