page_title: Galling
hierarchical_section_title: Galling
caption_attribution_description: English: A picture on sheet damage created by the galling phenomenon using a SOFS (TNO) test equipment. The damage illustrates a characteristic uneven surface. No continues lines or stripes are present but the whole contact zone is scratched implying wear below the surface layer. The pattern is consequently discussed as a sign of severe adhesive bonding between the surfaces and the damage must involve a clear change in the sheets plastic behavior and involve a larger deformed volume compared to mild adhesive flattening of oxides. “Severe adhesive contact” is possibly the same as “cold welding”, “friction welding”, “scuffing” or other wear phenomenon’s.
context_page_description: Galling is a form of wear caused by adhesion between sliding surfaces. When a material galls, some of it is pulled with the contacting surface, especially if there is a large amount of force compressing the surfaces together. Galling is caused by a combination of friction and adhesion between the surfaces, followed by slipping and tearing of crystal structure beneath the surface. This will generally leave some material stuck or even friction welded to the adjacent surface, whereas the galled material may appear gouged with balled-up or torn lumps of material stuck to its surface.
  Galling is most commonly found in metal surfaces that are in sliding contact with each other. It is especially common where there is inadequate lubrication between the surfaces. However, certain metals will generally be more prone to galling, due to the atomic structure of their crystals. For example, aluminium is a metal that will gall very easily, whereas annealed steel is slightly more resistant to galling. Steel that is fully hardened is very resistant to galling.
  Galling is a common problem in most applications where metals slide while in contact with other metals.
context_section_description: Galling is a form of wear caused by adhesion between sliding surfaces. When a material galls, some of it is pulled with the contacting surface, especially if there is a large amount of force compressing the surfaces together. Galling is caused by a combination of friction and adhesion between the surfaces, followed by slipping and tearing of crystal structure beneath the surface. This will generally leave some material stuck or even friction welded to the adjacent surface, whereas the galled material may appear gouged with balled-up or torn lumps of material stuck to its surface.
  Galling is most commonly found in metal surfaces that are in sliding contact with each other. It is especially common where there is inadequate lubrication between the surfaces. However, certain metals will generally be more prone to galling, due to the atomic structure of their crystals. For example, aluminium is a metal that will gall very easily, whereas annealed (softened) steel is slightly more resistant to galling. Steel that is fully hardened is very resistant to galling.
  Galling is a common problem in most applications where metals slide while in contact with other metals. This can happen regardless of whether the metals are the same or of different kinds. Alloys such as brass and bronze are often chosen for bearings, bushings, and other sliding applications because of their resistance to galling, as well as other forms of mechanical abrasion.
caption: The damage on the metal sheet or characteristic pattern illustrates an "uneven surface", a change in the sheet material's plastic behaviour and involves a larger deformed volume compared to mere flattening of the surface oxides.
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