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Elbow is a fitting used to change pipe direction, 45 degrees in this case,

LR is referred as "long Radius" ( normally most pipes, unless you ask for SR, short radius). Butt weld refers to welding 2 ends from two separate fittings or pipe.

Both ends are beveled (30 degrees is tapered from inside pipe diameter to outside pipe diameter on pipe/fitting connections)

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Q: What does mean by Elbow 45 butt weld LR?
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