Why does flux core wire weld thicker metal than MIG?

[Shield Arc]

These were very slow going piles. We used a hydraulic vibrating hammer to drive them. No impact hammer at all. In the second picture I posted above the crane to the left of the derrick, the red one with a blue boom. Was gearing up to drill out the inside of the pipe. Here are the augers we used. The large hole saw looking auger really got a workout drilling through the rock. It was amazing how many carbide teeth we went through!:shocked: The Kelly bar was powered with a 750-HP diesel engine.

 

[Mark @ Everlast]

One reason is that most flux core is straight polarity.

 

[Oldpath05]

Why does the same machine setup with flux core wire weld thicker metal than the same machine set up as MIG? My Lincoln SP170T owner's manual gives a chart that shows flux wire welding a noticeably thicker steel than just MIG wire with shielding gas. I don't understand this.

(Why does flux core wire weld thicker metal than MIG?)> False ?, On some welding equipment, the heat input doesn't go high enough for the same size wire, .045 70s3 requires more heat vs. .045 71T Duel shield flux core wire when using the same shielding gas 75/25, there for both wire's can weld the same size plate.
Side note, 101 TM Duel shield flux core wire is not allowed on some steel stricture on some US Navy ships. Lincoln La 100, or Esab 100s, solid wire with 95/5 shielding gas must be used.

 

[yomax4]

It takes fewer volts to liquidate cored wire as opposed to solid. You just have the thin metal sheath outer with powder core.. The smaller machines like the 115v can only get away with 035 wire if its cored. 20 years ago the 71T1 dual shielded wires were supposed to be a direct replacement for 7018 stick. In most cases now days that's true. Most heavy plate ag and military have evolved over to either dual shield, metal core or hard wire pulse. You can use 3/32 cored wire to do heavy plate or hard surfacing but it would be difficult to run a 3/32 solid wire.

 

[Oldpath05]

I went through another 10lb.roll of .045, 71t duel shield today at work, mostly on vertical up and some flat, it sure welds better then that 71t self shielding wire flux core wire, I tried that stuff several times and could never get it to run smooth, awful spattery, I'd give it one star and wouldn't recommend it to a friend. But I would give 71t duel shield 5 stars, and recommend it to a friend if the friend could afford it, pricy. That's why for home use I mostly use 70s, .030.