What is plasma arc gouging?
Plasma 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.
What is plasma arc gouging How can it be used?
Plasma gouging – removing metal using a plasma arc – is similar to plasma cutting. A plasma arc between the torch and the workpiece melts the metal, and a gas jet blows away the molten metal. It can also be done on fully automated CNC cutting tables. …
What are the two primary types of plasma arc cutting processes?
There are two types of Plasma Arc Machining (PAM) Systems such as Transferred Arc PAM system and Non-Transferred Arc PAM system. In Transferred Arc PAM system, Plasma arc is transferred between electrode and workpiece.
What is the plasma arc process?
Plasma arc welding is an arc welding process wherein coalescence is produced by the heat obtained from a constricted arc setup between a tungsten/alloy tungsten electrode and the water-cooled (constricting) nozzle (non-transferred arc) or between a tungsten/alloy tungsten electrode and the job (transferred arc).
What is a possible use for plasma gouging?
Applications. Plasma gouging was developed as a tool for weld removal and weld preparation. Backgouging was used to remove metal from the reverse side of arc-welded joints to eliminate defects and improve strength.
What is gouging process?
The gouging process is characterised by the large amount of gas which is generated to eject the molten metal. Compared with alternative gouging processes, metal removal rates are low and the quality of the gouged surface is inferior. When correctly applied, MMA gouging can produce relatively clean gouged surfaces.
What is Arc Gouging used for?
The main goal of air arc gouging is to remove defective or old welds to repair or dismantle equipment. Unlike oxy-fuel cutting, air arc gouging avoids the need for oxidation of the metal to cut. The rate of metal removal depends on the efficiency of air jet in removing molten metal and the melting rate.
How an arc is created in a plasma system?
The 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.
Which is part of plasma arc machining?
This is virtually a mixture of free electrons, positively charged ions and neutral atoms. What is plasma arc machining? Plasma arc machining is a metal removal process in which the metal is removed by focusing a high-velocity jet of high temperature (11,000°C to 30,000°C) ionized gas on the workpiece.
How does carbon arc gouging work?
Air carbon arc gouging works as follows. An electric arc is generated between the tip of a carbon electrode and the workpiece. The metal becomes molten and a high velocity air jet streams down the electrode to blow it away, thus leaving a clean groove.