[jr_ss]

You really are concerned with nothing. You aren't going to loose anything by running it. I would say the pipe itself was slight out of round, than it warped when welded.

However, you're going to have warping issues when you weld, as the metal cools it contracts and pulls away from the heat source. If the flanges are true and flat, it's not a big deal. Relax, it's just a test pipe.