Ответьте письменно на вопросы

1) What does the term «computer» describe?

2) Is computer intelligent?

3) What are five components of computer system?

4) What is connectivity?

5) What is software? What's the difference between hardware and software?

6) Why people are the most important component of a computer system?

7) In what way terms «data» and «information» differ?

Закончите предложения.

1) The term computer is used to describe.....

2) People are the most important.....

3) Computer is used to convert.....

4) Without software instructions.....

5) Com­puter has no intelligence.....

Welding

1) Welding is a process when metal parts are joined to­gether by the application of heat, pressure, or a combi­nation of both. The processed of welding can be divided into two main groups: pressure welding, when the weld is achieved by pressure and heat welding, when the weld is achieved by heat. Heat welding is the most common welding process used today.

2) Nowadays welding is used instead of bolting and riv­eting in the construction of many types of structures, including bridges, buildings, and ships. It is also a basic process in the manufacture of machinery and in the mo­tor and aircraft industries. It is necessary almost in all productions where metals are used.

3) The welding process depends greatly on the proper­ties of the metals, the purpose of their application and the available equipment. Welding processes are clas­sified according to the sources of heat and pressure used.

4) The welding processes widely employed today include gas welding, arc welding, and resistance welding. Other joining processes are laser welding, and electron-beam welding.

Gas Welding

5) 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.

6) 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.

7) 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.

8) 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 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.

Дополнительныйсловарь:

pressure welding — сварка давлением

heat welding — сварка нагреванием

bolting— скрепление болтами

riveting— клепка

gas welding — газосварка

arc welding — электродуговая сварка

filler— наполнитель

flux— флюс

to shield— заслонять, защищать

touching— касание

tip [tip] — кончик

1. Перепишите и переведите абзацы2), 3), 4).
2. Ответьте письменно на вопросы.

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 is the difference between the arc welding and shielded-metal welding?