Lincoln Electric D1.8 - Manual (Page 11)

D1.8 Seismic Supplement Welding Manual
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11
AWS D1.8/D1.8M:2009.
  Figures 4.1 and 4.2 – New figures added to illustrate detail of the transition of butt joints
for unequal thicknesses.
  Subclause 6.3.2 – Clarified and corrected diffusible hydrogen requirements for filler metals.
  Subclause 6.3.6 – Modified to disallow exemptions from heat input envelope and classification
lot testing when lowest anticipated service temperature (LAST) is less than +50°F.
  Subclause CA5.2 – Removed the provision that required two passes per layer to fill the test plate.
It is now deemed acceptable to use single passes per layer since achieving acceptable results
under such conditions is typically more difficult than when split layers are used.
  Subclause C6.13 – Revised welder identifications requirements to permit methods other than the
use of stamps or marks on the piece.
A User’s Guide to AWS D1.8
Certain portions of D1.8 are more important to some parties than others, depending on their specific role
in the construction process. The following is a general summary of sections of particular interest to the
various participants in a construction project.
Engineers
The primary tasks of the Engineer as they relate to D1.8 are contained in Clause 1.2.1, entitled
“Engineer’s Responsibilities.” The Engineer must identify, among other items, the following:
  Members that comprise the SFRS
  Locations of the Protected Zones in members of the SFRS
  Welds that are Demand Critical
  Locations where steel backing is required to be removed
  Locations where fillet welds are required when backing is permitted to remain
  Locations where weld tabs are to be removed
  Locations where fillet welds are required to reinforce groove weld, or to improve connection geometry
  Locations of weld access holes, and their required shape
The Engineer is also required to develop a Quality Assurance Plan (QAP) for the project. AISC Seismic
Provisions Annex Q contains a recommended example of a QAP that the D1.8 commentary encourages
the Engineer to adopt without modification. See D1.8, clause 1.2.1.
Structural Detailers