mechanical coupling can be called as a mechanical device which is used to connect two mechanical links as well as transmit power between them.
mechanical joint is just used to joint two linkages . there is no power or torque transmission between them .
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*joint between the piston rod and and the crosshead of the steam engine *joint between the slide spindle and the fork of the valve mechanism *joint between the piston rod and the tail
by welding we add some filler material which will fill the gap between the joint.
The torque needed to loosen a bolt or joint is often much higher than the torque needed to put the bolt in in the first place. There is no set value difference between the two, unfortunately.
Two pieces of metal welded at a 90 degree angle is called a corner joint. Other common joint types: -Butt joint: two pieces of metal laid side by side and welded at the meet, essentially forming one sheet. -Lap joint: similar to a butt joint, but with overlap between the two pieces. -Tee joint: one piece is welded at a 90 degree angle to the second, but not at the edge (forming a 'T' shape).
A pivot joint in use can be illustrated by the movement of the neck. The neck contains several vertebrae that are connected by pivot joints, which allow the neck to rotate and move in different directions. For example, when you turn your head to the left or right, the pivot joints in your neck allow your head to rotate on your shoulders. This is an example of a pivot joint in use.