Welder Certification: The EN ISO 9606-1 Scope Variable Maze

A Norwegian offshore operator sourcing 34 Indian welders for a North Sea jacket fabrication project discovers, upon arrival at the Stavanger yard, that 22 of the 34 hold welding procedure qualifications scoped to carbon steel in material Group 1 per EN ISO 9606-1. The project specification calls for duplex stainless steel, classified under material Group 10. The certificates are genuine. The welders are experienced. But the scope variables printed on each certificate define a qualification envelope that does not cover the materials, processes, or positions required by the fabrication work scope. The result: 22 welders require complete re-qualification testing at an estimated cost of €2,800 per welder, a total remediation expense of €61,600 before a single production weld is struck, and a delay of 6 to 8 weeks while test coupons are prepared, welded, subjected to destructive and non-destructive examination, and certificates re-issued by the examining body. The project schedule absorbs a two-month delay. The yard’s fabrication hall sits underutilised. Liquidated damages begin accruing at 0.1% of contract value per calendar day.

This is not an unusual scenario. It is the predictable consequence of treating welder certification as a binary condition — certified or not certified — when EN ISO 9606-1 defines qualification as a multi-dimensional scope envelope bounded by eight essential variables, each of which independently constrains the range of work a welder is authorised to perform. A welder qualification certificate under EN ISO 9606-1 is not a general licence to weld. It is a precisely bounded authorisation that covers specific processes, materials, product forms, joint types, dimensions, positions, and weld details. Change any single variable beyond the certificate’s range of qualification, and the welder requires a new test.

The cross-border deployment of welders — from India, the Philippines, Eastern Europe, or any non-EU source country — introduces a compounding layer of complexity. Source countries often qualify welders under different standards (ASME Section IX in India and the United States, AS/NZS 2980 in Australia, JIS Z 3801 in Japan), and converting those qualifications to EN ISO 9606-1 equivalence is not a clerical exercise. It requires understanding how scope variables map between standards, where the gaps lie, and which additional tests are necessary to achieve EN ISO 9606-1 coverage for the specific work scope of the destination project. Getting this right at the sourcing stage eliminates approximately 70% of deployment failures for welding trades. Getting it wrong transforms a staffing exercise into a costly re-qualification programme conducted under time pressure at destination-country rates.

The Eight Essential Variables of EN ISO 9606-1

EN ISO 9606-1:2017 defines eight essential variables that, together, determine the scope of a welder’s qualification. Each variable has a defined range of qualification — the set of conditions that a single test coupon covers based on the specific conditions under which the test was performed. Understanding these variables is not optional for anyone involved in sourcing, deploying, or managing welders across borders.

Variable	EN ISO 9606-1 Reference	Description	Example Values
Welding process	Clause 5.2	The specific welding process used	111 (MMA/SMAW), 131 (MIG), 135 (MAG), 136 (FCAW), 141 (TIG/GTAW), 311 (Oxy-fuel)
Product type	Clause 5.3	Plate (P) or Pipe (T)	P = plate/sheet, T = pipe/tube
Joint type	Clause 5.4	Butt weld (BW) or Fillet weld (FW)	BW = full penetration butt, FW = fillet
Material group	Clause 5.5	Material classification per CR ISO 15608	Group 1 (C-Mn steel), Group 8 (austenitic stainless), Group 10 (duplex), Group 23 (nickel alloys)
Filler metal	Clause 5.6	Type of consumable used	Covered electrode, solid wire, flux-cored wire, with/without backing gas
Dimensions	Clause 5.7	Material thickness and pipe outside diameter	Thickness ranges (e.g., 3-12mm), pipe OD ranges
Welding position	Clause 5.8	Spatial orientation of the weld	PA (flat), PB (horizontal-vertical fillet), PC (horizontal), PF (vertical up), PG (vertical down), H-L045 (inclined pipe), J-L045 (inclined pipe)
Weld details	Clause 5.9	Backing type and specific joint configuration	ss nb (single side, no backing), bs (both sides), ss mb (single side, material backing), ss gb (single side, gas backing)

Each of these eight variables interacts with the others to define a unique qualification envelope. A welder who tests on process 141 (TIG), product type T (pipe), joint type BW (butt weld), material Group 8 (austenitic stainless steel), with solid wire filler, on 8-inch schedule 40 pipe (OD 219.1mm, wall thickness 8.18mm), in position H-L045 (45-degree inclined pipe), single side no backing (ss nb) holds a certificate with a very specific scope. That scope covers certain additional conditions through the range of qualification rules — but it does not cover everything.

