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Introduction |
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Eventually, after several design and application tests we are the first in Italy to introduce the new fastening system on decks for metal scaffolding with self-pierce rivet.
Using the new riveting system for assembling cauls, allows to perform reliable joints, characterised by a high dynamic and static resistance.
The assemblies obtained by the riveting system, are watertight and offer a very high integrity grade of the jointing.
Furthermore, rivet joints are more dynamically resistant than those obtained by spot welding and clinching.
The riveting system may be employed instead of conventional assembling systems, such as spot welding, bolting, blind riveting and clinching.
In order to apply this system, only two requirements have to be met:
1. There must be enough space on both sides of the cauls to be fastened in order to allow access to the riveting modulus.
2. The whole thickness and stiffness of cauls have to be within the limits allowed by this new special technology.
The main advantages of the riveting systems compared to spot welding are:
A. In the assembling process, cauls are not over-heated. Because the so-called annealing of cauls does not occur, it is easier to use the highly resistant steel cauls, that could alter due to the electro-thermal action.
B. It is suitable for jointing different materials.
C. It provides joints with a high fatigue-resistance.
D. No smokes, sparks or off-cuts are generated during the caul-jointing process.
E. It provides the joints with a high reliability.
Comparation
Spot welding
A. A thermal effect is induced in the fastening zone.
B. Harmful smokes for workers are produced.
C. Thickness changes are partially compensated.
D. Cauls made of different materials cannot be fastened.
E. Cauls with either the same or different thickness can be fastened.
Clinching
A. No thermal effect is induced in the fastening zone.
B. No harmful gas or vapours for workers are produced.
C. Cauls to be fastened do not need to be pre-treated; thereby polluting processes are avoided, such as degreasing o pickling.
D. Thickness changes are not compensated over the tolerances based on the DIN standard for cauls.
E. Cauls made of different materials cannot be fastened.
F. Cauls with either the same or different thickness can be fastened.
G. Watertight fastening. Clinching does not pierce the lower caul. Therefore it prevents air and moisture from entering, resisting thereby to corrosion.
Riveting
A. No thermal effect is induced in the fastening zone.
B. No harmful gas or vapours for workers are produced.
C. Cauls to be fastened do not need to be pre-treated; thereby polluting processes are avoided, such as degreasing o pickling.
D. Thickness changes are easily compensated over the tolerances based on the DIN standard for cauls.
E. Cauls made of different materials may be fastened.
F. Cauls with either the same or different thickness may be fastened.
G. Watertight fastening. Rivets do not pierce the lower caul. Therefore it prevents air and moisture from entering, resisting thereby to corrosion. |
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