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Heating element butt welding |
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Description of process
The joining areas of the
plastic pieces are pressed against an accordingly heated up element
until enough material is melted.
The heating element is removed and the plastified surfaces of the
plastic pieces are pressed together.
The pieces cool down under pressure or way-limited until the melt is
resolidified.
Weld fillers are not needed.
Description of variants
Methods with standard
temperature:
The heating element temperature is in the range of the melting
temperature of the plastic materials to be welded.
The heating elements are normally anti-stick coated or covered.
Thermoplastics with a melting point up to approx. 270°C can be
processed.
Methods with high
temperature:
The heating element temperature is higher than the melting temperature
of the plastic materials to be welded.
The heating elements are normally not coated.
Practically all thermoplastics can be processed independent from their
melting point.
Due to this method, there is a high emission of smoke. |
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Heating element socket welding |
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Description of process
The ends of the plastic pieces
are pushed into or over an accordingly heated up element until enough
material is melted.
The heating element is removed and the plastic pieces are pushed into
each other at the plastified ends.
The pieces cool down while sticking together until the melt is
resolidified.
Weld fillers are not needed.
Description of variants
Standard method without
heated coil
The heating element temperature is in the range of the melting
temperature of the plastic materials to be welded.
The heating elements are normally anti-stick coated.
Thermoplastics with a melting point up to approx. 270°C can be
processed.
The energy input is performed by means of heating element spigots and
sockets.
Heated coil welding
Different thermoplastics can be processed depending on the availability
of fittings.
The energy input is performed by means of an integrated heated coil
which is connected to an external source of current. |
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Hotgas welding |
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Description of process
The plastic pieces are fixed
to each other at the joining areas.
The butt is melted with hot air until the surfaces are yielding under
pressure.
The joint can be strengthened by means of a weld filler of the same
material. |
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Extrusion welding |
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Description of process
The plastic pieces are fixed
to each other at the joining areas.
The butt is melted with hot air until the pieces can be welded with
additional material.
The weld filler out of the same material is melted in a barrel extruder,
ejected and pressed into the preheated butt. |
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Infrared welding |
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Description of process
The plastic pieces are
positioned with the butts having a special distance to the accordingly
heated up element until enough material is melted.
The input of heat is performed contactless in form of infrared radiation
and is for that reason not limited by the maximum temperature of an
anti-stick coating.
The heating element is removed and the plastified surfaces of the
plastic pieces are pressed together.
The pieces cool down under pressure or way-limited until the melt is
resolidified.
Weld fillers are not needed. |
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Laser welding |
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Description of process
The plastic pieces are fixed
to each other and exposed to laser radiation.
The input of heat is performed by the absorption of energy on the
surface exposed to radiation.
The pieces cool down under pressure or way-limited until the melt is
resolidified.
Weld fillers are not needed. |
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| Methods with input of
heat by means of internal energy carriers |
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Rotation friction welding |
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Description of process
The joining areas of the
rotation symmetric plastic pieces are pressed together and brought into
a rotating motion to each other.
The input of heat is performed by friction losses in the contact zone.
The pieces cool down under pressure or way-limited until the melt is
resolidified.
Weld fillers are not needed. |
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Vibration friction welding |
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Description of process
The joining areas of the
plastic pieces are pressed together and brought into an oscillating
motion to each other.
This oscillating motion can be modulated in a linear, orbital or radial
manner with adjustable amplitude.
The input of heat is performed by friction losses in the contact zone.
The pieces cool down under pressure or way-limited until the melt is
resolidified.
Weld fillers are not needed. |
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Induction welding |
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Description of process
Ferromagnetic electric
circuits are included in the joining areas of the plastic pieces, the
pieces are pressed together and exposed to an electromagnetic field.
The input of heat is performed by electric losses within the
ferromagnetic electric circuit.
The pieces cool down under pressure or way-limited until the melt is
resolidified.
Additional welding material is needed in form of ferromagnetic carriers. |
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High frequency welding |
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Description of process
The joining areas of the
plastic pieces with dielectric features are pressed together and exposed
to an electromagnetic field of high frequency.
The input of heat is performed by dielectric losses in the basic
material.
The pieces cool down under pressure or way-limited until the melt is
resolidified.
Weld fillers are not needed. |
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Microwave welding |
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Description of process
The joining areas of the
plastic pieces with dielectric features are pressed together and exposed
to a microwave field.
The input of heat is performed by phase displacements and effects of
polarisation causing energy losses in the basic material.
The pieces cool down under pressure or way-limited until the melt is
resolidified.
Weld fillers are not needed. |
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Ultrasonic welding |
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Description of process
The joining areas of the
plastic pieces with energy directors are pressed onto each other and
ultrasonic is inserted.
The input of heat is performed by friction losses in the energy
director.
The pieces cool down under pressure or way-limited until the melt is
resolidified.
Weld fillers are not needed.
reference:
www.Widos.de |
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