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Types of welding
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1. Translate into Russian:cylinder, set up, flame, variety, anvil, friction, high-frequency
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2. Explain the abbreviations:1) CW   2) DC  3) AC   4) FRW                                                                                                                                     a) Arc welding   b) Direct current  c)Friction welding   d) Continuous Welding
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3. March the words in the columns to make phrases.  1 prepare 2 make 3 explosive  4 high 5 rapid                                  a) velocity  b) surfaces  c) rotating   d) process   e) joints
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4. Fill  in  the  blanks  with  the  right  words  (namely,  types  of  welding).  1.  ……… welding can be accomplished  simply  by  pressing  them  together. 2. In  ………welding  two  work  pieces  are  brought  together  under  load  with  one  part  rapidly  revolving. 3. ………..welding  is  accomplished  when  the  light  energy  emitted  from  a  laser  source  focused  upon  a  work-piece  to  fuse  materials  together. 4. ………….. joining is achieved by clamping the two pieces to be welded between an anvil and a vibrating probe or sonotrode. 5.  ……………welding  takes  place  when  two  plates  are  impacted  together  under  an  explosive  force  at  high  velocity.
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5.Match the following questions with the answers. 1. What is arc welding? 2. What is the function of flux in shielded metal arc welding? 3. What  problem  is  related  to  the  use  of  alternating  current  in  gas  tungsten  welding? 4. What do the welding protection clothes include?                                                         a) The  voltage  is  directly  related  to  the  length  of  the  arc,  and  the  current  is  related    to   the   amount   of   heat    input. b) Flux  cored  arc  welding,  and  submerged arc welding. c) A  negatively  charged  electrode  results  in  more  shallow welds. d) To  protect  bystanders,  transparent  welding  curtains often surround the welding area.                                                                                                  
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