Cutting Table Techniques Stages of a pierce: Stage 1. The transferred arc instantly heats the metal to its melting point and starts blowing the molten material away. In the initial stage of the piercing operation Cheap Danilo D'Ambrosio Jersey , the molten metal sprays out axially from the pierce point over the top of the plate in a shower of sparks. Stage 2. As the plasma jet pierces deeper into the material, a round-bottomed hole forms. This hole begins to direct the molten spray upward toward the torch. Stage 3. Once the arc breaks through the bottom of the plate, the sparks and molten material are ejected out the pierced hole. When the pierce is completed and the arc has developed to its full strength, the machine initiates to move and the torch starts cutting. If the torch moves too soon Cheap Daniele Padelli Jersey , the arc may not fully penetrate the material. If the torch delays too long, the arc will continue to eradicate material enlarging the hole until it extinguishes. Penetrating problems: The most common penetrating issues - double arcing, bridging, and snuffing - happen during the second stage of piercing when a fountain of 1500掳 C molten metal is drizzled back up at the torch. Under normal conditions Cheap Dalbert Henrique Jersey , the arc column is handled and fixated by a swirling vortex of gas as it passes from the electrode, through the nozzle, to the plate. This boundary layer of gas prevents the arc from contacting the copper nozzle. If the arc contacts the nozzle it would cut it as it does to any conductive metal. Double arcing is a term for any arcing that occurs secondarily to the main cuttingpiercing arc. It occurs when current flows through the nozzle or through another conductive path to the plate other than directly through the arc column. This can occur due to low plasma gas flow, excessive amperage or a serious disturbance in the plasma jet. Such a disturbance happens when the torch is piercing too close to the plate. The spray of electrically conductive metal disturbs the plasma gas jet by disrupting the electric field surrounding the arc and causing the arc column to grow. It is theorized that multiple arc paths develop through these tiny bits of metal Cheap Cristian Ansaldi Jersey , pulling the arc out of its axial-symmetric path. If the arc is pulled into the sidewall of the nozzle it causes a gouge, nick or sometimes a symmetrical chamfer along the exit orifice (flowering). Damage to the nozzle leads to serious cut quality problems such as excess bevel angle, dross, failure to penetrate the material etc. Bridging is a more extreme form of double arcing. It occurs if the molten material builds up in a puddle that contacts both torch and plate. Since this puddle is electrically conductive Cheap Borja Valero Jersey , it provides a short circuit to the work piece. The arc observes a path of lower resistance, to the plate and takes it. This usually causes a catastrophic failure of the shield and damage to the nozzle. Even the state-of-the-art electrically isolated copper shields of today's plasma torches are not immune from this type of failure. Once the shield is in contact with a ball of molten material it is at the same potential as the plate, therefore the arc will conduct through the shield causing it to fail. Plasma gas snuffing is the most extreme form of double arcing. Snuffing occurs when the torch begins to pierce with the torch nozzle or shield pressed against the plate. For example, if the automatic torch height control finds its initial height by pushing against the plate Cheap Antonio Candreva Jersey , and the plate is bowed or thin enough to be pushed down, then the retraction of the torch will not set the correct initial height. The torch will fail to "clear the plate" because the plate follows the torch back up to its initial height setting. This often occurs in underwater cutting applications when the operator cannot see the front end of the torch. Snuffing of the plasma gas leads to uncontrolled double-arcing in the plasma chamber. This causes catastrophic failure of the electrode, nozzle, and shield. Total Views: 26Word Count: 672See All articles From Author
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