Plastic Assembly News

Routine Ultrasonic Plastic Welder Maintenance

The routine maintenance items for an ultrasonic welder are simple unless there is a machine failure.  The following are recommended maintenance procedures.


1.      Make sure that you have a Mylar washer between the converter and booster and between the booster and horn.  We recommend replacing these washers every 6 months.  A bag of (10) Mylar washers can be purchased for $12.00 from Plastic Assembly Technologies, Inc. at


The Plastic Assembly Technologies part numbers are as follows:


·         MW-12 for a bag of (10) Mylar washers for use on ultrasonic horns and boosters with ½-20 studs

·         MW-38 for a bag of (10) washers for use on ultrasonic horns and boosters with 3/8-24 studs.


2.      When disassembling the stack (ultrasonic converter, booster & horn) for replacing the Mylar washers, check the studs to make sure they are properly torqued.  The stud torque is 290 inch/lb for 3/8-24 studs and 450 inch/lb for ½-20 studs.  When reassembling the stack, the torque specification of the converter to the booster and the horn to the booster is 220 inch/lb.


3.      Drain the air filter as required if it has collected moisture.  Dry air is recommended as air with moisture will eventually impact the functionality of the pneumatic system.


4.      Once a year or more in dirty environments, use light air pressure or vacuum to clean the inside of the power supply. Make sure the power is disconnected before following this procedure.

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Plastic Assembly News