I was so surprised. The gas forge is almost perfect. I took it to blacksmith workshop and my friends were also really happy about the price/quality ratio. I would 100% recommend and buy again.
For welding temperature it must be placed inside and some kind of door must be used on both sides to keep all the heat inside the forge. Without the door and with a little breeze the max temperature is about 1000°C.
10kg PB bottle lasts about 10 hours with one burner.