I am not a professional welder;however,30 years ago I learned to weld at the local community college where I taught.Two nights a week and three years later I passed their tests. The instructors were from the Norfolk Naval Shipyard and the school there was very technical(not the college one)and was upgraded by the navy after the submarine disaster in the 60's.Later, I taught Physics at the yard,but did not have the clearance to see the advanced welding school.But,I could watch welding on ships.Heater bars were placed on either side of the weld(I do not know the temperature) and low hydrogen rods were used-7018.I used 6010 for rough work and 7018 for clean steel.I then had a side business doing repair welding.From what I learned from teaching at other shipyards, hydrogen was the enemy as it will invade the crystal structure of steel and cause cracking.This is just a comment as I am not qualified in metals technology.
