Machine Design
For longitudinal joint in boilers, the type of joint used is

Lap joint with one ring overlapping the other
Butt joint with single cover plate
Butt joint with double cover plate
Any one of the above

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Machine Design
Cap screws are

Used to prevent relative motion between parts
Provided with detachable caps
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut

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