welding frt flex pipe starting to crack, is part of cat convertor ?? on 1993 Volvo 240

where can i get this done, volvo sevice says they can't weld, would have to replace cat convertor

Asked by for the 1993 Volvo 240
The front pipe, or "Header Pipe" as Volvo refers to it is replaceable separately from the Catalytic Converter. It's common for these to leak and they need to be replaced if leaking.
Are they having a problem removing the header pipe from the cat? What exactly is going on here?