Gouging


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Related to Gouging: back gouging, arc gouging

gouging

[′gau̇j·iŋ]
(engineering)
The removal of material by electrical, mechanical, or manual means for the formation of a groove.

compressor blade damage

compressor blade damageclick for a larger image
Various types of damages that compressor blades can sustain. Only one or two may take place simultaneously though these have been combined in this illustration.
The various types of damages to compressor blades and their appearances are as follows:
i. Bend. The blade gives the appearance of ragged edges. Smooth repair of the edges or surface in question can be carried out, but the extent of the damage that can be repaired is limited.
ii. Bow. The main source of this type of damage is a foreign object. The blade is bent at the tips and the edges.
iii. Burning. The damage is caused by overheating. The surface of the blade is discolored. If the overheating is severe, there may be some flow of material as well.
iv. Burr. A ragged or turn-out edge is indicative of this type of damage. This takes place during the grinding or cutting operation of the blade at the manufacturing stage.
v. Corrosion. Oxidants and corrosive agents, especially moisture present in the atmosphere, are the main reasons for the corrosion or pitting of the blades. Normally, regular washing is sufficient to prevent it. The blade gives a pitted appearance, and there is some breakdown of the surface of the blade. Also called pitting.
vi. Cracks. Excessive stress from shocks, overloading, or faulty processing of blades during manufacturing can cause cracks and result in their fracture.
vii. Dent. These can be caused by FOD (foreign-object damage) or strikes by dull objects like those in bird strikes. Minor dents can be repaired.
viii. Gall. This type of damage is from the severe rubbing of blades, in which a transfer of metal from one surface to another takes place.
ix. Gouging. The blade gives the appearance of displacing material from its surface, and a tearing effect is prominently visible. This type of damage is from the presence of a comparatively large cutting material or foreign body between moving parts.
x. Growth. The damage manifests itself in the form of elongation of the blades. Growth type of damage takes place because of continued and/or excessive heat and centrifugal force.
xi. Score. Deep scratches are indicative of scoring, which is caused by the presence of chips between surfaces.
xii. Scratch. Narrow and shallow scratches are caused by sand or fine foreign particles as well as by mishandling the blades.
xiii. Pitting. Pitting takes place because of atmospheric corrosion, especially seawater. The surface of the blade shows signs of pitting.
References in periodicals archive ?
If such generosity could be depended on, there would be no need for victims to buy any more after a disaster than they normally do, and there would be no price increases or controversy over "price gouging.
After Hurricane Sandy hit in the Northeast, reports of local businesses price gouging customers became rampant in New York and New Jersey.
According to US laws, during natural disasters price gouging on essential goods like food, water, gas, is illegal.
It turns out, however, that there is no gasoline price gouging going on in Massachusetts.
The machine offers two independent welding arcs up to 400 amps (no interaction between the arcs), and the ability to parallel both independent welding outputs to create an extremely powerful 800 amps of welding power for running large electrodes, stud welding and carbon arc gouging (up to 3/8-inch carbons).
A MAN who gouged out his eyes while in jail in Miami has been sentenced to 25 years in prison for gouging his wife's eyes after he was released.
Cooper warned consumers to be on the lookout for price gouging and invited them to report suspected incidents of it.
1) The Attorney General's Office received almost 9,000 reports of price gouging during the declared state of emergency covering the 2004 hurricanes.
I am more frustrated at losing the game than the gouging.
A THRILLING game and dramatic last-gasp winner for Ireland were forgotten amid accusations of gouging after the game.
That leads to gouging, scoring and rust on the towbar pivot cylinder.
Professional sport doesn't have to bow to big business or the stock market when it comes to creative bookkeeping and money gouging.