Don't believe everything you read.
Maybe it is just interpetation of "chemical weld".
When I think "weld" I think that the two surfaces are welded and bonded together to become one. That is simply not the case.
I can take
any joint apart and show you. I can't count the times that I have done this.....probably a hundred. Were they ALL bad joints?
You don't have to believe me but I am right
I started off in the trades in 1970 working with PVC and have installed miles of the stuff. I learned
quickly that a good joint had to be a tight fit. If the pipe was slightly undersized, you could put as much cement as you want on it and it still wouldn't hold.
Years later, in 1980, I met an engineer who explained how PVC joints were so strong and it all made sense. It's all about the tolerance.
Like I said, I have done miles of PVC, both plumbing and electrical and I have done a LOT of rework and repair. I gaurantee that I can take any PVC coupling apart and still leave a clean surface to reuse it. No grinding involved because the pipe/fittings do not fuse together like a metal weld.
If you are bored some day, give it a try. Find a piece of 2" that has been glued and set for however long. Use a sawsall to carefully slice thru the outer part (coupling or belled end). To make it REAL easy, do the same thing on the other side. Use a flat screwdriver and your linemans to chisel under the fitting/bell and it will pop off easily in maybe two or three pieces. No (or very little) fusing has taken place.
The PVC cement basically fills that small gap and creates the tight fit. Haven't you ever had undersized pipe before and no matter how long you let it sit, it will still pull apart? I have.....hundreds of times. It's especially troublesome when it's going into a light pole base
NOT something you want to come apart.