The welding wire is used for the permanent junction of components made of the same material, with the same or very similar molecular weight and density. This procedure, named polyfusion, occurs with the use of welders or extruders that bring the material to its fusion temperature, making it possible for the parts to join. Unlike density, the color of the components does not affect the consistency of the welding.
There are different welding techniques:
- Hot air plastic welding;
- Socket welding;
- Butt welding;
- Infrared welding
The hot air welding method uses the welding wire. This wire or stick, depending on the machine, is inserted in a special torch and then melted thanks to the hot air generated by the gun. The material that exits from the nozzle gets lodged inside a previously prepared cavity. For the sheets with a low thickness or for the applications in which the welding is possible only on one side, usually the best method is the “single V” weld, whereas, for thicker sheets is suggested the “Double V” weld (X). This process allows a fast and highly resistant weld.
Thanks to welding wire, such components as galvanic tanks, pickling plants, extractor fans, liquid transport pipes and scrubber towers can be made.
HPE International produces welding wire in HDPE and PP-H in 2 different dimensions:
- Round wire with diameters from 3 to 5 mm;
- Plate wire 3×5 mm and 3×7 mm
Polypropylene is the easiest thermoplastic to weld and for this characteristic it’s used in many applications. Furthermore, PP has an excellent chemical resistance, low specific gravity, high tensile strength and is the most dimensionally stable polyolefin.
Polyethylene, another fairly easy thermoplastic to weld, is characterized by an optimal resistance to impacts, exceptional abrasion resistance, high tensile strength, is machinable and has low water absorption.
How to use our welding wire
Attentions for a correct use of our welding wire:
- Sheets, rods or any other plastic product and welding wire must be equally melted;
- Temperature and air flow have to be regular;
- Both the welding wire and the surface must be clean;
- The air from the torch must not be polluted by water, oil or dirt;
- The junction must have a “V” pointed cavity;
- There must be no air bubbles in the weld;
- Speed, temperature and time are fundamental and must be respected. Follow the recommendations of the suppliers of the welding machines.