Flashcards
Chapter 8 Plasma Arc Cutting
Cards in this deck (26)
- 1Angular DeflectionWhen an expansion joint experiences bending about its center, which is on the centerline and halfway between the ends of the bellows, this deflection is referred to as angular. Multiple angular deflections in multiple planes produce a single angular deflection in a single resultant plane. ...
- 2Arc cuttingarc. ... Cutting processes include oxygen and fuel gas and electrical arc gouging.
- 3arc plasmaarc. ... Cutting processes include oxygen and fuel gas and electrical arc gouging.
- 4cupWalking the Cup is a Tig welding technique
When the cup is rested inside a groove or the 2 sides of a tee joint, ... But when the cup has no groove to rest in, a different technique is used that is akin to walking a 55 gallon drum across a shop floor. - 5deflectornoun A plate, diaphragm, or cone in a lamp, furnace, or stove, to bring the flame and gases into intimate contact and improve the combustion.
- 6drossA thin layer of re-solidified metal that can form along the sides or bottom of the kerf. Dross is similar to recast but it is an oxide or oxide and nitride mixed material as opposed to a metallic material.
- 7Electrode setbackelectrode setback can cause inconsistent arc starting and torch failure
- 8electrode tipThe sharpened electrode tip provides a steady and concentrated arc into the weld piece. The sharpening angle and length has an effect on the arc width and penetration depth.
- 9Heat affect zoneThe heat affected zone (HAZ) is a non-melted area of metal that has undergone changes in material properties as a result of being exposed to high temperatures. These changes in material property are usually as a result of welding or high-heat cutting.
- 10high frequency alternating currentigh Frequency AC (HFAC) power systems – systems having frequencies higher than the usual 60 Hz – may have advantages in some applications, especially where small size and weight are important (aircraft, ships, etc), or where variable operating speed increases efficiency.
- 11ionized gasPlasma is an ionized gas and also called the fourth state of matter. For the formation a plasma, a gas can be heated or an excess of free electrons is needed to displace electrons in the atoms and molecules of the bulk gas.
- 12joulesn short, the welding heat input is defined as the amount of energy that is used by the welding process to deposit a specific length of weld. The usual practice is to express the energy in terms of "Joules".
- 13kerfKerf is defined as the width of material that is removed by a cutting process. ... The “cut angle” on the edge of the part makes measuring the kerf width sorta tricky, but for consistency, the word “kerf” should only be used when talking about the actual cut width.
- 14kerf angleKerf is defined as the width of material that is removed by a cutting process. ... The “cut angle” on the edge of the part makes measuring the kerf width sorta tricky, but for consistency, the word “kerf” should only be used when talking about the actual cut width.
- 15nozzlehe nozzle constricts the ionized gas and the main arc as they flow through the nozzle opening, increasing the plasma's energy density and velocity. Plasma cutting machines produce plasma up to 20,000°C which moves towards the workpiece at up to three times the speed of sound.
- 16nozzle insulatorNozzle Insulator. It is between the electrode tip and the nozzle tip. It gives the critical gap spacing and the electrical separation of the parts. Electrode Setback.
- 17nozzle tipNozzle Tip: The nozzle tip has a constricting orifice. This provides the restriction of gas that the arc requires to form the plasma. Nozzle: The nozzle, or cup, is made of ceramic material. Ceramics have a high heat resistance. Helps keep the internal parts from shorting.
- 18pilot arcThe spark ionizes the plasma gas, allowing it to become electrically conductive and producing a low-resistance current path between the electrode and nozzle. Along this current path, an initial, low-energy arc—i.e., the pilot arc—forms as energy flows and discharges between the two components.
- 19plasmastate of matter that is found in the region of an electrical discharge
- 20plasma arc gougingPlasma arc gouging is a variant of the plasma arc process. The arc is formed between a refractory (usually tungsten) electrode and the workpiece. Intense plasma is achieved by constricting the arc using a fine bore copper nozzle.
- 21shieldA hand shield is a type of welding mask that is designed to be hand-held by the observer for a short duration. ... Hand shields and welding helmets also protect the face, neck, and ears against damage from direct heat or welding spatter hazards that are associated with certain welding activities.
- 22stack cuttingCutting a stack of metal plates with a single cut using a stream of oxygen.
- 23torch standoff distanceStandoff is the distance maintained between torch and work-piece after piercing (while cutting). Most modern systems use an arc voltage feedback system. Increasing the arc voltage increases the standoff distance and widen the kerf.
- 24water shroudAs a steady supply of “clean” water is fed to the side block, the 525-761 Water Shroud Kit blocks the surrounding water as well as unwanted debris from coming in contact with the vital parts of the breathing system. ...
- 25water tableOne solution is a water table, where the metal being cut is underneath a layer of water that prevents it from generating fumes. The other solution is a downdraft table, where air flows down through the table and pulls dust and fumes away from the cutting ar
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- Flashcards on Chapter 8 Plasma Arc Cutting, created by Brenden Mulligan on 14/03/2021.
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- Brenden Mulligan
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