Welding Process - Fimer TM 230 Manual De Instrucciones

9. SWITCH VOLTAGE
For safety reasons it is appropriate to man-
ually change the voltage of the machine
according to the points described below:
1. The voltage selector
switch is set to 230V.
2. Remove the voltage
selector switch.
3. The shows the recor-
ding of 220V.
4. Remove the Interlock
tension-change and turn.
5. Insert the Interlock ten-
sion-change which, in this
case, will show the incision
of 380V.
6. Insert the switch.
7. The machine is ready for
use with a voltage of 400V.

10. WELDING PROCESS

In MIG welding, a metal electrode consisting of
a wire is melted in a weld pool. The wire elec-
trode is continuously fed by a welding torch at a
constant and controlled speed. The torch is con-
nected to the positive pole, while the ground
cable is connected to the negative pole. As the
wire is fed, it touches the piece to weld and an
electric arc is produced.
The arc melts the wire, which is then deposited
on the workpiece. MIG welding uses a special
metallic wire as an electrode and inert gas
(CO2, CO2/Argon, Pure Argon) as a protection
for the weld pool.
12
Welding with continuous feeding of the wire
allows using a higher current density than that
used in welding with coated electrodes. This
increases weld penetration and reduces the
number of passes required to fill the joint.
The TM 230 and TM260 welding machines
have 10 adjustable welding current positions
the TM300, TM 350,TM 320W e
in Fig. 1),
TM360W welding machines have 20 adjustable
welding current positions (16 and 17 in Fig. 1)
the TM420W e TM500W welding machines
have 30 adjustable welding current positions
(16 and 17 in Fig. 1)
machines have 21 adjustable welding current
positions (16 and 17 in Fig. 1) ; the choice of the
best current depends on the thickness of the
piece to be welded. Refer to the table below for
setting the correct welding current.
WORKPIECE WIRE
THICKNESS DIAMETER
mm mm
0.8 - 1.0 0.6 - 0.8
1.5 - 2.0 0.8 - 1.0
2.0 - 3.0 1.0 - 1.2
3.0 - 4.0 1.2 - 1.6
> 4.0 1
> 4.0 1.2
> 4.0 1.6
11. HOW TO ACHIEVE THE BEST
WELDING RESULTS
1. Hold the torch at an angle of 45° from the work-
piece. Keep the gas nozzle (Fig. 4A) at a distance
of approximately 6 mm from the workpiece.
2. Move the torch with a continuous movement,
using a push, not pull, motion. This will guaran-
tee the gaseous shield of the arc.
3. Avoid welding in high winds.If the wind is too
strong it could carry the gas away from the weld-
ing pool, creating a porous (weak) weld.
4. Keep the wire clean: never use rusty wire.
5. Make sure the torch cable is free of dents or
coils, which could compromise the correct move-
ment of the wire.
6. When changing the wire spool, always clean
the wire feed tube with compressed air.
12. ADJUSTING THE WELDER
Once the welding tension has been set,
maintain the length of the electric arc between
5 and 10 mm and adjust the wire speed to
achieve the best welding results. Initially,
carry out a welding test on a well-cleaned
sample, free of any coating, rust or paint.
NOTE The torch trigger controls the following func-
tions:
- gas flow
- wire movement
- welding current
the TM650W welding
,
WELDING
ARC
CURRENT
A
60 - 100 Short - Arc
80 - 120 Short - Arc
100 - 130 Short - Arc
120 - 200 Short - Arc
150 ÷ 200 Spray - Arc
200 ÷ 300 Spray - Arc
300 ÷ 400 Spray - Arc
(16
,