Proper Welding Techniques - General Considerations - Drader W30000 Instruction Manual & User Manual

7. Proper Welding Techniques – General Considerations
Consider these variables when welding plastics.
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Material
In order to achieve quality welds, ensure that the welding rod matches the parent
material. For example, match polyethylene with polyethylene rod and match
polypropylene with polypropylene rod.
Do not expect a quality weld if the parent material and welding rod do not match.
Heat
Each plastic melts within a certain temperature range. When you drift outside this
zone, the weld quality diminishes.
Some people turn up the heat in order to weld faster, yet they sacrifice weld strength.
Do not be tempted to weld faster by raising the weld temperature!
Pressure
Pressure allows the plastic molecules of the materials to mix. Best bonding occurs
when there is a physical mixing of the plastics.
Pressure, when too high or too low, reduces weld quality.
Time
Plastic needs time to melt and time to cool down. Do not speed up the cooling time.
After welding, plastic molecules need 24 hours to come to a complete rest.
Plastic should be at "room temperature" for at
least 24 hours before it is welded.
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