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<p>used to weld pipes together. However, unlike Rotary friction welding, it does not require either of the parts to be rotated. Instead a ring is used to generate the necessary heat by rotating it around the pipes.</p>

<p><big>Linear friction welding</big></p>
<p>Linear friction welding (LFW) is the act of moving a single component in a linear reciprocating motion across the face of a stationary component.</p>

<p><big> Friction stir welding </big></p>
<p>Friction stir welding (FSW) is a solid-state joining process that uses a non-consumable tool to join two facing</p><p>
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