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Spin Welding is the process of Friction Welding fittings to
Containers or Tanks with high
RPM. When properly done the fitting becomes integral with the
Container and will
become Almost as durable as the Container.
The fitting and the container must be molded of compatible materials.
We mold all of our
fittings from a high molecular weight Low Density Polyethylene
with additives for good
adhesion and toughness.
0ur fittings are compatible with all grades of polyethylene except
Cross Link Materials.
We do not recommend Spin Welding for Cross Link parts. Also,
we do not advise using
Spin Weld Fittings molded from High Density Polyethylene. High
Density material does
not have long term ESCR capabilities, therefore Stress Cracking
can appear at an early
stage.
Please consider the following when Spin Welding:
- When attaching a Spin Weld Fitting, select an area as flat
as possible, where the
fitting and Driving Tool can turn freely.
- With the proper size Hole Saw, drill a hole in the container
slightly larger than the
pilot on the fitting. The fitting must be able to rotate freely.
- On small fittings (1/2'' and smaller) you can use a 1 HP
Electric Router. On
fittings measuring 3/4'' to 1-1/2'', a 1 to 1-1/2 HP to 2 HP
Electric Router is
acceptable. On fittngs 2'' and larger, we recommend a 3 HP Electric
Router with
at least 14 amps. On small fittings 1/2'' and smaller, we supply
drivers with 1/4" shanks. Our fittings 3/4'' and larger,
we supply drivers with 1/2" shanks. All electric routers
should have 18,000 to 25,000 RPM's.
- Place fitting pilot in the hole of the container. Holding
the Router in your hands
and having the driving tool attached to the fitting, turn on
the power and apply
slight pressure so that molten plastic starts to flow around
the outside diameter of
the fitting. You will develop a technique as to how to apply
pressure. The melting
process will only take 2-3 seconds. Turn off the power and keep
the driver in
position with applied pressure for another 5 seconds. This will
ensure a good
bond with approximately 1/4'' molten surrounding the diameter
of the fitting.
- After l minute you can apply testing procedures, such as
tapping with a hammer
or prying with leverage.
- We do not recommend Spin Welding with the use of a Hand Drill
or a Drill Press
because you cannot attain the required RPM.
- We do not recommend Pneumatic Routers although they may have
the required
HP. They are not able to accelerate the required RPM and will
tend to "drag''
and not melt the plastic of the fitting and container in order
for the molten plastic
to flow properly.
- Pigment in the plastic fitting will have little or no effect
on Spin Welding.
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