6) Fundamental concepts in strength calculations of welded joints and connections are provided.
These concepts are of basic importance in assessing the capacity (ASD) or the resistance
(LSD) of welds for which pertinent formulae are tabulated in Clauses 11 and 12 and which
involve:
- types of welds, types of groove welds
- their minimum and effective sizes together with separate provisions for fillet welds, plug
and slot welds
7) Requirements governing the workmanship and welding technique of the fabricator are included:
- conditions for matching filler-base materials for welding of corrosion resistant steels
- maximum exposure times and subsequent storage and conditioning of electrodes,
especially those of the low hydrogen type
- specified limits of acceptability of planar discontinuities in base material and recommended
action for repair of edge discontinuities
- preparation of material for welding with tolerance limits for assembly and fit-up of structural
elements
- workmanship tolerances for the preparation and fit-up of groove welded joints
- provisions for tack welds, temporary welds and seal welds
- details of welding procedures and techniques for each welding process
- extensive treatment of stud welding
- recommended sequences in assembly and welding aiming at minimizing distortion
and residual stresses
- preheat and interpass temperatures as tabulated are related to steel designations
(Carbon equivalent – expressing their weldability), thickness of material, and low
hydrogen or non-low hydrogen electrodes or processes.
- conditions permitting reduction of preheat temperatures for minimum single pass SAW fillet
sizes
- dimensional tolerances for finished welded structural elements
- acceptable profiles of fillet and groove welds
- corrective action for defective welds
- requirements for stress relief, when specified. These refer to temperature, holding time and
rates of heating and cooling