The welding of joins is necessary to prevent any
penetration of water after the vinyl floorcovering has been laid.
Hot welding with
weld rod:
Hot welding provides a homogeneous fusion between the two
edges of the join. The weld is carried out with the combined aid of a hot air
gun and a matching weld rod made of the same type of material as the
covering.
It ensures a permanent seal and a longer life for the
floorcovering.
Note: tiles are always laid with close butt jointing.
Sheets are usually laid overlapping and re-cut or occasionally
edge-to-edge.
When should hot welding be used?
Hot
welding is recommended for all sheet products and also tile products, which are
installed as a conductive installation. It is also worth considering when
installing tiles over heated floors.
In order to obtain a good result, it is
essential to allow at least 48 hours after installation to allow for the
adhesive to dry prior to commencing welding.
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Groove
cutting:
The groove must be cut with a “U” shaped cutter to
ensure the best possible contact between the weld rod and the covering (this can
be achieved with an electric router or a hand grooving tool).
Ensure the
groove is clean and free from any cutting debris.
The depth of the groove
depends on the thickness and type of covering to be welded and the diameter of
the weld rod to be used, but it should never exceed half the diameter of the
weld rod or 2/3 the thickness of the covering.
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Hot
welding:
The temperature must be adjusted to the type of
covering and weld rod. Adjustment of the temperature and the speed of welding
are required, prior to commencing (practice on an off cut of the covering) Pay
attention to the reaction of the weld rod, as the temperature, speed of movement
and the pressure applied will all play a vital part in successfully completing
this procedure.
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Trimming levelling the
weld: (with the surface of the covering)
Measure and cut the
width of the stair plus 5 cm down the length of the roll and store flat.
Make
a reference mark in pencil on the reverse of the vinyl in order to position the
ribbing on each of the stairs uniformly.
The storage temperature
must be at least 18°C for 24 hours. As far as possible, try to maintain the same
temperature in the stairway. Gently heating the material with a hot air gun at
the nosing detail will greatly assist with the installation at this
location.
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Hot welding is obligatory in the following
cases:
To weld
vinyl resilient floors, use a Tarkett recommended PVC weld rod.
To weld
Linoleum resilient floors, use Tarkett Linoleum weld rod. (not PVC)
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Troubleshooting:
The weld rod
is not well fixed in the joint:
Temperature is too high or too low.
Downward pressure too light. Welding speed too fast.
Eliminate
poor welding:
Adjust the temperature of the gun and practice on an
off-cut of the covering.
Weld the joint paying attention to temperature,
pressure and speed.
The weld rod has failed to fully weld the
joint:
Varying speed of movement when welding with the hot air gun
(too fast).
Remove the loose sections and commence welding again starting and
finishing at a sound section.
The covering is burnt or shiny on
either side of the joint:
Welding temperature too high or welding
speed too low or incorrect angle of the hot air gun.
After
levelling, the filler stands proud or is curved inward or is
hollow:
Trimming level was not carried out in two
stages.
Trimming level was carried out too son (weld rod was too hot). The
groove was too deep.
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Cold liquid welding:
Cold liquid welding
can be carried out 24 hours after laying a vinyl floorcovering.
The joints must be overlapping:
The joint can then
be prepared by using a straightedge and a sharp knife to cut along the overlap,
through both thicknesses at once. This should result in an extremely tight butt
joint.
Note: After edge-to-edge laying, only a hot weld procedure can be
used.
Cold
weld
Inject the Tarkett V1008 cold welding liquid into the full
thickness of the joint in a single even application and layer. One of the wings
of the nozzle serves as a guide when placed into the joint.
Note: Do not
remove any excess cold weld. It will disappear during normal wear. The
floorcovering should be left undisturbed for 24 hours after cold
welding.
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