[TheForge] Axial spray Metal Transfer (spray arc)

[Kenny O.]

There are three different  chemical behaviors when doing GMAW

Inert

Reducing

Oxidizing

Axial Spray requires and wants O2 to produce the heat,  without the O2 
the heat is limited.
So, this requires an Oxidizing environment.

Inert and Reducing atmospheres will keep the O2 out which is the desired 
effect in order to
prevent superficial porosity (oxidation) but the heat can't be reached. 
Ar, He and N2 alone
and in combination create  Inert and Reducing conditions. This is used 
mostly in non ferrous
metals except for certain types of SS.

When using the axial spray technique it is important to use deoxidizing 
wire. Because of the major
presence of O2 there will be porosity under the surface which can not be 
seen by the eye
(only if you give a shatt).

process       |      WIRE DIA.    |      AMP RANGE   |   VOLT RANGE   
|     shielding gas
-------------------------------------------------------------------------------------------------------------------------
axial spray   |      0.030            |        115 - 200        
|         15 - 27          |      75% Ar + 25%CO2
                             |   
--------------------------|---------------------------------|-------------------------------|        

                             |       0.035           |         165 - 
300       |         18 - 32          |       98%Ar + 2%O2     
                             
|----------------------------|----------------------------------|-------------------------------|
                             |       0.045           |         200 - 
450         |         20 - 34         |


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