If you use weld points for the jack where do you place the jack stands?
Short answer is I put the jack stands on user manual approved interior lift points.
In addition to the 4 pinch weld lift points, there are 4 interior lift points, see the manual. I never liked putting traditional Jack stands on pinch weld lift points. In my opinion, even with the small rubber caps (the condom type, not the hockey puck ones) there isn't enough surface area to distribute the load.
Recently purchased a new set of jack stands with a flat top and hard rubber hockey puck with slits for pinch welds and rated at 6000 lbs each. I purchased the new jack stands primarily for another vehicle, but plan to use them on the Volt too. If I use them on the Volt I will jack up on interior lift points (again, see manual), then put these jack stands on the pinch welds. To lift from the interior points you have to have a low profile long reach hydraulic jack.
One interesting thing I learned along the way, jack stands sold as pairs have a load rating. And as I understand it, that load rating is for the pair. So in other words if you buy a pair of 2 ton jack stands, each stand is rated at 1 ton.