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Water connectors of the divertor target elements of Wendelstein 7-X (W7-X) are made of CuCrZr with a Ni (270) transition to stainless steel 316L. A small He leak rate was always detected in the welding area between 316L and Ni of some target elements. To seal these connectors, the coating onto round tubes with very high purity oxygen-free Cu CW009A was developed. This technology was validated with...
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