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High power, deep section electron beam welding can now be carried out at work piece chamber pressures in the range 0.1 to 10mbar. This coarse vacuum level can be readily achieved with local sealing on components too large to fit chambers, uses simple pumps and makes possible more rapid pump down of a chamber for production welding.
The welding performance of equipment at TWI matches if not exceeds the quality achieved at the lower pressure levels normally used for electron beam welding (EBW).
Immunity to gun flash-overs is one of the integral advantages of the system.
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