Galling is a type of wear that occurs when two metals come into contact with each other, causing friction. This type of friction causes the metals to become fused together, forming a hard and solid mass. This can occur in a variety of metalworking applications, including drilling, turning and milling. The resulting mass can be very difficult to remove and may cause other problems, such as a loss of performance and potential safety issues. In order to reduce the risk of galling, it is important to understand what causes it and how you can prevent it.
Galling can occur between a variety of different metals. However, it is most common when two softer metals come into contact with each other. This is because softer metals tend to have a lower degree of ductility and are more likely to adhere to other materials. Metals that are prone to galling include aluminum and stainless steel. Harder metals, such as tool steels and martensitic stainless steels, are less susceptible to galling.
The main cause of galling is friction. This is because friction creates heat, which can melt and adhere metals together. This is also why it is important to always use proper lubrication when fastening metal surfaces. Proper lubrication will help to reduce friction and prevent galling between metals.
Another cause of galling is metals that are contaminated. This is because dirt and debris can get between the threads of a bolt or screw and increase the chances of galling. Additionally, it is important to make sure that the bolt or screw has a good fit with the nut. This will reduce the chance of galling and ensure that the bolt or screw is tightened properly.
Finally, corrosion can be a significant factor in the cause of galling. This is because corrosion can affect the surface of a metal, making it more likely to generate friction and heat when it rubs against another metal surface.
In some cases, galling can be microscopic and not easily visible to the naked eye. In these cases, the galling does not prevent the metals from working properly but can still be a problem for components that require loose tolerances. In other cases, the galling can be very large and noticeable on metal surfaces. This is especially problematic for applications that involve repeated movement or sliding of metal parts. Langley Alloys offers a variety of alloys that are highly resistant to galling. To learn more about our alloys and the various applications where they can be used, contact us today. what is galling