12 Facts About Galling

1.

Galling is a form of wear caused by adhesion between sliding surfaces.

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2.

Galling is caused by a combination of friction and adhesion between the surfaces, followed by slipping and tearing of crystal structure beneath the surface.

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3.

Galling is most commonly found in metal surfaces that are in sliding contact with each other.

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4.

Galling is a common problem in most applications where metals slide while in contact with other metals.

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5.

Galling is adhesive wear that is caused by microscopic transfer of material between metallic surfaces, during transverse motion .

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6.

Galling is a common problem in sheet metal forming, bearings and pistons in engines, hydraulic cylinders, air motors, and many other industrial operations.

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7.

Galling is distinct from gouging or scratching in that it involves the visible transfer of material as it is adhesively pulled from one surface, leaving it stuck to the other in the form of a raised lump .

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8.

Galling requires two properties common to most metals, cohesion through metallic-bonding attractions and plasticity .

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9.

Galling occurs initially with material transfer from individual grains, on a microscopic scale, which become stuck or even diffusion welded to the adjacent surface.

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10.

Galling is often found between metallic surfaces where direct contact and relative motion have occurred.

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11.

Galling often occurs with aluminium compounds and is a common cause of tool breakdown.

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12.

Galling can occur even at relatively low loads and velocities, because it is the real energy-density in the system that induces a phase transition, which often leads to an increase in material transfer and higher friction.

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