| 1. | Tubes and tool joints are welded using inertia or friction welding.
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| 2. | In Direct Drive Friction welding the drive motor and chuck are connected.
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| 3. | Friction welding provides a " full strength " bond with no additional weight.
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| 4. | Another advantage of friction welding is that it allows dissimilar materials to be joined.
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| 5. | Lubrication is therefore required between the center and workpiece to prevent friction welding from occurring.
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| 6. | The work of friction is used to mix and join materials such as in the process of friction welding.
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| 7. | The "'seizure resistance "'is the ability of a material to resist friction welding.
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| 8. | Friction welding is also used with thermoplastics, which act in a fashion analogous to metals under heat and pressure.
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| 9. | In Inertia Friction Welding the drive motor is disengaged, and the work pieces are forced together by a friction welding force.
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| 10. | In Inertia Friction Welding the drive motor is disengaged, and the work pieces are forced together by a friction welding force.
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