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The paper describes recent trends to carry forward the automation in welding process in Japanese industries.The present situation on the introduction of computer integrated manufacturing is surveyed and its concept and relation among the constituent subsystems are shown.Also recent developments of arc welding processes and related tools are reviewed.They are as follows.1) Schematic image of the structure of computer integrated manufacturing system (CIM).2) Short descriptions for the trend of introducing CIM system.An example of multi-robot welding system in shipyard,virtual factory,network monitoring of welding quality,clarification of welders skill.3) Development of high efficiency welding processes.Copper-less wire electrode,tandem large fillet welding,tandem pulse GMA welding,digital wire feeder with new push-pull system,overhead horizontal tandem GMA welding for ship bottom shell,one-sided fillet groove GMA welding for construction machinery,ultra-NGW hot wire GTA process,Al-alloy sheet welding with laser assisted AC pulsed MIG process.