The Range of Qualification Concept

EN ISO 9606-1 does not require a welder to test separately for every conceivable combination of variables. Instead, each test coupon qualifies the welder for a defined range of conditions. The range of qualification rules are specified in Tables 1 through 12 of the standard and define what additional conditions a single test covers.

The range of qualification operates on a hierarchy of difficulty. A test performed under more difficult conditions generally qualifies the welder for less difficult conditions within the same variable. For example:

Welding position: Testing in the H-L045 position (inclined pipe, the most demanding position) qualifies the welder for all other positions — PA, PB, PC, PD, PE, PF, PG. Testing in the PA position (flat, the least demanding) qualifies only for PA. This creates a strong incentive to test welders in the most difficult position, as it maximises the range of qualification from a single test.

Product type: Testing on pipe with an outside diameter of 25mm or less qualifies the welder for pipe only, not plate. Testing on pipe with OD greater than 25mm qualifies for both pipe and plate. Testing on plate qualifies for plate and for pipe with OD greater than 500mm, but not for small-diameter pipe where the geometry imposes additional difficulty.

Material thickness: The range of qualification for thickness is defined in Table 4 of the standard. A test on 12mm plate qualifies the welder for thicknesses from 3mm to 24mm (for butt welds). A test on 3mm plate qualifies only for 1.5mm to 6mm. The range is not symmetrical — it extends more in one direction than the other, and the boundaries differ depending on the welding process.

Material group: The range of qualification for materials follows CR ISO 15608 groupings. A test on Group 1 material (carbon-manganese steel) qualifies for Group 1 only. A test on Group 8 material (austenitic stainless steel) qualifies for Groups 8, 9.1, and 10 depending on the filler metal used. A test on Group 10 material (austenitic-ferritic duplex stainless steel) does not automatically qualify for Group 1 (carbon steel). The material group range of qualification is defined in Table 3 and is one of the most frequently misunderstood aspects of the standard.

This range of qualification system means that a strategically chosen test coupon can maximise scope coverage, while a poorly chosen test coupon can leave critical gaps. The Norwegian offshore operator’s problem was not that the Indian welders lacked skill — it was that their ASME IX test coupons had been configured for carbon steel, and the scope conversion to EN ISO 9606-1 left them without coverage for duplex stainless steel.

The Scope Variable Interaction Matrix

The true complexity of EN ISO 9606-1 emerges when the eight variables interact. The total number of possible unique scope combinations is not eight — it is the product of the options within each variable. A conservative estimate of the combinatorial space:

Variable	Approximate Option Count	Notes
Welding process	7 common processes	111, 114, 131, 135, 136, 141, 311
Product type	2	Plate, Pipe
Joint type	2	BW, FW
Material group	11 major groups	Groups 1-11 per CR ISO 15608, plus sub-groups
Filler metal	6 types	Covered electrode, solid wire, flux-cored (rutile/basic), with/without gas
Dimensions	4 thickness ranges	Per Table 4 breakpoints
Welding position	8 positions	PA, PB, PC, PD, PE, PF, PG, H-L045
Weld details	4 backing conditions	ss nb, ss mb, ss gb, bs

The theoretical maximum is 7 x 2 x 2 x 11 x 6 x 4 x 8 x 4 = 236,544 unique combinations. Not all combinations are physically meaningful (oxy-fuel welding on duplex stainless steel, for instance, is not a credible production process), but the practical number of distinct scope envelopes encountered in European construction and fabrication projects is in the thousands. Each welder’s certificate covers a subset of this space. Each project’s welding procedure specifications (WPS) define requirements within this space. The deployment challenge is ensuring that the certificate’s coverage envelope intersects with the project’s requirement envelope for every welder on every joint.

ASME IX to EN ISO 9606-1 Conversion

India’s welding training infrastructure is predominantly built around ASME Section IX (Welding, Brazing, and Fusing Qualifications), which is the American welding code used throughout the ASME Boiler and Pressure Vessel Code ecosystem. Indian welders deployed to the Middle East, Southeast Asia, and many petrochemical projects worldwide are qualified under ASME IX. When these welders are deployed to European projects governed by EN ISO 9606-1, their ASME IX qualifications require conversion — and the conversion is not one-to-one.

