- •Затверджено Методичною радою нтуу “кпі”
- •Module 1 text a
- •1. Learn the following words and word combinations:
- •9. Put the questions to the underlined words.
- •10. Communicative situations:
- •11. Summarize and retell the text. Text b welding: introduction
- •1. Learn the new words and word combinations:
- •2. Read and translate the text.
- •3. Answer the following questions:
- •4. Are the following statements about the text true or false? Why?
- •5. Complete the following sentences:
- •6. Find in the text the English equivalents of the following word combinations.
- •7. Chose the correct definition to the word:
- •8. Fill in the gaps with proper prepositions.
- •9. Put the questions to the underline words or word combinations.
- •10. Communicative situations:
- •11. Make up a summary of the text and use it to retell the text. Text c bending, projection, shearing, staking
- •Exercises
- •1. Learn the following words and word combinations:
- •2. Read and translate the text.
- •3. Answer the following questions:
- •4. Translate from Ukrainian into English.
- •5. Combine the following words to get proper terms:
- •6. Make the nouns from the verbs:
- •7. Put the verbs in brackets in the correct form.
- •8. Fill in the gaps with the proper prepositions.
- •9. Complete the following sentences:
- •Self-assessment module 1
- •4. Give the English equivalents of the words:
- •6. Choose the topic and prepare your mini-presentation:
- •Module 2 text a systems of automatic control of arc welding
- •Exercises
- •1. Learn the following words and word-combinations:
- •2. Read and translate the text.
- •3. Answer the following questions:
- •4. Are the following statements about the text true or false? Why?
- •5. Complete the following sentences choosing the right word in brackets.
- •6. Put the following words in the correct order.
- •7. Put questions to the following answers:
- •8. Find the English equivalents of the following words:
- •9. Find in the text the sentences with Passive Voice.
- •10. Retell the text. Text b electro-slag welding
- •Exercises
- •1. Learn the new words and word combinations:
- •Text c ultrasonic welding
- •Exercises
- •6. Put all possible questions to the following sentences:
- •Self-assessment module 2
- •2.Give the Ukrainian equivalents of the following words and word-combinations:
- •3. Are the following statements true or false?
- •4. Give the definitions to the following words:
- •5. Make up your own sentences using the following words and word combinations:
- •6. Choose the topic and prepare your mini-presentation:
- •Module 3 text a friction stir welding (fsw) of aluminium alloys
- •Exercises
- •1. Learn new words and word combinations:
- •10. Complete the questions on the text.
- •11. Communicative situations:
- •12. Retell the text. Text b plasma
- •Exercises
- •5. Continue the following sentences:
- •6. Fill in the gaps using the following words and word-combinations:
- •7. Find in the text the sentences with Passive Voice.
- •8. Make 10 questions to the text.
- •9. Choose the correct verb form in the following sentences:
- •10. Retell the text. Text c laser welding
- •Exercises
- •1. Learn the following words and word combinations:
- •2. Read and translate the text.
- •3. Answer the following questions:
- •4. Decide, whether the statements below are true or false. Why?
- •5. Put all possible questions to the sentences.
- •6. Choose the correct definition to the word:
- •7. Fill in the gaps with a proper article.
- •Self-assessment module 3
- •2. Make the verbs from the nouns:
- •3. Give the definitions to the following words:
- •4. Are the following statements true or false?
- •5. Give the Ukrainian equivalents of the words:
- •6. Choose the topic and prepare your mini-presentation:
- •Module 4 text a some aspects of corrosion of high-alloy steel
- •Exercises
- •1. Learn the following words and word-combinations:
- •2. Read and translate the text.
- •3. Answer the following questions:
- •4. Are the following statements about the text true of false? Why?
- •5. Fill in the gaps using the following words and word-combinations:
- •6. Put all possible questions to the following sentences:
- •7. Complete the following sentences from the text:
- •8. Put the following verbs in the correct form.
- •9. Find in the text the sentences with the modal verbs. Explain them.
- •10. Put ten questions to the text.
- •11. Retell the text. Text b electric welding of soft tissues in surgery
- •Exercises
- •1. Learn the following words and word combinations:
- •2. Read and translate the text.
- •3. Answer the following questions:
- •4. Combine the following words to receive proper terms:
- •5. Insert the following preposition (in-5,with-2, on-1, by-2, of-4, for-2).
- •6. Give three forms of comparison of the following adjectives:
- •7. Translate from Ukrainian into English.
- •8. Put the verbs in brackets in a proper form.
- •9. Complete the questions on the text.
