Plastics welding applications extend from assembly welding for mass-produced domestic appliances to fabrication welding of pipelines and from high speed welding of films and fabrics to precision welding of medical devices.
There are several companies, which have wide experience and in-depth involvement in these areas of application. Plastic welding can be conducted in volume or in small batch or as a prototype production.
Plastics welding techniques are also varied; they range from well-established processes - such as ultrasonic or hot gas welding - to novel techniques employing microwave or infrared energy. At time the companies offer these Plastic welding specialize in one or couple of techniques but it is not difficult to find a providers of the whole gamut of plastic welding.
The list of plastic Welding Techniques is as follows:
· bead and crevice free (BCF)
· forced mixed extrusion (FME)
· heat staking
· hot bar
· hot gas
· hot plate/butt fusion
· polymer coated materials/PCM
· radio frequency/RF/HF/dielectric
· resistive implant
In case you are going to undertake plastic welding, it is important that you get the operators who would be performing the weld jobs to train in this particular field. It is very different technique and it would be prudent to educate your operates in a correct for. This would ensure quality welds and fewer overhead costs – as you would have less damage pieces.
Though it may appear that plastic welding is easy, but it requires skill to understand and comprehend the importance of all the parameters, preparations, and exercises, it can be difficult to achieve quality welds. Most expert welder would suggest formal training for the operators before they use this technique.
Rotational molded parts are more often than not pretty stress-free. This is because the resin is by and large in powder form. However, as the parts shrinks on cooling it may create a certain amount of stress to the parts. The quantity of stress would vary depending up on a number of factors, such as - shape, material thickness and cooling time and the welding system you use, to list a few.
In general, stress is not such a big problem, as all material does have some form of stress, especially plastic, where as the plastic cool post the plastic welding stress increases. Typically, you would notice that you would witness stress when you use a grinder as a spin-welding unit. Though this technique is a cheap and quick, but necessarily a good solution, as you would have no control over the 3 necessary weld parameters:
To have better control over the above-mentioned three welding parameters, temperature, time and pressure, you should use a true spin welder. You may also want to consider using an injection welder or variety of hot gas welders and spending some more time during you wielding process.