Optional (Use With Cored Wire); Welding Aluminium; Welding Stainless Steel; Basic Information Regarding Mig Welding - Air Liquide CEMONT MAXISTAR 250T Instruction De Securite D'emploi Et D'entretien

2
3
4
280T
1. Euro torch connector.
2. Machine overheating indicator lamp.
3. Power button.
4. Welding tension regulation commutator.
5. Earth cable.
A Spot welding time control potentiometer.
B Control potentiometer to regulate time during which welding
power is maintained after the relative shutdown signal.
C Wire feed motor acceleration time control potentiometer.
D Wire feed speed control potentiometer.
4.0

OPTIONAL (USE WITH CORED WIRE)

Your welding machine (If ordered with the optional) can use the
special core wire Ø 0.9 which does not require the use of protec-
tion gas. Unlike electrode welding, this wire does not leave scale
and offers greater bead penetration with considerably lower ab-
sorption from the line.
Make sure you use proper welding polarity:
"POLARITY CHANGEOVER" NO GAS
Picture 2.
USE WITH WIRE AND PROTECTIVE GAS FOR WELDING
MILD STEEL.
"POLARITY CHANGEOVER" GAS
OPTIONAL (USE WITH CORED WIRE)
1
A
B
C
D
4 EN
Picture 3.
Either CO2 or Argon /CO2 (Mix) can be used as protective gases.
4.1

WELDING ALUMINIUM

Set the welder up for welding mild steel, with the following varia-
tions:
1. Use the cylinder containing pure Argon.
2. Mount a reel of Ø 0.8 mm aluminium wire.
3. Mount the Ø1 mm contact spout.
4.2

WELDING STAINLESS STEEL

Set the welder up for welding mild steel, with the following varia-
tions:
1. Use the cylinder containing Argon/CO2.
2. Mount a reel of max. Ø 0.8 mm stainless steel wire.
5.0 BASIC INFORMATION REGARDING MIG

WELDING

MIG WELDING PRINCIPLES
MIG welding is autogenous, i.e. it permits welding of pieces made
of the same metal (mild steel, stainless steel, aluminium) by fu-
sion, while granting both physical and mechanical continuity. The
heat required for melting is generated by an electric arc that
strikes between the wire (electrode) and the piece to be welded.
A shield gas protects both the arc and the molten metal from the
atmosphere.
6.0 CONNECTION AND PREPARATION OF
EQUIPMENT FOR WELDING
CONNECT WELDING ACCESSORIES CAREFULLY TO AVOID
POWER LOSS OR LEAKAGE OF DANGEROUS GASES.
CAREFULLY FOLLOW THE SAFETY STANDARDS
N.B. DO NOT ADJUST SWITCHES DURING WELDING OPER-
ATIONS TO AVOID DAMAGE TO THE EQUIPMENT.
CHECK THAT GAS IS DELIVERED FROM THE NOZZLE AND
ADJUST FLOW BY MEANS OF THE PRESSURE REDUCER
VALVE.
CAUTION: SCREEN GAS FLOW WHEN OPERATING IN OUT-
DOOR OR VENTILATED SITES; WELDING OPERATIONS
MAY NOT BE PROTECTED DUE TO DISPERSION OF INERT
SHIELDING GASES.
6.1 WELDING
1. Open the gas cylinder and regulate gas outlet flow as re-
quired. Fit the earth clamp on a part of the welding piece with-
out any paint, plastic or rust.
2. Select the welding current by means of switches (Ref. 4 - Pic-
ture 1 Page 3.) ; bear in mind that the greater the welding
thickness, the more power is required. The first switch setting
is suitable for minimum thickness welding.Also take into ac-
count that each setting features a specific wire drive speed
EN