本研究以316L不銹鋼為底材，銲料使用ER308L和Inconel 52M，
透過 GTAW 銲接方法，採用 Temper bead 銲接技術製作不同覆銲厚度
之超音波檢測階梯規塊。使用超音波檢測，透過斜束式投捕檢測法檢
測不同覆銲層厚度超音波訊號位置，探討不同覆銲層厚度與微觀組織
對超音波訊號影響。
實驗結果顯示，52M 銲接組織凝固取向使覆銲層具有彈性異向
性特性，造成超音波探頭在同平面不同方向檢測，超音波折射角度不
同。在超音波探頭音近場區與聚焦區，受覆銲層內富 Nb、Ti 之化合
物溶解回基地組織影響，使晶粒變形降低音速，覆銲層內超音波音速
變慢，造成實際路徑呈現弧形。覆銲層長晶粒呈一傾斜方向，使遠場
發散範圍內訊號受到晶界析出物影響程度不同，導致覆銲層越厚訊號
位置越往探頭偏移。

This study used the Inconel 52M and ER308L to clad SUS 316L
stainless steel, using Gas Tungsten Arc Welding (GTAW). The block for
ultrasonic adopting the welding techniques of Temper bead to produce
different thickness of the block for Ultrasonic Testing. Detecting the
ultrasonic signal of different thicknesses of welding layers by Angle Beam
Pitch-Catch Method to research the effect caused by the different
thicknesses and microstructure.
Experimental results showed that 52M cladding was elastic anisotropic
due to solidification orientation, causing the ultrasonic wave to have
different refraction angles in different directions on the same surface. In
the near-field region and focal zone, the rich compounds of Nb and Ti
dissolved into the matrix, leading to the decrease of the acoustic velocity
caused by the lattice distortion, causing the real path to be curved. The
cladding grains were inclined so that the divergence ranges of signal in the
far-field region were affected by the grain boundary precipitations, causing
the thicker the cladding layer is, the more the signal is shifted to the probe.

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