Welder Qualification vs Welding Procedure Qualification

Welder qualification and welding procedure qualification are easy to confuse. Both involve a test weld and a recognised standard, and both end in a certificate that sits in your quality file. Because the two processes look alike from the outside, many businesses treat them as one thing, or assume that holding one covers the other.

That mix-up causes real problems. A tender asks for qualified procedures and you only hold welder certificates. An auditor finds coded welders working to a WPS that was never properly qualified. A new contract starts, and production waits while the missing paperwork gets sorted.

This guide sets out what each qualification proves, when you need one, the other or both, and the mistakes that most often trip businesses up.

The Short Answer

Welder qualification tests the person. It proves that an individual welder can produce sound welds to a defined standard, within a set range of process, material, position and thickness.

Welding procedure qualification tests the method. It proves that a specific welding procedure, meaning the combination of process, material, joint design, position and parameters, produces welds with the required mechanical and metallurgical properties.

One answers "Can this welder do the job?" The other answers "Does this way of welding work?" On most regulated or contract-controlled work, you need a yes to both.

	Welder qualification	Welding procedure qualification
What is tested	The welder's skill	The welding method
Question it answers	Can this person produce sound welds?	Does this procedure produce sound welds?
Common names	Coded welding, welder approval, WPQ	WPQR, PQR, procedure approval
Main documents	Welder qualification certificate	pWPS, WPQR/PQR and approved WPS
Common standards	BS EN ISO 9606, ASME Section IX, BS 4872	BS EN ISO 15614, BS EN ISO 15613, ASME Section IX
Who it is tied to	An individual welder	Your business's welding method
What keeps it valid	Expiry dates and continuity of welding	Staying within the qualified range
When it changes	New process, material or position outside the welder's approved range	New process, material or joint type outside the procedure's approved range

What a Welder Qualification Proves

A welder qualification is independently witnessed evidence that a named welder can produce sound welds to a specific standard. In everyday language this is often called coded welding, and a welder who holds current approval is known as a coded welder.

The important word is range. A welder qualification never approves someone to weld anything, anywhere. It records exactly what they are approved to do, including:

• Parent material group
• Welding process
• Welding position
• Thickness range
• Pipe diameter, where relevant

During the test, the welder produces a test piece under the relevant standard while it is witnessed. The finished weld is then examined and tested, typically starting with visual inspection before moving to non-destructive or destructive testing, depending on the code. At Rambaldini Welding, test pieces from our welder qualifications service are examined at a UKAS accredited laboratory, and the certificate states the approved range in plain terms.

The standard you qualify to depends on the material and the work. Common routes include:

• BS EN ISO 9606-1 to -5 for fusion welding of steels, aluminium, copper, nickel and titanium alloys
• BS EN ISO 14732 for welding operators and weld setters on mechanised and automated equipment
• ASME Section IX for welding, brazing and fusing qualifications, often specified on pressure work
• BS 4872 Parts 1 and 2 for welder approval where an approved welding procedure is not required
• BS EN ISO 13585 for brazers and brazing operators
• BS ISO 24394 and BCAR A8-10 for aerospace work

That BS 4872 entry is worth noting. It is one of the few situations where a welder approval is designed to stand on its own, without a qualified procedure behind it.

What a Welding Procedure Qualification Proves

Welding procedure qualification moves the focus from the welder to the method. It proves that a particular way of welding, with defined parameters, consistently produces a weld fit for purpose.

The process runs through three documents, and this is where most of the acronym confusion comes from:

1. pWPS (Preliminary Welding Procedure Specification). Your draft. It sets out the intended parameters before anything has been formally tested. It is a proposal, not an approval.
2. WPQR or PQR (Welding Procedure Qualification Record / Procedure Qualification Record). The formal record showing the procedure has been tested and qualified against the relevant standard. It ties together the test piece, the results and the approved range of application.
3. WPS (Welding Procedure Specification). The approved instruction your welders follow in production, backed by the qualification testing behind it.

Put simply: the pWPS proposes, the WPQR/PQR proves, and the WPS instructs.

