What equipment is needed for arc carbon gouging?
What equipment is needed for arc carbon gouging?
Required equipment includes an air compressor, welding power source, carbon electrode and a gouging torch. The air carbon arc process is shown in figure 10-75.
What type of power source is needed for air carbon arc gouging?
welding power
However, any three-phase welding power source of sufficient capacity may be used for air carbon arc gouging. The arc voltage used in air carbon arc gouging and cutting ranges from a low of 35 to a high of 56 volts; thus the open-circuit voltage should be at least 60 volts.
What is air carbon 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.
What are the electrodes used in air carbon arc cutting made of?
The most widely used electrodes are DC copper-coated electrodes that are formed by combining the carbon-graphite mixture with a binder. These electrodes have groove uniformity, stable arc characteristics, and prolonged service life.
What is CAC A in welding?
A carbon arc cutting process that uses an arc to melt metal which is blown away by a high-velocity jet of compressed air. The electrodes are rods made from a mixture of graphite and carbon, and most are coated with a layer of copper to increase their current-carrying capacity.
What is gouging welding?
Gouging is the term to define a type of corrosion which occurs on a metallic surface in which a hole, groove or indentation is created. In welding, gouging has been a requirement for many years in several industries and applications – and is one method to scrutinise.
How is carbon arc gouging used in welding?
Myron Stepath, a welding engineer, developed air carbon-arc gouging to remove several hundred feet of flat, cracked, stainless steel weld. Previously, carbon-arc cutting removed overhead and vertical defective welds and rivet heads. The carbon-arc melted the metal, then gravity moved the molten metal away.
How does an arc form in a carbon electrode?
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.
What kind of rod is used for arc gouging?
The electrode is a graphite (carbon) rod which has a copper coating to reduce electrode erosion. Electrode diameter is selected according to required depth and width of gouge. Cutting can be precisely controlled and molten metal/dross is kept to a minimum.
What’s the difference between air jet and arc gouging?
The main difference between this gouging technique and the others is that a separate air jet is used to eject molten metal from the groove. Click here to see our latest technical engineering podcasts on YouTube. Air carbon arc gouging works as follows. An electric arc is generated between the tip of a carbon electrode and the workpiece.
