Mig/Mag Welding; Manual Mode; Program Mode; Spot Welding - Fronius VARIOSTAR 357 Mode D'emploi

MIG/MAG WELDING

Caution! Before starting up for the first time, read the sections
headed "Safety rules" and "Starting to use the power source".
N.B.! Manufacturing tolerances and alloy tolerances of welding wires
may necessitate corrections to the welding voltage and/or wirefeed
speed. This is also true when other shielding-gas mixtures are used, and
in the event of mains voltage fluctuations.

MANUAL MODE

One of the basic preconditions for obtaining an optimum welding result
with the MIG/MAG welding process is that the operating point has been
determined correctly. This is basically effected by selecting mutually
compatible welding voltages (step switch
(wirefeed-speed dial ).
- Plug the earthing cable into welding-current socket 1 / 2 / 3
latch it in place
- Attach the other end of the earthing cable to the workpiece
- Plug the machine into the mains
- Shift the mains switch to the "I" position
- Shift the welding-program selector switch
position (Manual)
- Set the welding voltage with the coarse
- Set the wirefeed speed on the wirefeed-speed dial
- Shift the operating mode selector switch
- Open the gas-cylinder valve
- Set the gas flow-rate
- Press the torch trigger and start welding

PROGRAM MODE

In Program Mode - both in stand-by and during welding - the digital
displays show various parameters in the form of command values and
actual values. These greatly facilitate the settings procedure.
The following section describes the settings procedure for a given sheet
thickness. If other data - e.g. welding voltage, welding current or wirefeed
speed - are specified for this welding task, then the order in which the
settings are made must be altered in accordance with the procedure
given below.
- Plug the machine into the mains
- Shift the mains switch to the "I" position
- Shift the wire-diameter selector switch
- Shift the digital-indicator selector switch
position
- Correct the coarse and/or fine
the desired sheet thickness appears on the 'm/min - mm - A' digital
indic.
- Shift the digital-indicator selector switch
position - the 'm/min - mm - A' digital indicator then shows the pro-
grammed welding current
- Shift the digital-indicator selector switch
position - the 'm/min - mm - A' digital indicator then shows the pro-
grammed wirefeed speed
- If required, correct the programmed wirefeed speed with the wirefeed
speed dial (% scale, correction facility of +/- 30%)
- At the same time, the 'V - inductance' digital indicator
optimum welding-current socket 1 / 2 / 3 for this operating point, for a
period of 2 sec.
- Plug the earthing cable into welding-current socket 1 / 2 / 3
shown on the 'V - inductance' digital indicator
- Attach the other end of the earthing cable to the workpiece
- Shift the operating mode selector switch
- Open the gas-cylinder valve
- Set the gas flow-rate
- Press the torch trigger and start welding
All manuals and user guides at all-guides.com
, ) and wirefeed speeds
, and
to the "Manual Mode"
and fine step switches
into the required position
to the applicable value
to the sheet-thickness
step switch(es) up or down until
to the welding-current
to the wirefeed speed
shows the
(as
), and latch it in place
into the required position
15

SPOT WELDING

N.B.! For spot-welding, it is necessary to fit a spot-welding attachment
onto the torch first.
- Set the welding parameters
- Select the desired spot-welding time on the spot-welding time dial
- Shift the operating-mode selector switch
position
- Make sure that the torch is correctly tooled up (i.e. with spot-welding
attachment) and place it onto the metal sheet
- Press and release the torch trigger
- Automatic spot-welding sequence takes place
N.B.! To interrupt the spot-welding sequence, press and release the torch
trigger again.
The settings made are correct when the top of the spot-weld is slightly
convex and it can be seen on the underside of the spot-welded parts that
they have been welded through. Also, make sure that the parts to be spot-
welded are resting snugly against one another, and that any contamination
from e.g. paint and rust is removed first.

CARE AND MAINTENANCE

Warning! Before opening up the welding machine, switch it off,
unplug it from the mains and put up a warning sign to stop
anybody inadvertently switching it back on again. If necessary,
discharge the electrolytic capacitors.
In order to keep your welding machine operational for years to come, you
should observe the following points:
- Carry out safety inspections at the stipulated intervals (see the section
headed "Safety rules")
- Depending on the machine location, but no less often than twice a
year, remove the side panels from the machine and blow the inside of
the machine clean with dry, reduced-blow compressed air. Do not aim
air-jets at electronic components from too close a range.
- If a lot of dust has accumulated, clean the cooling-air ducts.
On water-cooled welding torches:
- Check that the torch connections are watertight
- Check the volume and quality of the coolant water (only top up with
clean coolant water)
- Keep an eye on the volume of coolant returning to the coolant
reservoir
to the spot-welding