Check out this short video along with links to 30 second videos of several common welds and weld certification tests like 3G and 4G plates.
2f position 1/4" plate to box tube with dual shield
3f position 1/4" thick fillet using .035" lincoln 71m
3f fillet weld tee 3/8" thick using .045" dual-shield
4f tee joint 1/4" thickness dual-shield flux core
3g plate test dual-shield flux core root pass settings
3g fill passes settings for dual-shield fcaw-g
3g cover pass settings dual-shield flux core plate test
4g settings for dual-shield flux core test plate root pass
4g plate test settings dualshield fcaw-g fill passes
4g plate test dual-shield cover pass settings fcaw-g
dual shield settings for 6 inch schedule 80 pipe
Dual shield flux core is a trade name and is also called fcaw-g which stands for 'flux cored arc welding gas shielded"
Dual shield flux core excels for out of position welding like vertical uphill and overhead....especially when its not feasible to clean hot rolled mill scale before welding.
One lesser known useful tip for folks who do on site fabrication/installation is that dual shield is available in .035" diameter and can be used very effectively with small machines like the small portable lincoln powermig 210mp and the newer version 211 and 215 multi process machines.
Being able to weld in all positions without cleaning metal perfectly speeds up the work.
And being able to use generator power with a small inexpensive inverter welder opens up a lot of possibilities for small welding businesses.