GOUGING WELDING PDF DOWNLOAD
Prepare joints before welding. EFFICIENCY. • Speed is comparableto the oxy-fuel gouging process. • Oxy-fuel gouging requires more effort from the operator. The main advantage of manual metal arc (MMA) gouging is that the same power source can be used for welding, gouging, or cutting, simply by changing the type of electrode. As in conventional MMA welding, the arc is formed between the tip of the electrode and the workpiece. Plasma gouging is a variation of plasma cutting, in which the arc is "defocused" slightly by increasing the hole size in the constricting orifice. A cutting arc is directed downward through the metal to blow the molten metal down and out through the kerf, forcing the two pieces of metal to separate.
|Published:||9 March 2015|
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The most distinct differences are in cost, fume production, and necessary postcutting operations.
Choosing a gouging method
In recent years environmental and quality gouging welding have taken center stage in the welding industry. This increased emphasis on safety and health often is accompanied by reconsideration of how certain tasks are performed, for example, cutting and gouging metal.
Gouging—a requirement for many years in several industries and applications—is one method to scrutinize. Especially in maintenance and repair, the ability to gouge or groove metal gouging welding critical and deserves proper consideration.
Air Arc Gouge Torch | Lincoln Electric
Two of the most common methods of gouging gouging welding are plasma gouging and air carbon-arc gouging. A Brief History In maintenance and repair, operators must remove any of the following: Backgouging welds to sound metal also may be necessary when both sides of a plate are to be gouging welding.
Gouging also is used in the foundry business to remove fins, risers, and defects from castings.
gouging welding Common methods gouging welding gouging are mechanical techniques such as grinding, hand milling, routing, and chipping; oxyfuel gouging, which can be used only on carbon steels; and air carbon-arc gouging. A young scientist, Robert Gage, discovered that by forcing a gas tungsten arc through a small orifice in a process similar to focusing a beam of light through a lens, the temperature and intensity of the arc could be increased.
- Gouging | AGA Industrial Gases
By passing a fairly high gas flow through this focused gouging welding, it could cut metal. Plasma gouging is a variation of plasma cutting, in which the arc is "defocused" slightly by increasing the hole size in the constricting orifice.
A cutting arc is directed downward through the metal to blow the molten metal down and out through the kerf, forcing the gouging welding pieces of metal to separate.
Choosing a gouging method - The Fabricator
In plasma gouging, the torch is inclined gouging welding an angle to the workpiece, and the arc plows out a groove on the metal surface and blows the molten metal off to the side.
A more intense cutting arc causes a groove too deep and narrow for most applications, so the defocused arc is used for gouging. Fume, Noise Production In carbon-arc gouging, an electric arc at the end of a consumable carbon rod melts the metal, and a continuous blast of compressed air violently blows the molten metal away.
The constituents of the molten metal react strongly with air, and the force of the air blast tends gouging welding vaporize much of the molten metal into fine droplets, creating a high level of fume consisting of metal vapor, carbon dust, and metallic byproducts.
Typically, the fume level of an air carbon-arc gouging operation is higher than gouging welding allowed exposure level to welding fumes in a workplace.
Depending on the material being gouged, exposure to particular toxins that are constituents of the base metal also can cause problems. Plasma also uses an electric arc to melt the metal being gouged, but the plasma gas gouging welding pushes the molten metal out of the groove.
Because this is done less violently than gouging welding air carbon-arc gouging, less molten metal vaporizes, reducing the metallic vapor and reaction with the surrounding atmosphere.
When air is used as the plasma gas, some reaction occurs, but the volume of air is lower than that found in air carbon-arc gouging.
Air arc gouging torch
If inert gas is used, the molten metal in the gouge is protected from the surrounding atmosphere and has gouging welding chance to react gouging welding the air. However, aluminum applications are an exception to this. This metal's lightness and strong affinity for oxygen do create fumes.
Also, the strong ultraviolet content of the radiation from the plasma arc increases the carbon monoxide, ozone, and nitrogen oxides generated. These amounts generally are gouging welding threshold limits.
Noise also can be a concern for cutting operators. Plasma gouging can reduce noise production. Typically, when measured at conditions that create a similar gouge size, plasma gouging is 5 to 10 decibels quieter than carbon-arc gouging.
Gouging is gouging welding to gas cutting. The gouging welding gas flame heats up the piece to be worked to ignition temperature and the cutting gouging welding jet combusts and carries away the molten metal.
The equipment is the same as in gas cutting, only the nozzle needs to be changed. In gas cutting the cutting oxygen beam is directed at a right-angle towards the work-piece, while in gouging the oxygen beam gouging welding almost parallel with the surface of the piece to be gouging welding.