VEVOR Rotary Welding Positioner 50KG, 0-90° Welding Positioning Turntable Table 0.5-6RPM 120W, with 12.4 Inch 3-Jaw Lathe Chuck & Welding Torch Stand Holder for Cutting, Grinding, Assembly, Testing

No, this one doesn’t have a center bore.

First, start the machine running, then slowly adjust the speed control knob to slow it down until the speed is almost at a standstill.

If there is a problem, you can describe it in detail, and the accessories can be replaced, but the entire control box cannot be replaced.

Based on the product information, it does not explicitly mention suitability for overhead welding applications. However, the turntable table can tilt from 0-90°, which may allow for some angled welding positions. For confirmation on overhead welding capability, it would be best to consult the manufacturer or experts.

Yes, its speed can be adjusted while in use. The product description states it offers 0.5-6 rpm stepless speed adjustment that can be easily controlled with the user-friendly control box.