17
We have designed this machine so as to reduce the
amount of maintenance required to a minimum. Despite this,
to keep the machine in perfect working order, you will need
to arrange for a small amount of basic maintenance.
NOTE:
Only trained personnel are permitted to work inside
the machine.
BEFORE OPENING THE MACHINE, CUT OFF ITS
ELECTRICAL POWER BY REMOVING THE PLUG FROM
THE MAINS SUPPLY SOCKET.
If the machine has just been turned off after a long working
period, some of its internal parts may be overheated. Be
also careful as the condensers of the cards may still be
loaded. So do not touch the internal parts of the machine.
Every six months, open the machine and clean it inside,
using compressed dehumidified air.
CAUTION. DO NOT USE COMPRESSED AIR AT TOO
HIGH A PRESSURE. YOU COULD DAMAGE THE
ELECTRONIC COMPONENTS.
Check the welding cables and the power supply cable with
the same regularity; clean and tighten any welding
connections that have become loose.
Make sure the fan is not locked or that there are no
elements that increase friction when it rotates.
For cleaning the body do not use liquid solvents that may
corrode the adhesive labels, plastic and rubber.
No modification, of any type, may be made to the welding
machine.
MIG/MAG welding
In the international symbology the continuously fed wire
welding is defined as follows:
Continuously fed wire welding under inert gas shielding
(MIG – Metal Inert Gas)
Continuously fed wire welding under active gas shielding
(MAG – Metal Active Gas)
Continuously fed cored wire welding under inert or active
gas shielding (FCAW – Flux Cored Arc Welding)
This type of welding is characterized by the melting of a
deposited metal (continuously fed wire) in a protected
atmosphere (gas). Both the wire and the gas are conducted
by a torch connected to a d.c. power generator. Usually the
positive polarity is given to the wire; the melting electric
energy is given off between the wire end and the work
piece to be welded. The power generator provides a wide
range of working tension values so as to meet all the needs
required by this welding system. The wire should be
continuously fed so as to supply the weld metal to the
welding process. According to the aims, it is possible to
regulate the welding parameters so as to allow the wire to
be melted in different ways:
SHORT-ARC method. Each droplet touches the weld pool
before getting detached and short circuits the power supply:
the wire melts and breaks off to restart the cycle.
SPRAY-ARC method. Droplets are transferred to the weld
pool across the arc.
SHORT-ARC technique is generally used to weld thin sheet
metals, the bottom of calking tools and joints in non-flat
position. SPRAY-ARC technique is used to weld thick-
gauge work pieces and to obtain high penetrations.
When the continuously fed wire welding is selected, the
operator is recommended to regulate the welding
parameters so as to obtain good results according to the
requirements: the welding tension, which primarily affects
the bead appearance, and the wire-feed speed which
depends on the welding current.
The working feature in relation to the welding parameters is
shown in the following drawing:
Synergy:
By synergy we mean a simple and fast way to regulate the
generator. Through this function, an optimum balancing of
all the welding parameters in every position can be granted,
thus helping the user. This is the reason why the synergic
curves of most of the wire types have been introduced,
however these curves can be easily modified so as to allow
the user to optimise his own welding procedure.
Gas shielding:
The MIG-MAG welding mode depends mainly on the type
of gas used, which is chosen according to the type of
material and joint to be welded:
CARBON DIOXIDE
CO2: this shielding gas provides high travel speed and high
penetrations. The weld offers good mechanical properties
at low costs. The use of CO2 increases spatters and
porosity caused by the carbon monoxide, and problems
related to the chemical composition of the joint with the
addition of carbon and loss of oxidative elements. It should
also be remembered that the CO2 contained in the
cylinders is at a liquid-gaseous state and it becomes gas
only when is given off. This means that the cylinder should
be used carefully and suitably heated before gas is given
off.
ARGON
Argon provides a low arc tension and excellent arc stability.
As this type of gas is heavier than the air it tends to remain
on the weld pool. Argon is used for welding in position of
light alloys or thin-gauge materials.
HELIUM
Helium provides high penetration and high feeding speeds
with a high arc tension. This is a volatile gas with high
operating costs; it is used for welding very thick-gauge work
pieces and on automatic applications.
ARGON-HELIUM MIXTURE
Argon is mixed with helium to obtain the advantages of both
gases. Argon provides good arc stability while helium
promotes high penetration and travel speed.
ARGON-OXYGEN 2% MIXTURE
This mixture is often used for welding Cr-Ni stainless steels
as it provides good arc stability and a better weld bead
appearance.
ARGON-CO2 AND ARGON-CO2-OXYGEN MIXTURE
These mixtures consist of a percentage of argon ranging
from 70% to 90%. This provides good arc stability and
Summary of Contents for XuperMIG-2500
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