Continuity Log for Welders: ISO 9606-1 Template, 6-Month Rule

A welder continuity record is the document that proves an individual welder has remained active within the scope of their ISO 9606 qualification — continuously, without interruption beyond the standard’s defined thresholds. It is not a certificate. It is an ongoing log, updated at defined intervals, that sits between the initial qualification test and the expiry or renewal event.

For quality managers and welding coordinators, the continuity record is often the single most common gap found during customer or third-party audits. The qualification certificate looks fine. The welder worked regularly. But no one kept the log.

This guide covers what the record must contain, how ISO 9606-1 frames the continuity requirement, a practical template, and the most frequent mistakes that silently invalidate a qualification.

Welder Log, Welding Log Sheet, or Continuity Record? Same Document, Different Names

Different shops use different labels for this exact document: “welder log,” “welding log sheet,” “welder activity record,” and “continuity record” all show up in quality manuals describing the same thing — the dated evidence trail that proves a welder stayed active in a process. ISO 9606-1 does not name the document; it only names the requirement (continuous, demonstrable activity, confirmed at set intervals). Whichever label your organization uses is a local convention, not a compliance distinction.

What matters is not what you call it but what it is not. A welder log or continuity record is not the same document as the original Welder Qualification Test Record — the one-time proof from the initial test — and it is not the same as a Welding Procedure Specification (WPS) or Procedure Qualification Record (PQR), which describe the process parameters rather than the person executing them. Confusing these documents is a common audit finding: an auditor asks for continuity evidence and is handed the original qualification certificate again, with no record of activity since.

A related but distinct document is a weld traceability log — the per-weld record of who welded what, when, and on which joint, often the raw production data a digital welder qualification tracking system captures automatically. A continuity record is the summarized, dated confirmation extracted from that raw activity — one row per confirmation event per welder per process, not one row per weld. The distinction between welder qualification itself — the certified competence — and the log that keeps that competence provable over time is worth keeping straight in your own procedure, whichever name you settle on.

What ISO 9606-1 says about continuity

ISO 9606-1 is the foundational standard for qualification testing of welders in fusion welding — specifically for steels. The series also covers aluminium (ISO 9606-2), copper (ISO 9606-3), nickel (ISO 9606-4), and titanium (ISO 9606-5).

The standard defines qualification validity in two linked concepts:

The 6-month activity rule

A welder must have used the relevant welding process within the previous 6 months. This is the minimum continuity window. If a welder stops using a specific process for more than 6 months, the qualification for that process lapses — regardless of whether the 2-year formal period is still open.

This rule is the most commonly misunderstood. The 2-year formal period does not automatically protect a welder who rotated out of a process for a seasonal project gap. Activity must be demonstrable at every 6-month checkpoint.

The 2-year reconfirmation cycle

ISO 9606-1 requires confirmation of welder qualification at intervals not exceeding 2 years. This confirmation may come from:

• A re-test (full or partial)
• Or documented evidence that the employer is satisfied with the welder’s work in service — typically through production records — increasingly generated automatically by real-time weld monitoring — NDT reports, visual inspection records, or a responsible welding coordinator (RWC/IWE/IWT) statement

The employer’s documented confirmation at 2 years is the main route for most production operations. The continuity record is the log that makes this confirmation audit-defensible.

That production evidence is easier to generate at scale when it’s captured as a byproduct of the weld itself. HeatCore AI logs a timestamped, pass/fail evidence pack for every weld pass from real-time thermal monitoring, which gives the confirming person exactly the kind of production record ISO 9606-1 accepts — without a manual compilation exercise at each review. See how it works in the HeatCore AI live view.

Under ISO 3834, welder qualification and continuity records are part of the documented evidence required by the welding quality management system. The ISO 3834 and EN 1090 audit checklist covers how continuity records map to welding QMS audit requirements.

ISO 9606-1 vs ISO 9606-2 (and the Rest of the Series): One Continuity Record, or Several?

ISO 9606-1 only covers fusion welding of steels. A welder qualified under ISO 9606-1 for GMAW on carbon steel has no standing qualification for aluminium, copper, nickel, or titanium under this part of the series alone — those materials sit under ISO 9606-2, -3, -4, and -5 respectively, each a separate standard with its own qualification test and, by extension, its own continuity requirement.

This matters directly for the continuity record, because continuity is scoped to the qualification, not to the welder as a person. A welder holding both an ISO 9606-1 qualification (steel, say GMAW 135) and an ISO 9606-2 qualification (aluminium, GMAW 131) is carrying two independent qualifications that happen to sit on the same person. Each has its own 6-month activity window, but the revalidation interval past that window is not shared across the series: ISO 9606-2 through -5 run a 2-year confirmation cycle, while ISO 9606-1 follows whichever of the three routes its clause 9.3 sets at the time of qualification — retest, periodic volumetric-NDT evidence, or continuing confirmation under an ISO 3834-2/-3 verified employer — the confirmation and prolongation route each part sets, not a single flat interval. And — critically — activity on one part does not preserve the other. Six months of steady aluminium welding under ISO 9606-2 does nothing to keep an ISO 9606-1 steel qualification alive if that welder has not touched a steel joint in the same window.

