#fastening__attachment  the act of fastening things together
  supertype:  #joining__connection__connexion  the act of bringing two things into contact; "the joining of hands around the table"
  subtype:  #soldering__bonding  fastening firmly together
  subtype:  #doweling  fastening by dowels
  subtype:  #grounding__earthing  fastening electrical equipment to earth
  subtype:  #linkage  the act of linking things together
  subtype:  #tying  the act of tying things together
     subtype:  #ligation  tying a duct or blood vessel with a ligature (as in surgery to prevent bleeding)
        subtype:  #tubal_ligation__tuballigation  a sterilization procedure with women; both Fallopian tubes are tied in two places and the tubes removed in between the ligations
  subtype:  #welding  fastening two pieces of metal together by softening with heat and applying pressure
     subtype:  #butt_welding  creating a butt joint by welding
        subtype:  #flash_welding__flashwelding__flash_butt_welding  butt welding by creating an electric arc between the two pieces which melts and joins them; used for joining segments of metal pipe

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