GYS UNIMIG 200-4 Mode D'emploi page 12

posititioned correctly - so that the writing that states "0.6mm" is visible when in place.
For Steel or Stainless Steel, you will need to use specific gas - Argon + CO2 (Ar + CO2). The proportion of CO2 will vary depending on usage. The
gas flow in steel is between 8 and 12L / min depending on the environment and experience of the welder. For the specific requirements, seek advice
from your gas distributor.
SEMI-AUTOMATIC WELDING FOR ALUMINIUM (MIG MODE) (FIG 3-B)
The UNIMIG 200-4 can weld 0.8mm and 1.0mm aluminium wire.
The UNIMIG 250-4 can weld 1mm and 1.2mm aluminium wire.
To weld aluminium, neutral gas "pure argon" (AR) is required. When choosing gas seek advice from your gas distributor. The gas flow in aluminium
should be between 15 and 25 L / min depending on the environment and experience of the welder.
Things to note when welding with Aluminium
• When welding aluminium use a special aluminium torch with Teflon sheath to reduce friction.
Do not cut the sheath near the connector! It is used to guide the wire from the rollers.
• Set the drive rollers of the wire feeder to minimum pressure so as not to pinch the wire
• Remove the capillary tube before connecting the aluminium torch
• Contact Tips: Use a specific Aluminium contact tip corresponding to the diameter of the wire.
SEMI-AUTOMATIC BRAZING FOR HIGH-TENSILE STRENGTH STEELS (MIG MODE)
The UNIMIG 200-4 are recommended by car manufacturers to braze-weld high-tensile strength plates with a cuprosilicium CusI3 wire or cuproaluminium
CuAl8 wire (Ø 0.8 mm and Ø 1 mm). The welder must use a neutral gas: pure argon (Ar). For specific gas requirements, seek advice from your gas
distributor. The gas flow required is between 15 and 25 L / min.
GAS COUPLING (FIG 4)
Screw the regulator/flowmeter onto the gas bottle (1). To avoid gas leaks, use the collars provided in the accessories box.
Maximum gas pressure : 0.5 MPa (5 bars).
REEL AND TORCH ASSEMBLY (FIG 4)
• Open the door of the machine.
• Place the reel on the drive pin (3) of the reel support
• Adjust the reel brake (4) to avoid reel movement tangling the wire when the welding stops. Be careful not to tighten too much - the reel must
rotate without straining the motor.
• The wire rollers are double-grooved (9) (Ø 0.6/ Ø 0.8, Ø 0.8/ Ø 1, Ø 1/ Ø 1.2). The visible diameter indicated on the roller when fitted is the diameter
currently in use. For Ø 0.8 wire, use the Ø 0.8 groove.
• Before use:
- Release the fixing screw of the wire guide (8)
- Place the rollers
- Then place the wire guide (7) as close as possible to the roller but without touching it, then tighten the fixing screw.
• To set the adjustment knob of the drive rollers (6), proceed as follows: loosen the knob fully, start the motor by pressing the torch trigger, tighten
the adjustment knob whilst pressing the trigger. Bend the wire where it comes out of the nozzle and hold it in place to stop its progress. The setting
is correct when the guide roller slides over the wire even when it is blocked at the end of the torch. A common adjustment is the rollers command (6)
on the scale 3 for steel and 2 for aluminum.
CHOICE OF REELS
Possible settings :
Type fil
Steel
Stainless steel
Alu
AG5
SETTINGS PANEL (FIG 5)
10 - Welding mode selection
• NORMAL (2T): standard two-stage welding
• NORMAL (4T): standard four-stage welding
• DELAY: intermittent welding modes for optimised operating procedure.
• SPOT : Spot welding with adjustable spot diameter
11 - Wire speed selector
Wire speed regulator.
The speed varies from 1 to 15 m/minute.
12 - SPOT potentiometer
12
UNIMIG 200-4 / 250-4
Weight (kg)
Ø 300 15
Ø 200 5
Ø 200 5
Ø 300 7
Ø 200 2
*Make sure to have a teflon torch liner/contact tip for alu. Remove the capillary tube.
Ø Fil (mm)
0.6 / 0.8 / 1.0 / 1.2
0.6 / 0.8 / 1.0
0.8
1.0 / 1.2
0.8 / 1.0 / 1.2
13 - Manual Mode
In manual mode, the wire speed is determinated by the user by adjus-
ting the potentiometer (11).
14 - Synergic Mode
Position the potentiometer (11) in the middle of the « OPTIMAL SYNER-
GIC » zone
In this mode, the device determines the optimum wire speed according
to 3 parameters:
• Voltage
• Wire diameter
• The power mode
The wire speed is adjustable + / -.
EN
Torch Gas
x
Argon
+
x
CO2
x
x*
Pure argon
x*