What are the typical qualification norms for assembly line workers?
IPC have international standard courses on assembly: http://www.eytraining.org.uk/t/Services/IPC-Training.aspx


  The five IPC certification programmes are:
  
  IPC A-610 Acceptability in Electronic Assemblies is for quality
  assurance/visual acceptance of electronic assemblies based on the
  world's most widely used electronics assembly acceptability standard
  
  IPC J-STD-001 Requirements for Soldered Electrical and Electronic
  Assemblies is for hand and machine soldering processes and material
  requirements. It includes hands-on training.
  
  IPC A-600 Acceptability of Printed Boards is for quality
  assurance/visual acceptance of unpopulated printed circuit boards and
  explores the specifications, problems and faults that occur with the
  manufacture of PCBs.
  
  IPC/WHMA A-620 Requirements and Acceptance for Cable and Wire Harness
  Assemblies is for improving the quality of your cables and harnesses,
  reducing errors and costs.
  
  IPC 7711/7721 Rework, Modification and Repair of Electronic Assemblies
  is for the rework, repair and modification of electronic assemblies,
  rather than scrapping them. It features hands-on training.