Final answer:
To use semi or fully automatic electrode holders with 10 mm or larger carbon electrodes, a quality air hose with a minimum inner diameter of 1/4 inch and fittings with a pressure rating higher than the system's maximum pressure is required, potentially using a larger diameter hose for longer distances or higher air volumes.
Step-by-step explanation:
The selection of air hose and fittings for semi or fully automatic electrode holders that accommodate 10 mm (3/8") diameter or larger carbon electrodes relies on several factors, including the capacity of the air supply system, the operating pressure, and the distance from the air compressor to the electrode holder. Normally, for this electrode size, a hose with an inner diameter of at least 1/4 inch is recommended. However, depending on the length of the hose and the volume of air required, a larger diameter might be necessary to minimize pressure loss over the hose length. Similarly, the fittings should be compatible with the hose and have a pressure rating that exceeds the system's maximum operating pressure to ensure safe operation. It is essential to use good quality, robust fittings to withstand the rigors of the application.