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  • Worksite | First pillars for the crane hall

    For the overhead cranes to deliver machine components into the Tokamak assembly pit, the rails that carry them need to be extended some 80 metres beyond the tem [...]

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  • Transport | 300 tonnes of equipment on its way to ITER

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  • Fusion world | A new tokamak in town

    After EAST in China and WEST in France, another of the cardinal points of the compass has been chosen to name a tokamak. Introducing NORTH—the NORdic Tokamak de [...]

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  • Opportunities | Bringing the ITER Business Forum to Washington

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  • World Energy Congress | Fusion "at a time of transition"

    In the United Arab Emirates, Abu Dhabi is often referred to as a tourism hotspot that combines luxury and ancient traditions. In September, Abu Dhabi was in the [...]

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Of Interest

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Cryostat

Next phase for lower cylinder

At approximately 250 tonnes, the second tier of the ITER cryostat's lower cylinder represents only 15 percent of the cryostat's total weight. Still, in order to weld together its many segments, no less than 1.3 tonnes of filling metal will be required—another amazing figure that opens a window into the unique world of the super-massive ITER components ...

Working in pairs, one man on either side of the massive steel plates, welders will use approximately 1.3 tonnes of filling metal to finalize the welding of the second tier of the cryostat's lower cylinder. (Click to view larger version...)
Working in pairs, one man on either side of the massive steel plates, welders will use approximately 1.3 tonnes of filling metal to finalize the welding of the second tier of the cryostat's lower cylinder.
Following a traditional coconut ceremony, welding operations began on 21 February in the onsite Cryostat Workshop for the second level (tier two) of the lower cylinder.

Operating in tandem, one on either side of the cylinder's steel plates, welders will progressively fill the 5.2-metre-high, 50-millimetre-wide, trough-shaped seams between the segments using a technique called "butt welding." The total length of the welds for this part of the lower cylinder will add up to 160 metres.

Controlling distortions is always an issue when welding large high-tech components. "In the ITER cryostat, because of the number of openings, ports and penetrations and also because of the sheer mass of welds involved, welding is a considerable challenge", explains Vikas Dube, the responsible officer for manufacturing activities in the workshop.

Welding operations on the second tier of the lower cylinder should be complete by late March and the whole assembly (tiers one and two) is expected to be ready for factory acceptance testing in June.

 


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