Work on plastics - welding and sealing

In high-temperature work, there are many techniques for handling material. They often require specialised skills and involve different risks. We present two methods for welding and sealing plastics: 

  • electrofusion 
  • butt. 
Welded objects

Electrofusion welding 

Such welding involves joining pipes using fittings that incorporate suitable heating elements. What needs to be done initially is to remove an inner layer of 0.2 millimetres from the surface of the pipes to be joined. This is followed by clamping the pipe with the fitting. The welding machine then transmits an electrical impulse to the fitting, which consequently fuses the fitting to the pipe. Once the joining process is complete, the whole thing is cooled down and the structure is ready. 

Butt welding 

This type of welding is used to join pipes with wide diameters. This method is characterised by high safety, accuracy and, above all, reliability. First, the surface of the pipes must be heated until a sufficient temperature is reached. The heated components are then joined together using special clamping pressure. This is not a time-consuming process and is characterised by high economy and precision. If you have, for example, pipes whose diameters are noticeably large, this type of welding is the ideal solution. 

Classification of plastics 

There are several characteristics that determine whether a material will be suitable for different processes and these are: 

  • low material production costs, 
  • processing and transformation capacity, 
  • high tolerance to harmful conditions (for example chemical), 
  • not very high material weight. 

What usually eliminates the material from use are factors such as: 

Welded objects
  • being a flammable material, 
  • poor tolerance of higher temperatures, 
  • detrimental to ecology. 

When it comes to the construction of plastics, two types can be distinguished: 

  • duroplastics (here, in turn, there are thermosets and chemosets), 
  • thermoplastics. 

Elastomers - Reversible plastics 

Elastomers are plastic and natural materials whose deformation can be reversed and restored to their original form. 

Examination - welder and welder 

  • The examination consists of theory and practice. The theoretical part consists of the following: practical principles of welding and welding instruction, 
  • approximately 20 examination questions, 
  • multiple-choice test, 
  • Approximately one hour for the entire examination, 
  • work stripped of all teaching aids. 

The entire examination is assessed by examiners specialising in welding and sealing plastics. To pass the exam, it is necessary to pass both the theoretical and practical parts.

Once you have passed the examination, you receive a certificate which is valid for 2 years. If you wish to extend your entitlement, you must apply for a new one no later than 3 months before your previous entitlement expires. Usually, you do not have to take the examination again, as long as you have actually carried out work in this position during the validity period of the licence. 

REGISTRATION: +48 504 477 077