Plastic Welding and all about Plastic Welding

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					Plastic welding is the ability to take two pieces of plastic and weld them together. This
is a type of weld that will be done on children's toys, lawn furniture, automobile parts
and other types of plastic equipment that you may use everyday or commercially.

This type of welding is used to join thermoplastics when they are heated and under
pressure. Generally the pieces are fused together with filler material, but some
instances do not require filler material.

Plastic often has a shorter lifespan than most types of products because there are so
many things that can go into how it is maintained. Elements from nature like cold
weather, UV rays from the son or chemical contamination can create damage with
plastic. Plastic can also receive damage if it is hit hard like in a car bumper or other
hard surface, but the purchase of the new parts can be cost prohibitive; this is when it
may be a good idea to repair it instead.

There are different types of plastic so it is important to know which one you are
working with in order to make sure that the proper welding material is used. It is a
good idea to understand the difference between thermoplastics and thermosets
because thermosets cannot be welded.

The type of plastic that needs repair will require different welding rods and if you use
the wrong rod for the plastic you need to repair, there will be no bond. Materials like
Polyolefines have a lower surface energy so this means they cannot usually be
repaired with an adhesive or other types of glue. There are a special group of
polyolefine adhesives that can do this job.

When you are making repairs on plastic there are usually two types that you will
come up against -- you will either have to repair a crack or a broken part. If you find a
crack, it means that there is some type of stress affecting the inside of the material you
are using. This means that you will have to repair the crack and make sure it doesn't
continue through the piece.

There are several types of plastic welding. A few of them are:

? Hot gas welding uses a welding gun that has electric heating elements within in it
that produce a heat of hot gas.
? Hot plate welding uses a hot plate between the two surfaces that are being joined.
Ultrasonic welding uses a high frequency acoustic vibration to weld the pieces
together. These are placed under high pressure and then exposed to the vibrations until
the weld is completed.
? Spin welding where friction is used to weld two cylindrical parts as these parts
are rotated. At a certain time the rotation stops and the weld is completed.
? Vibration welding takes to pieces of plastic and exposes them to a frequency
called an amplitude. The two pieces are under pressure which causes a friction that
generates heat.

All of these types of welding work on plastic and they are geared towards working
with a variety of polymers.

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