Welding
1. Spot electric-welding
(Punch welding)
It is the most common way of welding grills: the electric circuit
that heats and, consequently, unites the parts closes by means of
two copper electrodes placed vertically one opposite the other.
Despite being inexpensive, this welding process is extremely reliable,
produces highly resistant parts and causes very limited rejections.
2. Pliers-welding
It is the logical outcome of spot-welding and it is used when the
two parts to be united are not on the same vertical axis (considering
the shape of grills), but on the same horizontal plane.
3. Arc-welding (Wire
welding)
With this welding process, it is the electric current that generates
the heat necessary to fuse the metal that will form the welded part
by turning into heat in the electric arc. This process produces
highly resistant welded parts.
4. Resistance-welding
(Head welding)
When the electric current goes through a metal-circuit, it encounters
a resistance that makes part of the electric current turn into heat
(Joule effect). Heating the ends of the parts to be united until
they get soft and applying an adequate pressure, the welding process
will be completed. This welding process, which can be considered
as the less expensive alternative to arc-welding, makes it possible
to unite two parts on the same plane with no projections.