The process may employ direct current with positive or negative electrode or alternating current.In general,AC is preferred for welding aluminum and magnesium.Direct current electrode negative is preferred for welding most other materials and for automatic welding of thick aluminum.Thin magnesium Sometimes is welded with direct current electrode positive.
Gas tungsten arc welding is generally more expensive than SMAW due to the inert gas,and is only 10to20 percent as fast as GMAW.However,GTAW will provide the highest quality root pass,while accommodating a wider range of thicknsses,positions,and geometries than either SMAW or GMAW.
Type |
Model |
Added Imprrity |
Impurity Quantity |
Other Impurities |
Colors Sign |
Thoriated Tungsten |
WT10 |
ThO2 |
0.9-1.2 |
<0.20 |
Yellow |
WT20 |
ThO2 |
1.8-2.2 |
<0.20 |
Red |
WT30 |
ThO2 |
2.8-3.2 |
<0.20 |
Purple |
WT40 |
ThO2 |
3.8-4.2 |
<0.20 |
Orange |
Cerium Tungsten |
WC20 |
CeO2 |
1.8-2.2 |
<0.20 |
Grey |
Lanthanated Tungsten |
WL10 |
La2O3 |
0.8-1.2 |
<0.20 |
Black |
WL15 |
La2O3 |
1.3-1.7 |
<0.20 |
Golden yellow |
WL20 |
La2O3 |
1.8-2.2 |
<0.20 |
Sky blue |
Pure Tungsten |
WP |
Colors Electric Discharged Power: 4.5 |
|
<0.10 |
Green |
Product Information: |
TIG:1.0-12mm |
Length: 50mm,75mm,150mm,175mm |