Cebora 280 TIG Sound DC 250 ST HF is a welding machine that uses INVERTER technology to generate constant direct current. It is designed to weld with coated electrodes (excluding the cellulosic type) or using the TIG process with both scratch and high frequency starting. The machine has a drooping characteristic, which means that the output voltage decreases as the output current increases. This helps to prevent the electrode from sticking to the workpiece.