A common trap is to treat any document headed "WPS" as an approved procedure. A WPS only carries weight when a valid WPQR/PQR stands behind it. Without that evidence, it is still just a proposal, however professional it looks.

Standards for procedure qualification include BS EN ISO 15614 (all parts), BS EN ISO 15613 for qualification based on a pre-production welding test, ASME BPVC Section IX, BS ISO 17779 for brazing procedures, and BS EN ISO 15609 for the WPS itself. Our weld procedure qualification service covers the full sequence from pWPS through to approved WPS, including UKAS accredited documentation to meet the requirements of PESR, PSSR and third party verified certification for the PED (2014/68/EU).

Why Many Jobs Need Both

On regulated work, the two qualifications form a chain of evidence. A proven procedure in the hands of an unqualified welder leaves a gap. So does a coded welder working to a method nobody has proven. Clients, insurers and auditors look for both links.

Here is how that plays out in practice.

Tendering for contract work. Many clients and codes require qualified procedures before production starts, and coded welders to carry them out. A business that holds both sets of records can show capability straight away. Well-prepared procedure documentation also signals a serious commitment to quality, which strengthens a bid.

Passing a client or third party audit. An auditor will usually check that each welder's approved range covers the work they are doing, and that each WPS in use is supported by a valid WPQR/PQR. If either record is missing, out of date or outside its range, the audit flags a gap.

Introducing a new material or process. Say your team has worked on carbon steel and you win work involving stainless or aluminium. That change can fall outside both your existing procedure qualification and your welders' approved range. You may need a new procedure qualified and your welders tested to match.

Running a quality management system. A QMS that requires documented welder approval will also expect documented, qualified procedures where the work demands them. Keeping both current keeps your system defensible.

In each case, the question is not "Which one do we need?" but "Which records does this specific job require, and do ours cover it?"

Where Training Fits In

Training is a separate step from both qualifications, and it is often the missing piece.

Welder training builds the skill. Welder qualification proves the skill to a standard. Procedure qualification proves the method that skilled welder will follow.

If a welder is new to a process, struggling with recurring defects, or preparing for a coding test on an unfamiliar material, practical welder training shaped around the actual joints and materials they will face makes the qualification test far more likely to go smoothly. Training on its own does not make someone a coded welder. The coded status comes from the independently witnessed test.

Common Mistakes and Points of Confusion

Assuming a coded welder means the procedure is approved. A welder's certificate says nothing about whether your welding method has been qualified. These are separate records.

Working to an unsupported WPS. A WPS drafted in-house but never backed by a WPQR/PQR will not satisfy an auditor on regulated work.

Ignoring the approved range. Both qualifications only cover what was tested. A welder qualified in one position or thickness range is not automatically approved for another. The same applies to a procedure.

Letting welder approvals lapse. Welder qualifications carry expiry dates, and many depend on continuity of welding between renewals. Under BS EN ISO 9606, for example, a qualification usually needs confirming at regular intervals. Missed confirmations can quietly invalidate a certificate long before its final date. Our welder qualification renewal service tracks expiry dates and sends reminders so approvals do not slip.

Qualifying more than you need. The opposite problem. Testing outside the scope of your actual work adds cost without adding value. Confirming the correct standard and range before any testing begins avoids this.

Relying on internal sign-off alone. Independent witnessing carries more weight with clients, insurers and regulators, because it removes any suggestion of internal bias.

Getting Your Records Right First Time

Rambaldini Welding Services was founded in 2016 by Jake Rambaldini, an experienced welder, and is run as a family business alongside fellow director Kerry Rambaldini. Because our team comes from a hands-on welding background, we look at qualification through the lens of the work you actually do, not just the paperwork. We were named Best Welder Training and Qualification Provider 2024 at the SME News UK Enterprise Awards and are a Central England Prestige Awards 2024/25 winner. We operate under an ISO 9001 certified management system and are members of the Northamptonshire Chamber of Commerce. You can find out more about our team and background.

If you are unsure whether your next contract needs welder approval, procedure qualification or both, we will confirm the right standard and range before any testing begins, so you only pay for what you need. Call 01327 879500 or get in touch through our contact page to talk it through.