Abstract
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 tests reproducing expected operation conditions in W7-X. Metallography examinations indicated the good adhesion without pores or cracks on connectors. The main characteristics of the coating are: a ∼1μm thick Ni interlayer, a 0.3mm thick and 20mm long Cu coating. The previous un-tight target elements passed the He leak testing in vacuum oven after coating.
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