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Рубрика:
56
электрод, свариваемые металлы, пересечение нулевого уровня, пленка
ПВХ, светофильтры, наплавка, горючие материалы
4 Say if the following statements are true or false. Correct the false
sentences.
1. Filler material is always necessary for arc welding.
2. The amount of heat input at the welding point depends on the voltage.
3. Shielded metal arc welding is a consumable electrode process.
4. Consumable welding processes use any type of current.
5. Consumable electrode methods are faster than none-consumable ones.
6. TIG welding requires little operator training.
7. Submerged arc welding is used to weld large work pieces.
5 Answer the following questions on the text.
1. What is arc welding?
2. What kind of current and electrodes are used in arc welding?
3. What is the welded region protected by?
4. Why is constant current power supply most often used for manual welding
processes?
5. How does the type of the electrode charge (positive/negative) influence the
speed of welding and weld penetration?
6. What problem is related to the use of alternating current in gas tungsten
welding?
7. What is the function of flux in shielded metal arc welding?
8. What are the main advantages and disadvantages of manual metal arc
welding?
9. Which type of metal arc welding uses a separate filler material?
10. What do the welding protection clothes include?
6 Match the terms (1-10) and their meanings (A-J).
1. Anode
A
Electromagnetic radiation with a wavelength shorter than
that of visible light, but longer than soft X-rays.
2. Ultraviolet
(UV) light
B
Difference of electrical potential between two points of
an electrical network, expressed in volts [1]. It is a measure
of the capacity of an electric field to cause an electric
current in an electrical conductor.
3. Flux
C
Electrical current whose magnitude and direction vary
cyclically, as opposed to direct current, whose direction
remains constant.
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