Mig/Mag Welding - Praxair MIG COMPACT-220H/2R Guide De L'utilisateur

MIG COMPACT 220H/2R / 250H/2R / 290H/2R / 300H/4R / 350H/4R / 400H/4R
f) Use the welding equipment only in jobs that are according to the equipment characteristics.
6. Using WELDING or GAS CUTTING equipment.
a) The operator of welding or gas cutting equipments must know the specific characteristics and the correct form of use.
b) The pressures ought to be according to the manufacture recommendations.
c) The welding torches, hoses and reducers must be kept well tightened with no leaks, cleaned and free from oils or lubricant greases.
d) The pressure reducers can not be submitted to sudden changes of pressure and must be used according to the manufacturer specifications.
Do not use an installation without being equipped with proper retention valves.
e) Periodical checks must be made to the installation for detection possible gas leaks or other defects. Qualified personnel must execute the
maintenance operations.
7. Handling of Gas Tubes
The user must know and follow the safety instructions for stocking, use and transportation of compressed, liquefied and dissolved gases
under pressure used in welding or cutting operations.
Besides the specified norms must follow those that concern the kind of welding process to be used (Electrode, Tig, Mig, Plasma,
Plasmacutting, Laser, etc.), as well as the specific characteristics of the equipment, the power supply conditions, hygiene norms and safety at
work and the machine's safety regulations . The fulfilment of this safety norms, does not guarantee that the content is enough for all cases or
conditions, or invalids the fulfilment of current legal norms.
2 –Mig/Mag Welding
These semi-automatic arc welding machines under shield gas use inert gases like argon and mixed argon (MIG process -
Metal Inert Gas) or active gases as CO2 (MAG process - Metal Active Gas).
WELDING METAL
Carbon steel
Stainless steel
Al Si (aluminium/silicon)
Al Mg (aluminium/magnesium)
CuSi (copper/silicon)
Comparing with CO2, mixed Ar+CO2 has the advantage of increasing more stability to the welding arc with low spatters and a
better finishing of the welding pool. There are other gas moistures from helium to increase penetration or oxygen, etc for
specialized welding jobs. For these jobs, a consult to gas producers is advised.
CO2 seam
(earth plug nr. 1)
2 inductance positions
220 / 250 / 290 / 300
4
100% CO2 (Carbon dioxide)
80% Ár (Argon) + 20% CO2
85% Ar +15% CO2
98% Ar + 2% CO2
95% Ar + 5% CO2
100% Ar
100% Ar
85% Ar + 15% He (Hélio)
Argon/CO2 seam
(penetration – earth Plug nr.2)
SHIELD GAS
Argon/CO2 seam
(filling – earth Plug nr. 3)
3 inductance positions 350 / 400