This Second Edition of Technical Digest 8 has been developed by an Ad-Hoc Group of the Steel Joist Institute's Engineering Practice Committee and is an extensive update of the previously written digest. Technical Digest 8 details the requirements that the SJI member companies must follow in the manufacturing of steel joists and joist girders and provides the reader information on the various types of welding processes and weld types, and weld designs currently and previously used by SJI member companies. Frequent reference has been made throughout the digest to the American Welding Society (AWS) Welding Specifications. Compliance with AWS criteria will satisfy the SJI welding requirements, and in many cases the SJI requirement is in compliance with a particular AWS provision. However, there are some differences. The reasons for the SJI to maintain their own specification language for welding is discussed throughout this document.