- •10. Communicative situations:
- •11. Retell the text. Text c thermit welding
- •Exercises
- •1. Learn the following words and word-combinations:
- •2. Read and translate the text.
- •3. Answer the following questions:
- •4. Are the following statements about the text true or false? Why?
- •5. Fill in the gaps using the following words and word-combinations:
- •6. Translate into Ukrainian paying attention to the Participles.
- •Self-assessment module 4
- •2. Give the English equivalents of the following words and word-combinations:
- •3. Are the following statements true or false?
- •4. Read the text. Comment on the advantages and disadvantages of the floating welded mega-structures.
- •5. Choose the topic and prepare your mini-presentation:
- •Appendix
- •2. English proverbs and sayings.
- •Content
5. Continue the following sentences:
Plasma welding allows avoidance of …
The usage of this welding method leads to…
Modern electronics allows…
Plasma surfacing gains wide acceptance in …
6. Fill in the gaps using the following words and word-combinations:
Constriction, straight polarity, reverse polarity, straight polarity, single pass, dilution, penetration, single pass.
The … … plasma arc can weld copper up to 50 mm. thick in a … … .
The important property of microplasma welding is a high degree of … of the arc.
Plasma surfacing can be performed at a direct current of … or … polarity.
Owing to minimum … of the base metal and its minimum … with the deposited metal the plasma surfacing provides the preset properties in the first of the deposited layers.
Plasma arc can weld copper up to 50 mm. thick in a … … without groove preparation.
7. Find in the text the sentences with Passive Voice.
8. Make 10 questions to the text.
9. Choose the correct verb form in the following sentences:
Plasma welding (provides, has provided) the highest effect when used for joining metals.
Plasma welding (allows, allowed) avoidance of preheating.
The important property of plasma welding (is, are) a high degree of constriction of the arc.
Plasma surfacing (can be performed, can perform) at a direct current or reverse or straight polarity.
Plasma surfacing (gains, has been gained) wide acceptance.
10. Retell the text. Text c laser welding
Today there are numerous welding techniques other than gas welding and arc welding for every special field, because different materials call for different techniques. There are numerous techniques just for welding metals. Laser welding is the future for welding metal.
Other conventional welding techniques like, for example, TIG(tungsten inert gas welding), MAG(metal active gas welding), or plasma welding do not reach the energy densities needed for a deep welding effect.
The principle of laser welding is to create laser radiation and with it the energy, that is necessary for the welding process. This energy is lead by a deflection mirror and a focusing device, e.g. focusing mirror, to where it should have it’s effect, to the joint of the work pieces.
The work pieces themselves are positioned and fixed in such a way in the work piece seat, that the focused laser beam can be diverted exactly on the additional seam. The laser welding head moves along the joint over the work piece. The enormous energy density of the laser beam in focus makes the material melt and vaporize
The pressure of dissipating metal vapor can become so high, that a vapor channel forms in the material – the so-called “ keyhole”. This “keyhole” penetrates a few millimeters deep into the material.
When the laser welding head moves over the work piece, the keyhole moves with it under the laser welding head. The two casts flow into one another behind it. The joined and mixed material cools off and the cast solidifies to a narrow welding seam.
The welding seam is usually protected from reaction with the air by a shield gas during the machining. Other gases, the work gases, can aid and control welding process. When welding with a laser, two different welding techniques are used: heat conduction welding and deep welding. When using heat conduction welding, the material is melted only on the surface. In this way, welding seams a few tenths of a millimeter deep are formed. This welding technique is useful with pulsed laser, which is used for welding components for the electronic industry or for medical small parts. When producing, for example, gear parts, profiles or thick walled tubes, very deep and narrow welding seams are required. In these cases, deep welding is done with the CO2 laser.
In industrial practice laser welding is used mainly for joining coated materials, sheet stacks and components of different sizes where distortion at risk.
With steels, the weldability of the workpiece depends in the first place on the amount of carbon in it. Chrome nickel steels are generally easy to weld and permit high welding speeds because of their low heat conductivity. Non – ferrous metals are generally poorer to weld as steel. The reason for this is that these alloys have a lower degree of absorption for the laser radiation than in the case with steels.
Titanium and titanium alloys are easy to weld with the laser. A feature, though, make the welding process difficult – they react heavily to principle components in the air: oxygen and nitrogen. Here both by welding and by cooling down, the welding seam must be selectively work on with shield gas or even in a shield gas atmosphere.
If you compare laser welding with tungsten inert gas welding, metal active gas welding or plasma welding, the great advantage of laser welding can be seen in the possibility of deep welding. With other techniques, it is not possible to achieve the required energy density for a deep welding effect.