超音波映像法を用いた超硬合金と銅タングステンろう付部の品質評価の研究

概要

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This report discussed the new method to evaluate the brazed joint strength between cemented carbide alloy and sintered Cu-W joint by using the ultrasonic image. The brazing was performed in a vacum at 1213 K to 1333 K for 60 s to 1.2 ks to vary the joint strength. Although the joint strength made by filler metal containing Pd closed to that of the base metal, Cu-W, at 1213 K, it decresed at higher temperature heating and after prolonged holding time. The ultrasonic image of the brazed joint was measured through the cemented carbide alloy of 4 mm in thickness. In order to correlate a brightness of the ultrasonic image with the joint strength, the relative echo intensity, R, was defined by equation (1) [numerical formula](1) where I_<rl>is reference data, I<dl> is sampling data and n is sampling number. R calculated from these data correlated to the shear strength. Good correlation with r=-0.86 was achieved between R and the joint strength. A microstructure in the joint cross section was investigated comparing with the ultrasonic image.
社団法人溶接学会の論文
1994-05-05