Basic Things about Welding Thermoplastics

Welding is one skill that many people uWeldingndervalue, when in fact, it has become one of the most essential today. It requires basic knowledge and experience to get the job right. You need the right tools and wear safety gears like gloves and face mask.

For your own safety, consult a professional welder and learn from their experience. To learn more and improve your skills, look for poly welding courses in Brisbane institutions.

What is poly-welding?

This is the process of attaching or uniting surfaces by softening them with heat.  In poly welding, choosing the right materials is essential. For better results, make sure your substrates and welding rod are compatible or identical. For example, polypropylene to polypropylene, polyethylene to polyethylene, and polyurethane to polyurethane.

There are two common types of thermoplastics and the ways to weld them:

  1. Polypropylene

This is the easiest thermoplastic to weld. This type has excellent chemical resistance and features low specific gravity with high tensile strength, providing more stability among the other types. Many manufacturers use this material for plating equipment, fume hoods, scrubbers, etchers, ductwork, and tanks.

For polypropylene, you need to set the temperature at approximately 300 degree Celsius. Consult an expert for more accuracy. In case you use a thermoplastic welder with a 500 watts and 120 volt heating element, make sure to set the air regulator at approximately 5 psi. You should be in the vicinity of 300 degrees Celsius, as well.

  1. Polyethylene

Polyethylene is popular for its strong impact resistance. It has exceptional abrasion resistance and high tensile strength. People use it for making bins and liners, cutting boards and slides, tanks, and even laboratory vessels.

For polyethylene, the higher the density, the more difficult it is to break down the components. If it cannot be broken down at the same rate, you cannot weld them properly. So make sure the densities are compatible. Other than this, these thermoplastics are easy to weld. Low density polyethylene requires 270 degree Celsius, and set the regulator to approximately 5-1/4 to 5-1/2 and rheostat at 5. On the other hand, high density polyethylene requires 300 degree Celsius.