Предмет: Биология, автор: getmangeorgij178

ПОМОГИТЕ ПОЖАЙЛУСТА!!!

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Автор ответа: dimamelnicuk26

Ответ:

симбіотрофів.я так думаю

getmangeorgij178: Не правильно

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Прочитайте текст, переведите его письменно и ответьте на вопросы после текста.
Welding
Welding is a process when metal parts are joined together by the application of heat, pressure or a combination of both. The process 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.

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Nowadays welding is used instead of bolting and riveting in the construction of many types of constructions, 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.
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: gas welding, arc welding, and resistance welding. Other joining processes are laser welding, and electron-beam welding.
Gas 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 doesn't require an electric power source. The surface to be welded and the welding rod are coated with flux, a fusible material that shields the material from air, which would resist 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 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.
Wordlist
pressure welding сварка давлением
arc welding электродуговая сварка
resistance welding контактная сварка
laser welding лазерная сварка
electron-beam welding электронно-лучевая сварка
to shield заслонять, защищать
bolting скрепление болтами
riveting клепка
Questions
1. What is welding? 2. What are the two main groups of welding? 3. Where is welding necessary? 4. What do the welding process of today include? 5. What are the principles of gas and arc welding?

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