Buttweld toolbar: 45 LR Ell 
Command line: R45LR
Places a 45 degree elbow with the end rolled at a 45 degree angle from the X-Y plane.
This command is only available for welded fittings.
last point
Starts the component at the last point of the previously-created component.
Start
Places the component anywhere in the drawing at any chosen start point.
Corner
Places the component at the corner of two pipes.
otherEnd
Places the start point of the component on the other end.
Up
Rotates the end of the elbow 45 degrees in the positive Z direction.
Down
Rotates the end of the elbow 45 degrees in the negative Z direction.
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This command is only available for welded fittings.
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The elbow centerline is out-of-plane. You must use a CAD UCS command to obtain the proper plane before modifying the elbow. For more information, see UCS in the CAD platform help.