Dude, that's not even a weld, they never set it hot enough, never had the surface of the material form a pool for a bead! That is just weld meterial from the mig wire acting like "tape" on the surface. The tensile strength of a good mig weld should be in the 70,000 lb/sq inch area, I'd bet you could just about pull that one apart by hand!
Hell yeah, I'd take it back and make them WELD it for real, that is not a weld! This is what I consider a crappy weld, but I was too lazy to take the tires off and had a hard time reaching properly, plus it didn't need to "seal" like an exhaust weld should. And it's 100x better than the one you paid for...



And this is what a decent mig weld should look like:

 

take it back they didn't even frikin grind it. Seriously was like welded by a dyslexic 5 year old. I'm a self taught welder, first time i picked up a stick i had never really seen it done and i did a better job than that.

 

Um, that is the worst weld ever....EVER. Take it back.

 

well looks like im going back after work tomorrow

 

Please, please don't tell me you had that work done somewhere around Ft. Stewart. Vidalia through Reidsville to about Hinesville were my stomping grounds for about 15 years. I know no local shop in that area woulda done work like that!!!

 

omg...seriously? Your exhaust has some serious tumors on it. That is straight up embarrassing. Whoever welded that has no ***** and should be fired.

 

That poor truck

 

i dont even have a steady arm when welding and even i will say my work is like some picasso stuff compared to that 2 year old slop.

 

Doc might be able to give you prescription for those bumps.Worst welding job ever.

 

I was thinking that maybe you could guilt them into installing a y-pipe for you or something, but after thinking about it you might not want them touching any other parts of your truck.