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NDE/NDT ultrasonic weld online process sensors

NDE/NDT ultrasonic weld online process sensors

NDE/NDT ultrasonic weld online process sensors

(OP)
I have some product failures I am evaluating.  The product consists of ultrasonically welded plastic parts. The current release criteria for these parts is a manual "tug" on the parts to determine whether or not the weld is holding.  Neeless to say, this practice is quite flawed, and I'm looking for a more automated approach.  I am encouraged by some of what I see about ultrasonics for sensing these potential flaws.  Does anyone have experience using ultrasonics to detect polymer weld flaws, voids or weaknesses?  Does anyone have a preferred supplier of such devices, or interpreting software?  

I see that pass-through detection (tranceiver and receiver on opposite sides of workpiece) as a common practice.  My parts are rather low clearance, so I wonder if a reflectance or echo detection (transeiver and receiver on same side of work piece) will give me a useable signal.  Again, please share your experiences if they apply.

Thanks in advance.

ChemE, M.E. EIT
"The only constant in life is change." -Bruce Lee

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