Welding

Before welding, refer to construction drawings and specifications, seismic
restraint submittals, and manufacturer’s instructions.

Attaching equipment to embedded plates: Plates are embedded in the concrete during the floor or wall pour. Plates are firmly held in place while the concrete is poured to maintain proper alignment and position. The size and location of the plate can be determined from construction drawings. See Figure 149 (below) for weld locations.

Step 1: Determine the weld material, shape, and dimensions for each piece

Step 2: Fit the material to ensure proper weld joint preparation

Step 3: Clean the surfaces

Surfaces must be dry and free of galvanized coating, hotdipped or rust inhibitor, paint, scale, rust, oil, grease, water, and other foreign material for a minimum of one inch from the estimated toe of the weld.

Step 4: Weld the materials

The weld must be as prescribed in the welding procedure specifications (WPS).

WPS for shop and field pre-qualified weld joints and weld joints qualified by test must be prepared for review and approval before fabrication. All welding procedure items such as base metals, welding processes, filler metals and joint details that meet the requirements of AWS D1.1 Section 5.1 will be considered as prequalified. Any change or substitution that is beyond the range or tolerance or requirements for pre-qualification will be qualified by test pre-AWS D1.1 Section 5 part B.

DO NOT WELD OVER PAINT. You may paint after welding has cooled to room temperature.

Step 5: Inspect the weld

Make sure the surface is free of slag, dirt, grease, oil, scale, or other contaminants.

Welds cannot have cracks. Adjacent layers of weld metal and base metal must be thoroughly fused together.

All craters must be filled to the full cross-section except outside the effective weld length.

Underrun must not exceed 1/16”. Undercut must not exceed 1/16” for any 2” per 12” weld or 1/32” for the entire weld.

Surfaces must be free of coarse ripples, grooves, abrupt ridges and valleys. The faces of fillet welds must be flat or slightly convex.