Welder's special equipment operating license (pressure-bearing equipment welding) assessment and issuance is the Quality Supervision Bureau.
General personnel to take the Safety Supervision Bureau. If your company has special equipment, you need to take the latter.
Should be able to, general special equipment welding work, the training period to learn general welding content.
and can go from high to low, but not low for high.
It should be possible. General special operations license above the scope of operation of the work operation regulations.
Special equipment welding operation must hold a special equipment welding license, or else violate the "Special Equipment Safety Law" in the unlicensed, as long as the welding are required to hold the Safety Supervision Bureau's operating license welder item, otherwise it is also illegal.