Guys.. lets step back here before everybody gets confused.
IPS is a manufacturer of Solvent Cements, just like Oatey and other companies.
IPS makes a broad product line that includes solvent cements designed for everything from acrylic, to lexan, to PVC. Weld-on is a line of products made by IPS. Each product is a different compound. The Weld-on #3 is for acrylic and is not AT ALL the same product as Weld-on #700 PVC cement. They CAN NOT be interchanged.
The OPS questions was not clear. He asked of "weld-on" could be used to glue PVC. That is like asking if Kool-Aid is cherry. Not all Weld-on can be used to glue PVC and not all Kool-aid is cherry.
Weld-on PVC cement is not readily available at most local stores. Oatey products are. So I suspect the OP is asking if it is okay to use Weld-on acrylic cement (#3, #4, #16, etc) for PVC. The answer is NO. Unless you have Weld-on 700 Series PVC CEMENT, then you can not use it on your PVC plumbing.