Dukane iq series User Manual page 130

iQ
Series Ultrasonic Press System LE User's Manual
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Problem
Uneven welding
Probable Cause
Part dimensions are incorrect.
The parts are improperly aligned.
There is a lack of intimate contact
around the joint area.
Non-uniform horn contact is occurring.
Mold release is on the joint surface(s).
There is a non-uniform distribution of
filler in the plastic material.
The joint design is incorrect.
There is a material or resin grade
incompatibility problem.
There is a regrind problem.
There is moisture in the molded parts.
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Page 122
Welding
Continued from Previous Page
Solution
Check the part dimensions.
Re-dimension the part, if necessary.
Check the molding conditions.
Check for part shifting during welding.
Check the alignment of mating parts.
Check for parallelism of the horn, the part, and/or the
fixture.
Check the part dimensions.
Check the part tolerances.
Check for knockout pin marks in the joint area.
Check for misalignment of the mating part halves.
Check for sinks.
Check the fit of the part to the horn.
Check for proper support in the fixture.
Clean the mating surfaces.
Check the molding conditions.
Check the mold design.
Redesign the joint.
Consult with the resin supplier(s).
Check with the molder.
Check the molding conditions.
Specify the parts to be "dry as molded".
Dry the parts by heating them prior to welding.
Continued
Dukane Manual Part No. 403-586-02