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Tutorial: Evaluating your Plastic Welds

5/14/2019

 
TRIAC ST being used to repair a car bumper
​It’s important to evaluate each plastic weld to ensure your final product is strong and resilient. Particularly when speed welding with a hand tool, small defects in a single weld can be magnified as beads are built up to the base material’s thickness. Several key indicators allow you to evaluate your welds without the need for destructive tests.  

Correctly welded seams:

  • Slight flattening of the welding rod
  • No notches between the welding layers
  • For PVC:
    • Foamy to smooth bead
    • No discolouring (e.g., brownish colour)
  • For PE, PP, PVDF:
    • Smooth double bead on both sides
    • Dull surface in the area of the welding zone
Example of a correct plastic weld
Example of a correctly welded seam.

Flawed welding seams:

  • No building of bead or welding rod still round
    • Temperature too low
    • Speed too fast
    • Welding force too small
  • Notches between the welding layers
    • Distance between the layers is too large
  • In particular with PVC: brownish discolours of the welding bead
    • Temperature too high or speed too slow
  • In particular for PE, PP, PVDF: shiny welding zone
    • Temperature too high or speed too slow

Recommended Further Reading:

  • How-to Video: Easy repair of plastic boxes and containers
  • Choosing the Right Tool for your next Plastic Welding Project: Hand tools vs. Extrusion Welders
  • Welding Parameters for Hand Welding Plastics
  • Identifying Plastics for Fabrication and Repair
Originally published: 9/19/2014

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  • Home
  • Equipment Supply
    • Flooring
    • Geomembrane
    • Industrial Fabrics
    • Manufacturing
    • Plastic Fabrication
    • Roofing >
      • Distributors
  • Engineering Services
    • Engineering Services
    • Cosmetics
    • Deflashing Systems
    • Drying Bottles & Cans
    • Heat Systems
    • Shrinking Labels
  • Repair
    • Repair Service
    • Tech Tips
  • Resources
    • Articles
    • Case Studies
    • Engineering Information
    • Whitepapers
  • About
    • About Us
    • Technology Providers
  • Contact