# >> College & Higher Education >> College

How to Weld 7022 Aluminum

As a result of traditional heat welding procedures, 7022 aluminum exhibits a particularly high degree of softening -- and subsequent loss of tensile strength. The higher the heat input, the higher the degree of softening and the wider the softening area, which is located at a greater distance from the fusion boundary. To reduce the softening effects that welding has on 7022 aluminum, use friction welding, which grinds two pieces of aluminum together at high speeds to cause solid bonds to form between their surfaces.

Friction welding machine

Instructions

- 1
  Attach one of the pieces of 7022 aluminum to the rotating tool of the friction welding machine. The tool will cause the aluminum piece to rotate at a constant speed.
- 2
  Allow the rotating tool to push the two pieces of aluminum together. Use the central pin to exert a force on the piece of aluminum not attached to the rotating tool, thus pushing the two pieces closer together for a predetermined amount of time.
- 3
  Discontinue the rotating force from the rotating tool, but maintain or increase the friction rotating force on the two pieces of aluminum for a predetermined amount of time.

What Colleges Accept Transfer Credits?

Ideas for Seventh Grade Science Projects About Electricity