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  • Writer's picturePlasTech Services Inc.

How to Identify and Fix Common Plastic Welding Problems

Plastic welding is a crucial process for extending the life of plastic equipment, such tanks and pipes, in many industrial facilities. Repairs involving industrial plastic welding have been our specialty for more than 30 years at PlasTech Services Inc. In our experience, thermoplastic difficulties can still occur even with the best tools and techniques.





Problem 1: Poor Weld Strength

Weld strength issues are one of the most prevalent issues with plastic welding. Several things, such as inappropriate plastic surface preparation, the wrong welding temperature, or inadequate pressure, might contribute to this. Before welding, make sure the plastic surfaces are clear of any impurities to solve this issue. Utilize the proper welding pressure and temperature for the type of plastic being utilized. Make sure the welding process lasts long enough for the plastic to melt and fuse correctly.


A bond test is an additional crucial factor to take into account when evaluating weld strength. Discounted or inexpensive plastic, such as a plastic tank, may have been so economical because it was made using spare parts or plastic components that caused bonding tests for repair materials to fail. It's been done before. Therefore, do a bond test on the tank to ensure you can fix it before buying a plastic tank or pipe.


We don't want to imply that all plastic tanks are cheap or cannot be fixed; rather, we want to emphasize the significance of selecting the proper tank made of the appropriate material.


Problem 2: Warping or Distortion

The plastic warping or distorting during the welding process is another frequent issue. This may be brought on by the plastic being heated unevenly or by using excessive pressure when welding. Make sure the plastic is heated uniformly and apply the proper pressure for the particular type of plastic being used to solve this issue. To avoid warping or distortion, keep the plastic in place while welding using a clamp or jig.


Problem 3: Cracking or Splitting

Another frequent issue is the plastic cracking or breaking while being welded. Inadequate plastic surface preparation or employing a welding temperature that is too high can also contribute to this. Before welding, make sure the plastic surfaces are clear of any impurities to solve this issue. For the particular type of plastic being utilized, use the appropriate welding temperature. To further avoid cracking or splitting, keep the plastic in place during welding using a clamp or jig. As previously mentioned, perform a bond test to the plastic before attempting a crack repair.


Problem 4: Discoloration

Plastic discoloration is a frequent issue that can arise during the welding process. This can happen when utilizing a welding temperature that is too high, being exposed to heat or UV radiation, or both. Use a welding temperature suitable for the particular type of plastic being used to solve this issue. Additionally, shield or cover the plastic to prevent it from being exposed to heat or UV rays.


In conclusion, plastic welding is an essential process for many industrial applications, but it can be challenging, and problems can occur. By understanding the most common problems and knowing how to identify and fix them, you can ensure a successful outcome. At PlasTech Services Inc, we provide professional industrial maintenance services to help you keep your plastic welding equipment in top condition. Contact us today to learn more about how we can help you with your plastic welding needs.


Phone: 1-410-737-4700

Email: Contact@plastechservices.com

Quote: www.plastechservices.com/quote

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