7. Instructions for Welding H Material Belts
6. Instructions for Welding Narrow Belts
The FBW models 301, 721 and 1061 can be used to weld narrow belts from 150 mm, by using double-sided tape
and without assembling the Crossbars. Observe the following rules:
a. Use good quality tape and make sure it is thoroughly adhered to the Pliers.
b. When welding reinforced belts, work upside down with the fabric facing upwards.
c. If the belt still moves while welding, raise the welding temperature by 15°C to 20°C to allow an easier melting of
the material and reduce the pressure required. When you finish, return the Temperature Controller to 220° C.
The procedures for welding M and H family materials are basically the same. However when welding H family belts
it is necessary to be extra careful. The following are specific areas to watch out for:
a. When welding H material belts, and especially belts 4 mm thick or more, in ambient conditions of low
temperature and high humidity, it is necessary to warm the belt ends before welding.
b. With the belt ends secured in the Pliers, use a Leister Hot Air Gun to direct hot air over the belts’ ends for
approximately 2 minutes.
c. Without delay continue with the standard welding procedures described above.
d. If you do not have a Leister Hot Air Gun, you can place the Welder in the Pliers over the Pliers supports. Close
the Pliers without bringing the belt ends into contact with the Welder at least for a minute. The heat from the
Welder will warm the belt ends before you begin to weld.
e. When you bring the belt ends in contact with the Welder, press gently until the two ends have an even melt
along the entire length of both sides of the Welder. At this point stop pressing and maintain this position for
approximately 20 seconds. This allows the heat from the Welder to penetrate farther into the “H” material providing
a sufficiently large softened area to ensure a good weld. Open the Pliers quickly and with a “snap”, which will
prevent material from sticking to the Welder.
Release pressure, remove the Welder continue with the standard welding procedures described above.
f. Using the Operating Handle, quickly close the pliers, because the H material cools down quickly. When working
with H material belts, especially those that are 4 mm or thicker, apply extra pressure when closing the belt. This is
needed to force any air bubbles out of the joint. However, remember that applying too much pressure will reduce
the quality of the weld by forcing all of the melted material out of the area of the joint and leaving only cold
material.
g. The splice must be left to cool for at least 10 minutes after welding. Checking the splice by bending it too soon
will weaken or break the splice.
h. Because of the care needed to ensure a quality weld, it is important to perform several trial welds before
welding a belt. This will allow you to get the feel for the pressure required while welding and closing the Pliers after
welding. If you still have problems, please contact Volta for aditional technical advice.
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