As known as typical texture material with coarse grain, weld metal or its vicinity meets difficulties in residual stress measurement especially using sin 2 ψ method with conventional zero or one-dimensional X-ray diffraction. In this study a two-dimensional X-ray diffraction system based on cosα method is developed for in-service residual stress measurement of weld metal in structural components. Validity of residual stress measurement using this system is verified by several confirming tests including nickel-based weld metal. Positioning jig is designed and fabricated for welds on the shroud support plate of boiling water reactor (BWR). Setup test on the mock-up of BWR bottom area shows the possibility of in-service measurement using this system.

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