Relationship between ultrasonic parameters and strength of diffusion welds of dissimilar metals.

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  • 拡散接合した異種金属材料の接合強さと超音波因子との関係
  • カクサン セツゴウシタ イシュ キンゾク ザイリョウ ノ セツゴウ ツヨサ ト

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Ferrous (mild steel and stainless steel) and non-ferrous (Ti and Ni) alloy plates were diffusion-welded under thermal cycles including the solid-state transformation temperatures of the mild steel and titanium by placing them in the cylindrical electrodes, and the relation between the shear strength of joints τj and the ultrasonic echo intensity from the joint interface was investigated. The relation between the formation of reaction layer at the joint interface and the ultrasonic echo intensity was also investigated. In the mild steel/Ti and stainless steel/Ti joints, a brittle reaction layer was formed at the joint interface, and no relation between τj and the area of joints Aj (the area of good welding estimated from the fracture surface) was found. No relation between τj and the diameter Du estimated from the distance of low ultrasonic echo intensity from the joint interface was also found. In the mild steel/Ni joints, no reaction layer was formed at the interface. The strength of the joints varied linearly with the area Aj, and had a quadratic relation with Du. When no reaction layer was formed at the interface, the echo intensity ratio (Re) was in good agreement with the reflectivity (r) at the interface over the joined region. When the reaction layer was formed at the interface, the variation of Re disagreed with that of the calculated echo intensity ratio.

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