Protective Gas Quantity Setting; Electrode Welding (Mma) - CEA MATRIX X220 AC/DC Operator's Manual

Protective gas quantity setting

To set the quantity of gas for TIG welding, proceed as follows:
1) Slowly open the valve on the gas cylinder.
2) Start the welding machine by selecting position "I" on the power supply switch (Pos. 7, Fig. A).
Press the SET key, the default setting for which is "TEST GAS FLOW"
key is pushed again, the process stops before time.
3) Regulate the quantity of gas using the pressure reducer.
If the setting is too low or too high air can get into the welding puddle, resulting in the formation of porosity or oxidation.
At Ar gas 100% the internal diameter of the gas nozzle in mm generally corresponds to the gas flow in l/min.
Helium rich gas mixtures calls for a greater quantity of gas.
If necessary the quantity of gas used must be corrected, based on the table below:
Protective gas
Argon 100%
75% Ar / 25% He
50% Ar / 50% He
25% Ar / 75% He
100% He

Electrode welding (MMA)

The welding electrode is used to weld most metals (various types steel, etc.),for which rutilic and basic electrodes are used.
1) Connecting the welding cables (Fig. F):
Disconnect the machine from the mains power supply and connect the welding cables to the output terminals (Positive and Negati-
ve) of the welding machine, attaching them to the clamp and ground with the polarity specified for the type of electrode being used
(Fig.F). Always follow the electrode manufacturer's instructions. The welding cables must be as short as possible, they must be near
to one another, positioned at or near floor level. Do not touch the electrode clamp and the ground clamp simultaneously.
2) Switch the welding machine on by moving the power supply switch to I (Pos. 7, Fig. A).
3) Make the adjustments and select the parameters on the control panel (for further information see the control panel manual).
4) Carry out welding by moving the torch to the workpiece. Strike the arc (press the electrode quickly against the metal and then lift it)
to melt the electrode, the coating of which forms a protective residue. Then continue welding by moving the electrode from left to
right, inclining it by about 60° compared with the metal in relation to the direction of welding.
l/min = Ø mm internal diameter of the gas nozzle
Fig. F
10
to check the welding gas for a period of 15 sec. If this
Correction factor
1,15
1,40
1,80
> 2,50