Study on Electron Beam Welding of Dissimilar Materials for Nuclear Plant (Report I) : Effect of Welding Conditions on Weld Defects(Welding Physics, Process & Instrument)

概要

論文の詳細を見る
In this paper, the weldability of some combinations of dissimilar materials for nuclear plant is investigated using electron beam welding, and the region of adequate welding condition is obtained for each combination of dissimilar materials. The results obtained are summarized as follows: (1) Kinds of weld defects are R-porosity and micro crack (neil-head crack and horizontal and vertical crack). (2) R-porosity occurres in all the combination with no relation to the materials, and it generates within the specific range of ab value. (3) Most of nail-head crack occurres in the combination with Inconel 617, and runs almost normal to bond at nail head of Inconel 617 side. This crack occurres almost without respect to welding condition. (4) The solidification crack of horizontal and vertical type is observed mostly in the combination with Incoloy 800H. This crack generates at lower or higher than the specific ab value. (5) The region of adequate welding condition where non-defect occurres is found to exist in the thickness less than about 15mm except for the combination with Inconel 617.
大阪大学の論文