FAQ Plastic Welding
General plastic welding information
Which materials can be welded?
The most important rule in plastic welding: one can only weld identical material. Therefore the identification of your material is key to select the correct welding rod !
- The main welding operation begins with preparation of the welding rod. Cut the end to a pencil point using a trimming knife or side cutter; this provides a progressive fill in V groove, particularly where it starts in the center of a panel, preventing the formation of bulbous protrusions of plastic.
- Fit speed welding nozzle to the Weldy Energy tool, set the correct temperature for the Material and allow the tools to warm up for a few minutes before starting.
- Insert the trimmed welding rod through the nozzle feeder until approximately 5mm protrudes on the underside. Hold the tool so that the speed welding nozzle sole runs along the crack parallel to the component surface.
- The protruding rod must be held beyond the start of the V groove so the heat is directed onto the start point for welding.
- When the surface plastic shows signs of slight wetting move the welding nozzle along the groove. The nozzle toe should rest on the rod in the groove while under the heel there should be an air gap of 3mm. Feed the rod steadily into the nozzle with a downward hand pressure of about 2.5 kg sufficient to push the softened rod into the groove. To judge what a pressure of 2.5 kg feels like, take a short piece of weld rod and use it to press down on a set scales until 2.5 kg registers. (Do not apply downward force to the weld via the hot air tool itself). Wherever possible the weld should be completed in one continuous run along the contour of the crack.