I also weld the V groove as stated is the way as stated. Keeping everything straight is a concern. V groove one side 1/2 way through, fully weld other half top,bottom, and side to hold straight while while welding groove. Then other side can be ground out and welded. Hot metal in a v groove pulls hard as it cools. A good weld is stronger than the parent metal, but care has to be taken not to damage the parent metal on either side of the weld. Yes it can be tricky