To describe the different types of structural welds and give basic information on weld preparation and weld quality.
Mechanical and geometrical characteristics of welds are described. Fundamental principles concerning edge preparation, fit-up, and quality of welds are given.
NOTATION
As% Elongation of steel at failure
a Throat thickness of welds [mm]
fy Nominal yield strength of parent metal [MPa]
fu Nominal ultimate strength of parent metal [MPa]
Where there are favourable working conditions, welding is the most economical way to make strong connections. Therefore, workshop connections are usually welded. Where site connections are necessary (erection) they are usually bolted except for bridges, but the connections are often prepared in the workshop with the welded plates, etc. necessary for the bolted joint.
Figures 1-3 show some examples on welded connections and the way they carry external loads.
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