In practice, this means your continuity log needs a column — or a separate log entirely — per standard part, not just per process code, whenever a welder is dual-qualified across materials. A shop running mixed steel and aluminium fabrication should treat “process” in the continuity table as shorthand for “process + material group + standard part,” because 135 on steel and 131 on aluminium are not interchangeable evidence even though they share a welding process family.

Before assigning a welder to a joint that crosses this boundary, confirm the exact scope against the ISO 9606-1 standard reference — which part of the series and which range of approval actually applies — rather than assuming a general “qualified welder” status covers the material in front of them. The ISO 9606-1 range-of-qualification checker walks through the process, material group, thickness and position variables that determine whether a specific joint sits inside an existing qualification’s range — the same check that should trigger a continuity-record split when the answer crosses into a different part of the series.

What the record must contain

ISO 9606-1 does not prescribe a specific form. It defines the informational requirements. Your continuity record must capture enough data to answer a single auditor question: “How do you know this welder’s qualification is still valid today?”

A compliant record needs:

The record is a living log, not a one-time document. Each 6-month checkpoint and each 2-year confirmation should produce a new dated entry, not overwrite the previous one.

Continuity record template

Below is a minimal working template you can adapt to your QMS format. Each row represents one confirmation event.

Welder name: ________________ ID: ________________

Certificate reference: ________________ Issuing body: ________________

In the example above, the SMAW (111) process has been suspended because no production activity was recorded in the preceding 6-month window. The welder would need a re-test or a short production sample under supervision to reinstate it.

Common mistakes that invalidate continuity

1. Confusing certificate validity with continuity

A certificate issued 18 months ago is still within its 2-year window — but if the welder did not use the process in the last 7 months, the qualification is lapsed. These are independent checks. Always verify both.

2. Recording only renewals, not intermediate confirmations

Some operations create a new continuity record only when the 2-year confirmation is due. This leaves gaps. An auditor can ask for evidence of activity at the 6-month points, not just at year 2. If you have no log for those intermediate periods, you cannot prove continuity.

3. Using collective entries for multiple welders

“All welders active on project X” is not a valid continuity record. Each welder must have individual, identified entries linked to their certificate number. Collective records fail during audits that pull a specific welder’s history.

4. Listing process codes that do not match actual work

If your continuity record lists 136 (FCAW-M) but the welder was actually running 138 (FCAW-B), the record does not confirm continuity for 138. Scope alignment between what is recorded and what was performed is critical.

5. No confirming person identified or role unclear

The ISO 9606-1 confirmation relies on the employer being satisfied. That means a named individual with a defined responsibility for weld quality — not just an anonymous QA stamp. IWE, IWT, EWT, or the documented RWC of record are appropriate roles.

Integrating continuity records into your QMS

Decide who owns the record

In most operations, the welding coordinator or quality manager owns the record. The decision matters because it determines who is accountable when a gap appears. Assign ownership explicitly in your quality plan or procedure.

Set review triggers, not just review dates

Calendar-based reviews (“first Monday of each quarter”) work in stable teams. For operations with rotating shifts, project-based assignments, or seasonal peaks, event-based triggers are more reliable: every time a welder starts a new project type, every time a process goes unused for 3+ months, every time a qualification is about to reach its 12-month mark.

Link continuity to assignment control

The continuity record is most powerful when it is directly connected to production assignment decisions. Before a welder is assigned to a joint that requires a specific process, position, or material group, the system should confirm their qualification is active for that exact scope. This is where digital welder qualification tracking eliminates manual risk.

Preserve historical records

ISO 3834 and EN 15085 both require traceability of welder qualifications through the life of the product. For pressure vessels, railway components, and structural elements, this may mean keeping records for 10+ years. Design your filing system for retrieval, not just storage: indexed by welder ID, process, and date range.

Paper vs digital: what changes in the record itself

The continuity record can be a signed paper form, an Excel workbook, or a field in a welding QMS. The format is not the requirement — the content and date integrity are.

What digital systems add:

• Automatic calculation of next review due dates
• Alerts when a process approaches the 6-month inactivity threshold
• Automatic status change from Active to At Risk to Suspended based on activity data
• Exportable evidence packs for audits

What they cannot replace:

• The judgment of the confirming person, who must evaluate whether the production work performed is representative of the qualification scope
• The physical signature or authenticated entry that makes the confirmation legally traceable

For operations with more than 10–15 active welders across multiple processes, the administrative overhead of a manual system almost always leads to gaps. The digital tracking approach does not change what the standard requires — it changes whether you can reliably meet it at production scale. Explore our product family to see how monitoring and QMS tools capture this evidence automatically.

Key standards references

• ISO 9606-1:2012+AMD1:2017 — Qualification testing of welders: fusion welding, steels
• ISO 9606-2 through 9606-5 — Series extensions for aluminium, copper, nickel, titanium
• ISO 3834-2:2021 — Quality requirements for fusion welding of metallic materials: comprehensive requirements
• EN 15085-2:2020 — Railway applications: welding of railway vehicles, requirements for welding manufacturer
• EN ISO 14731:2019 — Welding coordination: tasks and responsibilities

External references:

• ISO 9606-1 standard page
• IIW qualification system overview
• AWS welder certification guidance

Therness solution: Welding parameter monitoring — Current, voltage, wire feed and gas recorded per weld, as WPS/PQR and heat-input evidence.

Written by Luca Santoro , founder