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8 D1.8 Seismic Supplement Welding Manual
www.lincolnelectric.com
Overview of D1.8
Content
FEMA 353 identified a variety of factors that made the pre-Northridge connection “…inherently susceptible
to brittle fracture...” and then listed variables that can be grouped into the broad categories of overall
structural design, connection design, connection details, materials, workmanship and inspection. While most
of the design-related issues are covered in AISC standards, D1.8 addresses connection details, materials,
workmanship and inspection issues.
These topics are covered in seven clauses as follows:
Clause 1 General Requirements
Clause 2 Reference Documents
Clause 3 Definitions
Clause 4 Welded Connection Details
Clause 5 Welder Qualification
Clause 6 Fabrication
Clause 7 Inspection
Following these clauses are eight mandatory annexes as follows:
Annex A WPS Heat Input Envelope Testing of Filler Metals for Demand Critical Welds
Annex B Intermix CVN Testing of Filler Metal Combinations (where one of the filler metals is FCAW-S)
Annex D Supplemental Welder Qualification for Restricted Access Welding
Annex E Supplemental Testing for Extended Exposure Limits for FCAW Filler Metals
Annex F Supplemental Ultrasonic Technician Testing
Annex G Supplemental Magnetic Particle Testing Procedures
Annex H Flaw Sizing by Ultrasonic Testing
Annex I Guidelines for the Preparation of Technical Inquiries for the Structural Welding Committee
Finally, the document concludes with an extensive commentary that provides background material and
explains the Structural Welding Committee’s intent behind many of the provisions, as well as an index.
New Terminology
In a manner that has been coordinated with the applicable AISC committees, D1.8 utilizes some new
terminology. An understanding of these terms, officially defined in Clause 3: Terms and Definitions of D1.8,
is necessary to properly apply the code.