A.user's.guide.to.aws.d1.8; Engineers - Lincoln Electric D1.8 User Manual

Significant revisions in the second edition are listed below. For more revisions please see pages vii-viii in the
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.
D1.8 Seismic Supplement Welding Manual
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