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61
4. Why is Electrogas welding relatively unsafe and hazardous?
5. What is the difference between Electrogas and Electroslag welding?
6. Why does the operator have to wear protective clothes?
13 Complete the following sentences.
1. To ensure safety while using arc welding processed operators have to
wear… .
2. Electroslag welding is no more used to weld… .
3. In Electrogas welding the weld area is protected from atmospheric
contamination … .
4. In Atomic Hydrogen Welding the work itself becomes… .
5. Since Electrogas welding is performed at great heigh… .
Writing
14 Write a short report about arc welding. Include the items below.
Speaking
15 Discuss the following questions in the group.
1. What is the difference in methods of gas cutting and gas welding?
2. Is there any difference in equipment used for gas welding and gas cutting?
3. What might be the advantages and disadvantages of gas cutting compared
to other methods of cutting metals?
4. Do you remember what appeared before: arc or gas welding?
5. What type of cutting (arc or gas) is :
a) more expensive
b) more operator skills demanding
c) safer
e) faster
Ø Types (SMAW, MMA, GMAW, MIG, FCAW, SAW, GTAW, TIG,
electroslag welding, stud arc welding, EGW)
Ø Types of filler material used (consumable/none-consumable,
covered/bare electrode/wire)
Ø Type of current used (direct/alternating)
Ø Type of shielding gas used (helium, argon, CO2)
Ø Major application areas
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