Steel Structure Design - Engineering

Q1:

The effective length of a weld, is taken as the actual length

A minus the size of weld

B minus twice the size of weld

C plus the size of weld

D plus twice the size of weld

E none of these.

ANS:B - minus twice the size of weld

Why not its minus 4s?

As two end would be having two end returns of length 2s.