2.7 Connection of Shielding Gas System
2-11
HW0480311
HW0480311
3.
Quality of Gas for Welding
Moisture or impurity in the carbon dioxide gas or argon gas used to shield welding arcs
adversely influenced welding. High purity and low moisture gas must be used.
Use MAG gas
containing 80 % argon and 20 % carbon dioxide gas for mixed gas.
The gas mixing ratio of MAG gas is content, which contributes to constant welding
quality. Especially for pulse welding, improper pulse welding will be resulted if the
argon gas ration is less than 80 %.
Use carbon dioxide gas
designated as "for welding" or what conforms to Class 3
specified in JIS-K1106 (moisture content 0.005 % or less) or the equivalent. Avoid
using carbon dioxide gas containing moisture more than 0.005 %, not only for the
adverse effect on welding, but also because it may cause clogging in the gas regulator
if the water content freezes.
4.
Gas Regulator with Flow Meter
Use gas regulator with flow meter suitable for the gas to be used. The following table
show the examples of the gas regulator.
*1
The power supply for the heater is not provided with the welding source. Prepare a 100
VAC power supply for the heater of the gas regulator.
Table. 2 Gas Regulator with Flow Meter
No.
Type
Applicable Gas
Remarks
1
FCR-2505A
CO
2
, MAG
Meter: Indicates secondary pressure
and flow amount
Heater: 100 VAC*
1
, 190 W
2
FCR-225
CO
2
, MAG, Ar
Meter: Indicates primary pressure and
float-type flow amount
Heater: 100 VAC*
1
, 190 W
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