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The topmost weld, near the shoulder, will cause the least amount of distortion.

The weld that goes down the side of the tubing will shrink, and pull like a bandit...…….UNLESS YOU DO AN IDENTICAL WELD ON THE OTHER SIDE OF THE TUBING, which, in this case, was doable due to the design. There's an identical piece welded on the other side of the tubing. But if there weren't...….the tubing would bow severely as the transverse weld shrinks. The weld on the other side pulls the metal in the opposite direction.....cancelling out the forces.

This is where flame straightening comes into play. Without that weld on the other side, you'd have to shrink the curve ya caused when it bows.