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This type of insertion can be done rapidly, with short cycle times, low residual stresses. Good melt flow characteristics for the plastic are necessary for the process to be successful.

The ultrasonic equipment is relatively expensive, and also needs a custom horn for optimal production rates.

The advantage of this method is that the special tooling necessary is relatively simple, usually a cylindrical tool, which can be easily, fabricated in the machine shop. The cycle times are usually short.

However, care has to be taken, not to overheat the insert or the plastic, or it will lead to local plastic degradation.
 

This process is fast and requires no special tooling. However, high hoop stresses are generated, so the boss design has to be robust. Also, the retention is strictly based on press fitting and the small amount of material that flows inside the barbs. Thus retention is not very high.
 

This process slows down the operation of the mold, since the inserts have to be manually placed inside the mold. Inserts can be automatically placed in a mold, but this greatly increases the complexity and cost of the mold. This can only be justified if the volume of production is very high to offset the cost savings in shorter cycle times.