Translate the text into Ukrainian language.
Answer the question
1. When is soldering used?
2. What mechanical strength do they have?
3. How may metals be soldered?
4. Metals may be dipped in molten solder, may not they?
5. What should the selection of brazing method be based on ?
Match the sides
| 1. Liquid tights are required | 1. міцність на розрив |
| 2. Tensile strength | 2. паяльник |
| 3. Soldered seam | 3. потрібні міцні рідкі з'єднання |
| 4. Soldering iron | 4. можуть бути занурені в рідкий припій |
| 5. May be dipped into molten solder | 5. паяний шов |
Make up the sentences
1. Soldering, is, joint, a, tight, liquid.
2. Have, they, strenght, mechanical, low.
3. use, they, automatic, equipment.
4. has, brazing, strength, a, high, tensile.
5. You, use, may, iron, soldering .
Choose the right variant
1. We (not/have) a holiday last year
a) didn’t have
b) haven’t had
c) hadn’t have
2. My parents (be) to the USA many times
a) have been
b) were
c) have being
3. … it (shop) raining yet?
a) did it shop
b) is it shopped
c) has it shopped
4. One of the passengers (die) in that accident.
a) has died
b) died
7. Retell the Text "Soldering".
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Премущества соединения пайкой
"Advantages of soldering"
Read The Text .
2. Write down the unknown words. Find the translation in the dictionary.
| The Text: | Unknown words: | Translation: | |||
| Soldering is a process in which two or more metal items are joined together by melting and flowing a filler metal (solder) into the joint, the filler metal having a lower melting point than the workpiece. Soldering differs from welding in that soldering does not involve melting the work pieces. There are three forms of soldering, each requiring higher temperatures and each producing an increasingly stronger joint strength: 1. soft soldering, which originally used a tin-lead alloy as the filler metal, 2. silver soldering, which uses an alloy containing silver, 3. brazing which uses a brass alloy for the filler. The alloy of the filler metal for each type of soldering can be adjusted to modify the melting temperature of the filler. Soldering appears to be a hot glue process, but it differs from gluing significantly in that the filler metals alloy with the workpiece at the junction to form a gas- and liquid-tight bond.
Soft soldering is characterized by having a melting point of the filler metal below approximately 400 °C (752 °F), whereas silver soldering and brazing use higher temperatures, typically requiring a flame or carbon arc torch to achieve the melting of the filler. Soft solder filler metals are typically alloys (often containing lead) that have liquidus temperatures below 350°C. In the soldering process, heat is applied to the parts to be joined, causing the solder to melt and to bond to the workpieces in an alloying process called wetting. In stranded wire, the solder is drawn up into the wire by capillary action in a process called 'wicking'. Capillary action also takes place when the workpieces are very close together or touching. The joint strength is dependent on the filler metal used, where soft solder is the weakest and the brass alloy used for brazing is the strongest. Soldering, which uses metal to join metal in a molecular bond has electrical conductivity and is water- and gas-tight. There is evidence that soldering was employed up to 5000 years ago in Mesopotamia. | |||||
3. Read and translate the following Text:
Soldering
1. Soldering is the process of making a sound electrical and mechanical joint between metals by joining them with a soft solder. 2. You may use a low temperature melting point. 3. This joint is heated to the correct. 4. Solder melts at around 190 degrees сentigrade. 5. The bit reaches a temperature of over 250 degrees сentigrade. 6. The advantage of a high voltage iron is that heat can flow quickly into a joint. 7. It can be rapidly made. 8. A smaller iron would take a longer time to heat the joint up to the correct temperature. 9. A small iron is used to make joints with small electronic components. 10. They are easily damaged by excess heat.
To translate the following text.
Answer the questions.
Questions:
1. What process is soldering?
2. How is soldering made?
3. What temperature melting point may we use?
4. What is the advantage of a high voltage iron?
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5. When is a small iron used?
Match the sides .
| 1. Melting point | 1. паяльне залізо |
| 2. Soldering iron | 2. низька температура |
| 3. Low temperature | 3. механічне з'єднання |
| 4. Mechanical joint | 4. легко ушкоджується |
| 5. Easily damaged | 5. точка плавління |
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Типы сварки
" TYPES of WELDING "
(типы сварки)
1. Read the text:
Types of welding
1. The processes of welding can be divided into some groups. 2. Pressure welding is achieved by pressure. 3. Heat welding is achieved by heat. 4. Heat welding is the most common welding process. 5. Welding is used in many fields of human activity. 6. The welding process depends greatly on the properties of the metals, the purpose of their application and the available equipment. 7. Welding processes are classified according to the sources of heat and pressure. 8. The welded surfaces must be clean. 9. The dirt will weaken the weld. 10. The high temperature causes oxidation.
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