Exhaust system question

[SharkPilot]

Last night during a full throttle blast my exhaust suddenly got much louder. Looking ubderneath the car I saw that the resonator had moved aft far enough to slip off the head pipes that come from the converters. The whole exhaust sustem had moved far enough back to pull the pipes apart. A closer inspection found some rather sorry looking welding that had broken there. I was able to slip it all back together and use some bailing wire to keep in place to get home. The head pipes probably slip 1.5" into the front of the resonator.
My question: Should that be welded there or did the factory install clamps there? The FSM doesn't illustrate that with enough detail to tell. This is at the front of the resonator right behind the mount that's attached to the transmission.

Thanks everyone, SharkPilot