VEVOR Leveling Casters, Set of 4, 1000 kg Total Load Capacity, 63.5 mm, Heavy Duty with Upgraded Handle Design, 360 Degree Swivel Caster Wheels, Adjustable Casters with Feet for Workbench, Machine

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Yes, you can weld it.

Think of it this as the entire weight sits on the metal platform and the screws stop the wheel from slipping out of position. The screws are not load bearing. In fact, the steel platform is very sturdy and if you want to you can grind and then weld it to a frame.