What polarity is used for carbon arc gouging?
What polarity is used for carbon arc gouging?
The actual arc voltage is governed by arc length and the type of gouging. For most applications CAC-A is used with DCEP (reverse polarity). The electrode should extend at most 7 inches from the gouging torch with the air jet between the electrode and workpiece.
How does carbon arc gouging work?
Air carbon arc gouging is a process of removing metal by means of heat generated from a carbon arc. The process uses a carbon/graphite electrode, compressed air and a standard power source. The intense electric arc used between the tip of a carbon electrode and a metal work piece cuts and melts the work piece.
What is the main role of carbon in carbon arc welding?
In carbon-arc welding a carbon electrode is used to produce an electric arc between the electrode and the materials being bonded. This arc produces temperatures in excess of 3,000 °C. At this temperature the separate metals form a bond and become welded together.
What is the purpose for the compressed air at the electrode holder?
allows the air to pass through the arc between the electrode and the work piece, removing the molten metal effectively.
What polarity is used for gouging?
negative
In DC gouging, electrode polarity is normally negative but electrode manufacturers may well recommend electrode polarity for their brand of electrodes and for gouging specific materials. When using an AC power source, a minimum of 70V open circuit (OCV) is required to stabilise the arc.
What polarity is recommended should be used for carbon arc cutting steel?
positive
DC (electrode positive) is normally preferred for steel and stainless steel but AC is more effective for cast iron, copper and nickel alloys.
Which polarity is suggested use with shielded metal arc cutting?
Electrode-negative (straight polarity) welding results in faster melt-off of the electrode, and therefore a faster deposition rate. Deposition rate refers to the amount of filler metal melted into the weld joint. DC welding offers many benefits, making it a popular choice in shielded metal arc welding (SMAW).
What are the advantages of carbon arc welding?
Advantages of Carbon Arc Welding Low cost of equipment and welding operation. High level of operator skill is not required. The process is easily automated. Low distortion of work piece.
Which supply is used for carbon arc welding?
The technique of single-carbon arc welding uses a direct current power supply which is connected using a straight polarity.
Why are some carbon arc electrodes copper coated?
Controlled copper coating improves conductivity providing more efficient, cooler, operation and helps maintain electrode diameter at the point of the arc. Specially designed for close tolerance metal removal.
How many CFM do I need for arc gouging?
12-15 cfm will work but will work the compressor full time. The bigger the compressor and the more tank you have the longer it will last and more efficiently it will work. Most work can be accomplished without opening the air all the way on the torch.
What is the difference between air carbon gouging and arc gouging?
Air carbon 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. Air carbon arc gouging works as follows. An electric arc is generated between the tip of a carbon electrode and the workpiece.
What voltage do you use for 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. The actual arc voltage is governed by arc length and the type of gouging.
What is the air carbon-arc process?
The air carbon-arc process is flexible, efficient, and cost effective on practically any metal: carbon steel, stainless steel and other ferrous alloys; gray, malleable and ductile iron; aluminum; nickel; copper alloys and other nonferrous metals. Introduction 2-6 AIR CARBON-ARC GUIDE 89-250-008 SECTION 2: SAFETY AND HEALTH
What is the open circuit voltage for air carbon arc cutting?
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.
