High Frequency Welding Machines (also called RF Welding Machines or Radio Frequency Welding Machines) are widely used in manufacturing PVC, TPU, EVA and PU products such as medical bags, inflatable products, rain ponchos, tarpaulins, stationery, blister packaging and automotive accessories.
However, during daily production, manufacturers may encounter several common welding problems. Understanding the causes and solutions can significantly improve productivity and product quality.
1. Weak or Incomplete Welding
Problem
The weld seam is weak, easy to separate or not completely sealed.
Possible Causes
Insufficient welding time
Low RF power output
Incorrect pressure setting
Dirty welding mold
Material thickness variation
Solutions
✔ Increase welding time gradually.
✔ Check and adjust RF power output.
✔ Ensure sufficient pneumatic pressure.
✔ Clean the welding electrode regularly.
✔ Use materials with consistent thickness.
2. Material Burning or Overheating
Problem
The material becomes yellow, burned or melted.
Possible Causes
Excessive welding time
Too much RF power
Incorrect mold design
Poor cooling
Solutions
✔ Reduce welding time.
✔ Lower output power.
✔ Optimize mold design.
✔ Improve cooling between welding cycles.