It almost looks like they are pinned on. I really can't tell but see no evidence of a weld.
CR- Yes, you can shoot them without a problem unless they were seriously out of whack. Usually, they are just off by a visible but small amount. I don't even bother to hand straighten them. In fact, one pair is off by a small amount on my short riser but dead straight when put on my long riser. It just had to do with loose manufacturing tolerances, IMO.
To really get a great bow, try to find a hard plastic #2 grip that was made for the Polar compound. It's a perfect fit on the 76er risers and is the finest grip I've wrapped my hand around. However, I have small hands.
Joe