Work on plastics - welding and sealing

Welded objectsIn high-temperature work, there are many techniques for handling material. They often require specialised skills and involve different risks. This article will look at welding and welding methods on plastics, and more specifically two types of them, namely:

  • electrofusion
  • butt.

Classification of plastics

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

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

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

  • 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

Welded objectsSuch an examination consists, of course, of theory and practice. During the theory part, the standard guidelines are:

  • Practical principles for welding and sealing,
  • 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. In order to pass the exam, it is necessary to pass both the theoretical and practical parts. The sum of the marks includes the points obtained for practice and theory. In order for a special certificate to be awarded to you, you must provide personal details of yourself and this document must contain information such as the following:

  • date of results,
  • date of obtaining the document,
  • authentic signature of the examiner,
  • day until which the qualification is valid.

Normally, a certificate has a two-year validity if the relevant conditions are met. If a person takes a new exam before three months have elapsed, his or her entitlement will be renewed from the date of expiry of the previous ones.

Electrofusion welding

This kind of welding involves joining pipes using fittings that contain suitable heating elements. What needs to be done first 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 pressure. This is not a time-consuming process and is characterised by great economy and precision. If you have, for example, pipes whose diameters are noticeably large, this type of welding is actually an excellent solution.

REGISTRATION: +48 504 477 077