User`s manual

Section 8 – Troubleshooting
Dukane Part No. 403–556–03 Page 73
Welding
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Problem
Uneven welding (continued)
Probable Cause Solution
Part dimensions are incorrect. Check the part dimensions.
Re-dimension the part, if necessary.
Check the molding conditions.
The parts are improperly aligned. Check for part shifting during welding.
Check the alignment of mating parts.
Check for parallelism of the horn, the part, and/or
the xture.
There is a lack of intimate contact Check the part dimensions.
around the joint area. Check the part tolerances.
Check for knockout pin marks in the joint area.
Check for misalignment of the mating part halves.
Check for sinks.
Non-uniform horn contact is occurring. Check the t of the part to the horn.
Check for proper support in the xture.
Mold release is on the joint surface(s). Clean the mating surfaces.
There is a non-uniform distribution of Check the molding conditions.
ller in the plastic material. Check the mold design.
The joint design is incorrect. Redesign the joint.
There is a material or resin grade Consult with the resin supplier(s).
incompatibility problem.
There is a regrind problem. Check with the molder.
Check the molding conditions.
There is moisture in the molded parts. Specify the parts to be “dry as molded”.
Dry the parts by heating them prior to welding.
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