plasma cutting tip1英文电子书.pdf

The torch main body (torch-head) holds the consumable parts in near perfect alignment: •Electrode •Swirl ring •Nozzle •Retaining cap •Shield cap The copper electrode carries the negative charge from the a small insert of hafnium or tungsten. Hafnium for air and oxygen plasma gases Tungsten for nitrogen or argon hydrogen plasma gases Patented hafnium-sizing technology significantly increases electrode life. Electrode after Electrode after normal use excessive use The nozzle constricts and focuses the plasma jet The size of the nozzle orifice is directly related to amperage: the higher the amperage, the larger the orifice needs to be Normal Ovaling The swirl ring has small holes in it to meter the flow of gas into the plasma chamber These holes spin the plasma gas into a swirling vortex that helps to center and constrict the arc The retaining cap, together with the swirl ring, is used to hold the electrode and nozzle in alignment •It also protects the operator from the voltage potential between the electrode and nozzle Shields and shield caps are designed to protect the torch and nozzle from molten spatter and radiant heat •Shields also channel the flow of secondary gas or water •Electrically isolated allowing torch to touch work piece Select consumable parts using the appropriate cut charts Install consumables in the proper order do not over tighten! Electrodes and Nozzles should be replaced as a set Swirl rings should be replaced when necessary, usually about every 20 electrode/nozzle changes Shields, retaining caps, etc. only need replacing when they are physically worn or cut quality be