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STRESS CRACK AFTER ULTRASONIC WELDING OF ADAPTORS
10 April, 2010 - 07:27 — pskkumar1960
We have been using U/S welding to join top and bottom housings of Adaptors.
The Raw material of plastic is ABS or Cycolac.
The stress cracks are developing over a period of time say 5 to 10days after the U/S welding.
We normally do a Chemical test to determine the stress , by immersing the welded part in Actic Acid glacial and pass through running watter for 30 sec.
However in our production site we could not identify the stress cracks and invariably the cracks are developing at the customer end.
Need help in
identifying the root cause for such stress cracks
methods to release the stress at moulded part stage and as well as after welding.
Regards,
pskkumar
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