[NinJim]

Agreed, ugly weld with NO penetration. Yuk...
That's one to take back to the dealer. If they won't help, try this.

Pull the plastic so a welder can get to it. Take the bike to the weld shop and have it tack welded in several spots. Return home, pull the pipes off and return them to the weld shop. They will re-weld the joint; then reinstall and go.

This is the cheapest way to do it; and you'll learn something new. If you lived close to me, I'd do it for you. Gratis...

Being it's your race bike, get it fixed now. I tech a lot at the Miller Track, and wouldn't pass it for racing, but OK for practice. You don't want to be running around trying to find a welder on the weekend that you paid a lot of money to do something fun.

Now, go get you hands dirty,
Cheers,

PS: If this was your main ride, you could go to the auto-parts store and get some exhaust pipe wrap. It will keep you on the road until a time window opens for a proper repair.