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Ex.6. Match words and their definitions:

2. 
   a) welding 1. the person, who joins pieces of metal by heating them b) rust 2. to change smth from a solid to liquid by means of heat c) to burn 3. joining pieces of metal by heating them e) to evaporate 4. a reddish-brown substance that is formed on the surface of iron f) to melt 5. to change into steam or gas and disappear g) welder 6. to destroy, damage or injure smth with fire or heat
   

Ex. 7 Find the ending of the sentences in the text:

1. 
   All types of welding require that the hot metal … .
   
2. 
   One kind of welding that does not use an arc is…. .
   
3. 
   Shielding gas protects the weld by … .
   
4. 
   Flux can be made of many things, but it can be … .
   
5. 
   Oxygen in the air will cause big problems in … .
   
6. 
   There are two main ways to shield an arc welding, they are … .
   
7. 
   Welding is a way of heating pieces of metal using … .
   

Ex.8 Ask questions to get the following answers:

1. 
   Welding is a way of heating pieces of metal using electricity or a flame so that they melt and stick together.
   
2. 
   The most common type is arc welding.
   
3. 
   There are different kinds of arc welding too— shielded metal arc welding (SMAW) is a common type.
   
4. 
   During welding, the flux will melt and some of it will evaporate.
   
5. 
   One kind of welding that does not use an arc is Oxy-fuel welding (OFW), sometimes called gas welding.
   
6. 
   Shielding gas protects the weld by being a pocket of gas around the weld
   
7. 
   IV. Comprehension
   
8. 
   Ex. 9. Agree or disagree with the following statements.
   
9. 
   Welding is a way of heating pieces of metal using electricity or a flame so that they melt and stick together.
   
10. 
    There are two kinds of welding: arc welding, and resistance welding.
    
11. 
    . Anyone who is near arc welding doesn’t need to wear a special helmet or goggles.
    
12. 
    One kind of welding that does not use an arc is Oxy-fuel welding (OFW), sometimes called gas welding.
    
13. 
    All types of welding require that the cold metal have protection.
    
14. 
    Flux can be made of many things, but it can be a solid or a paste.
    
15. 
    Shielding gas protects the metal.
    
16. 
    One type of welding that uses flux is gas tungsten arc welding .