What is the difference between a hold point and a witness point?

A hold point requires the inspector's sign-off before work can continue — the contractor cannot proceed without that authorization. A witness point means the inspector is notified and may observe, but work can proceed if the inspector doesn't show up. Hold points are mandatory checkpoints; witness points are advisory. Which applies to a given operation is typically defined in the project's QC plan or contract documents.

Is a CWI required on every AWS D1.1 structural welding job?

AWS D1.1 requires inspection by a 'qualified welding inspector.' An AWS-certified CWI satisfies this requirement by default. Some jurisdictions accept documented equivalent qualifications, but CWI certification is the standard of care for most structural work. The contract documents or AHJ may impose stricter requirements.

What documents must a CWI verify at fit-up?

At fit-up the CWI should verify: the applicable WPS is current and covers the joint, fit-up dimensions match the qualified joint detail, base metal identification matches the WPS, preheat has been applied if required by the WPS or code, and filler metal is properly stored (low-hydrogen electrodes in a rod oven or sealed container).

How should hold-point sign-offs be documented?

Each hold point should generate a dated, signed entry in an inspection record — whether a paper traveler, a digital QC form, or a welding software audit record. The documentation should identify the joint or weld number, the inspector's name, the date and time, and the finding. Vague entries like 'passed' without a reference to the specific WPS or joint detail are inadequate for third-party audits.

Weld inspection hold points: CWI tasks at each stage

What a CWI must verify at fit-up, during welding, and at final inspection on structural steel jobs under AWS D1.1:2025. Hold-point tasks and documentation tips.

A CWI's signature at the end of a job is only as defensible as the hold-point record behind it. Signing off on a stack of completed welds without documented pre-weld, in-process, and final checks gives auditors — and plaintiff's attorneys — nothing to work with if a weld later fails.

This article lays out the hold points AWS D1.1:2025 and sound QC practice require, and what documentation each checkpoint should produce.

Why hold points matter beyond compliance

Hold points exist because some defects are undetectable after the fact. A bad fit-up hidden under completed weld passes can't be found by final visual inspection. Root pass lack-of-fusion is buried under fill and cap passes. Preheat not applied before the first pass affects the HAZ microstructure in ways that finished-weld inspection won't catch.

The three-checkpoint model — pre-weld, in-process, final — gives the inspector intervention opportunities before defects get buried. It also creates a documented chain of custody that separates a well-run QC program from a rubber-stamp sign-off operation.

Checkpoint 1: Pre-weld / fit-up hold point

The pre-weld hold point is the highest-leverage inspection in the sequence. Time spent here prevents rework that runs three to ten times more expensive after welding is complete.

WPS verification: Confirm the WPS on the traveler or weld map covers the joint being made. Check: process matches production practice, base metal specification matches the material on the floor, filler metal classification matches what's in the welder's hand, and the WPS is the current revision. A superseded WPS on the floor is a nonconformance regardless of whether the weld would have been physically identical. For a detailed pre-weld WPS review checklist, see CWI WPS review checklist.

Joint fit-up: Measure root opening, included angle (for groove welds), and joint alignment. Compare to the tolerances in the WPS or prequalified joint detail. Common violations: excessive root opening that exceeds the maximum qualified, missing or improperly tacked backing, and out-of-tolerance bevel angles. Document the actual measured dimensions, not just "OK."

Base metal identification: Verify the material cut mark or MTR (mill test report) matches the specification on the WPS. On mixed-specification jobs — say, A36 and A572 Grade 50 on the same structure — mismatched material is a real risk. If the shop's cutting tickets and material tracking are unreliable, flag it before the weld is made.

Preheat: If the WPS or code requires preheat, measure and record the actual temperature before the arc is struck. Use a calibrated contact thermometer or temperature-indicating crayon. "Felt warm" is not a preheat record. See preheat and interpass temperature on a WPS for minimum preheat thresholds and measurement practice.

Filler metal storage: Low-hydrogen SMAW electrodes must be stored in a rod oven at 250–300°F [120–150°C] or in sealed manufacturer containers with issued-within-4-hours time limits. Check the oven temperature log and confirm the electrodes on the welder's belt match the WPS classification.

Checkpoint 2: In-process hold point

In-process inspection is often skipped under schedule pressure. It is the checkpoint most likely to catch defects that will not show on final inspection and will not pass NDE.

Root pass inspection: Before fill passes begin, visually inspect the root pass for cracks, incomplete fusion, and excessive convexity or concavity. On CJP groove welds where back-gouging is specified, verify the gouge reached sound metal before the back pass is deposited.

Interpass temperature: Maximum interpass temperature is a WPS-required variable. On high-restraint joints and higher-CE steels, exceeding interpass temperature affects toughness properties and can drive hydrogen into the weld. Measure and record interpass temperature at intervals appropriate to the preheat risk — heavier preheat requirements warrant more frequent checks.

Pass sequence and bead placement: For multipass welds, verify the welder is following the sequence described in the WPS. Sequence violations change residual stress distribution and can cause cracking in restrained joints. On joints with specific pass-count requirements (often called out on complex WPS for thick material), count the passes and document.

Electrode and wire control: Confirm the welder hasn't substituted a different electrode classification mid-joint. A welder switching from E7018-H4 to E7018 (non-H4 designation) mid-weld changes the hydrogen potential in a way that isn't visible and won't show on final visual inspection.

Checkpoint 3: Final visual inspection

Final visual inspection is governed by AWS D1.1 acceptance criteria for visual inspection. The criteria cover:

Weld size: Verify fillet weld leg dimensions meet the minimum required by the design drawing. Undersized fillet welds are the single most common final visual deficiency. Use a weld gauge — not eyeballing.

Weld profile: Check for excessive convexity (stress concentration at toes), excessive concavity (throat deficiency), overlap, and undercut. AWS D1.1 sets specific depth limits for undercut based on orientation and base metal thickness.

Cracks: Any visible crack is cause for rejection. Crater cracks at weld terminations are common on SMAW and FCAW; they must be ground out and repaired.

Arc strikes: Arc strikes outside the weld zone are a rejectable surface condition. They create local hard spots, particularly on ASTM A514 and other alloy steels. Verify the area is ground smooth and inspected for cracking.

Porosity: Surface-breaking porosity is rejectable above the size and frequency limits in D1.1. Below-surface porosity requires NDE to detect.

Document findings on a joint-by-joint basis. "Visually acceptable — all welds" is an inadequate record. See welding procedure library and audit-ready documentation for how to structure inspection records that hold up under scrutiny.

NDE coordination

When NDE is required — UT, MT, PT, or RT — the CWI typically interfaces with the NDE Level II or III to ensure:

NDE is performed after the weld has cooled to the minimum temperature specified (typically 14 days for UT on some high-restraint applications is conservative, but immediate NDE on hot welds produces false results)
The NDE technician has the applicable acceptance criteria for the code and contract
NDE reports cross-reference the joint identifier on the weld map and the WPS used

For a full picture of how NDE documentation integrates with the WPS and audit packet, see NDE documentation and audit packets.

Tying it together: the audit packet

An AISC Quality Certification audit or third-party structural audit will ask for inspection records that trace each weld to a WPS, a qualified welder, and a documented inspection. Hold-point records are the backbone of that chain. They show the audit examiner that the inspection program operated in real time, not reconstructed from memory after the job was done.

See what a complete digital QC and inspection record system looks like.