Actual stress analysis of welded part using quantum beam hybrid method

Suzuki, Kenji*; Miura, Yasufumi*; Shiro, Ayumi*; Toyokawa, Hidenori*; Saji, Choji*; Morooka, Satoshi  ; Shobu, Takahisa  

The beam of synchrotron X-rays has the advantage that it can be so small, and we can make detailed stress maps using the X-ray beam. However, it is difficult to measure residual stresses of a welded part due to a dendritic structure. This difficulty is caused by the difference in the positions of the diffracted crystal grains. To solve this problem, we proposed a double exposure method (DEM). In this presentation, the DEM was applied to measuring the residual stress of the plate which was cut from the welded pipe. The detailed stress maps under a biaxial stress state were obtained. On the other hand, the residual stress distributions of the welded pipe under a triaxial stress state. From these results, the detailed stress maps of the root part of the butt-welded pipe were made up by the complimentary use of the synchrotron X-rays and neutrons. The results can significantly explain the initiation and propagation of SCCs. We name this analysis method the quantum beam hybrid stress analysis.