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This is a Schedule of Special Inspections document detailing the structural steel welding inspection requirements, specifically related to the PALMDALE ARTCC stairways and loading ramp demolition and replacement project. The document outlines mandatory inspection procedures in accordance with 2021 IBC 1705.2.1 and AISC 360-22 standards.

The schedule specifies two categories of inspections: "PERFORM" tasks that must be completed for each weld, fastener, or bolted connection, and "OBSERVE" tasks that require random daily sampling. Key inspection requirements include verification of welding procedures specifications (WPS), manufacturer certifications for consumables, material identification, welder qualifications, and detailed fit-up inspections for both groove and fillet welds. During-welding inspections cover environmental conditions, consumable handling, equipment settings, travel speed, welding materials, and other technical parameters. The document serves as a quality control checklist to ensure proper execution of structural steel welding work on the project.

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SCHEDULE OF SPECIAL INSPECTIONS

A. STRUCTURAL STEEL – WELDING

ALL OR PORTIONS OF THIS SECTION ARE APPLICABLE IF BOX IS CHECKED: ☒

STEEL INSPECTION PRIOR TO WELDING – VERIFY THE FOLLOWING ARE IN COMPLIANCE WITH

2021 IBC 1705.2.1, AISC 360-22: Table N5.4-1 and Table C-N5.4-1

TASK INSPECTION TYPE1 DESCRIPTION

1. Verify that the welding procedures specification (WPS) is available

PERFORM

2. Verify manufacturer certifications for welding consumables are available

PERFORM

3. Verify material identification

PERFORM Type and grade.

4. Verify use of qualified welders

PERFORM Welding by welders, welding operators, and tack welders who are qualified in conformance with requirements.

5. Welder Identification System

OBSERVE Fabricator or erector, as applicable, shall maintain a system by which a welder who has welded a joint or member can be identified.

6. Fit-up of groove welds

(including joint geometry) OBSERVE Joint preparation

Dimensions (alignment, root opening, root face, bevel)

Cleanliness (condition of steel surfaces) Tacking (tack weld quality and location) Backing type and fit (if applicable)

7. Configuration and finish of access holes

OBSERVE

8. Fit-up of fillet welds OBSERVE Dimensions (alignment, gaps at root) Cleanliness (condition of steel surfaces) Tacking (tack weld quality and location)

STEEL INSPECTION DURING WELDING – VERIFY THE FOLLOWING ARE IN COMPLIANCE WITH

2021 IBC 1705.2.1, AISC 360-22: Table N5.4-2 and Table C-N5.4-2

TASK INSPECTION TYPE DESCRIPTION

9. Control and handling of welding consumables OBSERVE Packaging

Electrode atmospheric exposure control

10. No welding over cracked tack welds

OBSERVE

11. Environmental conditions OBSERVE Wind speed within limits Precipitation and temperature

STEEL INSPECTION DURING WELDING – VERIFY THE FOLLOWING ARE IN COMPLIANCE WITH

2021 IBC 1705.2.1, AISC 360-22: Table N5.4-2 and Table C-N5.4-2

TASK INSPECTION TYPE DESCRIPTION

12. Welding Procedures

Specification followed OBSERVE Settings on welding equipment

Travel speed Selected welding materials Shielding gas type/flow rate Preheat applied

1 PERFORM: Perform these tasks for each weld, fastener, or bolted connection, and required verification.

OBSERVE: Observe these items on a random sampling basis daily to ensure that applicable requirements are met. Operations need not be delayed pending these inspections at contractor’s risk.

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