How does a gouging rod 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.
What polarity is used for gouging?
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 is gouging electrode?
The air-carbon-arc gouging process removes metal physically. Gouging or cutting occurs when the intense heat of the arc between the carbon electrode and the workpiece melts the metal. Our DC Copperclad Flat electrodes, available in two sizes, remove weld crowns and are used for scarfing applications. …
Can you gouge without air?
Recommended Cutting / Gouging Techniques: No special equipment required. Cutting can be performed Flat, Vertical Up, Vertical Down, Horizontal, or Overhead. Use AC or DC straight polarity.
Why gouging is done in welding?
Probably the fastest and most efficient way to remove metal is using ACA Gouging. The air- carbon-arc process utilizes the arc effect to melt the metal, which is subsequently blown away by a jet of compressed air.
Which angle should the gouging carbon electrode be when gouging?
35 to 45 degrees
Hold the torch so that the carbon electrode slopes back from the direction of travel with the air blast blowing past the tip of the electrode to evacuate the molten metal. The proper torch-to-workpiece angle is 35 to 45 degrees.
Do you reverse polarity when 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.
What is the purpose of gouging?
Unlike MMA welding where a stable weld pool must be maintained, this process forces the molten metal away from the arc zone to leave a clean cut surface. The gouging process is characterised by the large amount of gas which is generated to eject the molten metal.
What is gouging in welding process?
Air carbon arc gouging is a process of removing metal by means of heat generated from a carbon arc. The metal is only cut or gouged along the airflow direction. This process is simple to apply. The main purpose is to remove defective or old welds in order to repair or dismantle equipment.
Can you gouge stainless steel?
The air carbon-arc gouging process does not require oxidation to maintain the cut, so it can gouge or cut metals that the oxyfuel process cannot. In fact, most common metals (carbon steel, stainless steel, high-alloy wear plate, copper alloys and cast irons) can be cut using air carbon-arc gouging.
Can you gouge with a plasma cutter?
Most modern plasma cutting machines have the ability to gouge as well as cut. If you’ve already got a plasma cutting machine, there’s absolutely no reason you shouldn’t start plasma gouging.
Why do you need a gouging electrode for arc?
A standard, all purpose gouging electrode. Its controlled copper coating improves electrical conductivity (for more efficient, cooler operation) and helps maintain electrode diameter at the point of the arc. General purpose electrodes without the copper plating to avoid any chance of copper contamination in the base material.
What happens when you dig into metal for gouging?
Digging the electrode into the metal causes problems in controlling the gouging operation and will produce a rough surface profile. For gouging in positions other than vertical, the electrode is always pushed forward.
How is carbon arc gouging used in welding?
Air carbon-arc gouging removes metal through the intense heat of an arc created between a carbon electrode and the workpiece. The air carbon-arc gouging process does not require oxidation to maintain the cut, so it can gouge or cut metals that the oxyfuel process cannot.
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.