Materials and Construction
The loss of strength in compression which occurs, when there is a gain of strength in tension due to over loading is called

Hooke's effect
Relaxation
Bauschinger effect
Hysterisis

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Materials and Construction
Lead pipe is

All of these
Usually joined by burning (e.g. by melting to adjacent pieces with a torch)
Having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain
Especially resistant to solutions containing H₂SO₄

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