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Tig Welding 4130 video on welding a 4130 chromoly flight control
Tig Welding 4130 video review - A quick summary of the videoIn this tig welding 4130 video, This guy is welding 4130 chromoly tubing to some sheet metal plates to make a flight control stick for a small aircraft.You can tell that He is pulsing the foot pedal because the tig welding arc gets brighter at the same time intervals. Pulsing the foot pedal like that is one way that some welders control heat input. I have seen also seen really good results without pulsing. Pulsing the arc with the foot pedal is just one way to control heat and keep the bead width and ripples uniform. Using a machine that has a pulse function on it is what most welders do. Some Old schoolers out there are still under the impression that 4130 chromoly is best welded with a gas welding oxy acetylene torch. Well thats the old way to do it, and it definitely works, but this guy knocks these welds out in jig time with a tig welder...and his welds look really good too. There is a whole bunch of Engineering data available on the web that endorses tig welding chromoly with no preheat or post heat stress relieve treatment. As long as the tubing is under a certain thickness , it can be tig welded with E70S2 filler without problems. I know one thing....I would rather tig weld it than gas weld it anyday. 
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