I'm going to weld a torque tab to my outboard skeg to combat excessive steering torque, I have never welded on a outboard. I would like to get a little feedback/advice from someone who has. Is the metal cast aluminum? Since the tab goes to the back edge of the skeg top to bottom do I need to worry about radiant heat at the top destroying my prop shaft seal? Should I preheat the metal?

I have several options but I will most likely tig weld it, what amperage range should I be looking at? I have all the miller weld calculators but they cannot cover everything. I'd rather ask someone who knows.