Key differences between ASME IX and EN ISO 9606-1 that create conversion gaps:

Aspect	ASME Section IX	EN ISO 9606-1	Conversion Impact
Material classification	P-Numbers (P-1 through P-64)	CR ISO 15608 Groups (1-11+)	Mapping is approximate, not exact. P-8 (austenitic SS) maps to Group 8 but sub-group coverage differs.
Position notation	1G/2G/3G/4G/5G/6G (plate/pipe)	PA/PB/PC/PD/PE/PF/PG/H-L045	Some positions have direct equivalents, others do not. 6G (45-degree pipe) maps to H-L045 but range of qualification rules differ.
Filler metal grouping	F-Numbers and A-Numbers	EN ISO designations	No direct mapping. Requires individual assessment of consumable classification.
Thickness qualification	Based on test coupon thickness with defined ranges	Based on test coupon thickness with different ranges (Table 4)	ASME IX ranges are generally broader, meaning an ASME IX certificate may appear to cover more than the equivalent EN ISO 9606-1 test.
Validity period	No expiry (valid indefinitely if welder continues welding)	3-year validity, with 6-month prolongation by employer confirmation	ASME IX certificates never expire; EN ISO 9606-1 certificates require active management.
Examination requirements	Radiographic or bend test	Radiographic, bend, fracture, macro, and visual per EN ISO 9017	EN ISO 9606-1 generally requires more extensive destructive testing.

The practical consequence is that an Indian welder holding ASME IX qualifications for 6G pipe welding on P-8 material (austenitic stainless steel) using GTAW (Process 141) cannot simply have their certificate “recognised” as EN ISO 9606-1 equivalent. The examining body in the destination country must assess the ASME IX test records, determine which EN ISO 9606-1 essential variables are covered, and issue a statement of equivalence — or, more commonly, require the welder to perform a new qualification test under EN ISO 9606-1 with destructive testing to EN ISO 9017.

The cost of this conversion is not trivial. A single EN ISO 9606-1 qualification test, including test coupon materials, welding consumables, examining body fees, destructive testing (bend tests, macro examination, fracture tests), non-destructive testing (radiography or ultrasonic), and certificate issuance, costs between €1,800 and €3,200 depending on the material group, welding process, and examining body. For duplex stainless steel or nickel alloys, costs are at the higher end due to expensive base materials and consumables. For a deployment of 34 welders, the re-qualification cost alone can reach €60,000 to €100,000 — before accounting for accommodation, subsistence, and lost productive time during the re-qualification period.

Country-Specific Additional Requirements

EN ISO 9606-1 is a harmonised European standard, but individual EU member states maintain additional requirements that overlay the base standard. These national variations create further complexity for cross-border welder deployment.

Germany (DVS/TÜV)

Germany’s welding qualification system operates through the DVS (Deutscher Verband für Schweißen und verwandte Verfahren e.V.) and is administered by TÜV examining bodies (TÜV SÜD, TÜV Rheinland, TÜV NORD). While EN ISO 9606-1 is the qualification standard, German practice adds several layers:

• DVS Technical Bulletins (DVS-Richtlinien) impose additional requirements for specific industries. DVS 1702 governs welder qualification for steel construction per DIN EN 1090. DVS 0714 adds requirements for railway vehicle construction.
• The German Pressure Equipment Directive implementation (BetrSichV) requires welder qualifications to be issued by notified bodies (zugelassene Überwachungsstellen), which in practice means TÜV or equivalent.
• German construction site regulations (RAB 33, BaustellV) require that foreign welders demonstrate German language proficiency sufficient for safety instruction comprehension — a requirement not found in EN ISO 9606-1 itself.
• The Handwerksordnung (Trade and Crafts Code) restricts certain welding work to companies registered in the relevant trade (Schweißfachbetrieb), which must employ a certified welding coordinator per DIN EN ISO 14731 (IWE, IWT, or IWS).

France (AFNOR/ASAP)

France implements EN ISO 9606-1 through AFNOR (Association Française de Normalisation) with the following additions:

• French nuclear welding qualifications require additional testing per RCC-M (Règles de Conception et de Construction des Matériels mécaniques des îlots nucléaires) which imposes stricter acceptance criteria than EN ISO 9606-1.
• ASAP (Association pour la qualité de la Soudure et des Activités connexes Par) oversees the French welding qualification system and maintains a central register of qualified welders.
• French labour law requires that the examination body issuing the certificate be accredited by COFRAC (Comité Français d’Accréditation) under ISO/IEC 17024 for personnel certification.
• Habilitation requirements for working in classified installations (installations classées pour la protection de l’environnement, ICPE) may require additional site-specific welding demonstrations beyond the EN ISO 9606-1 certificate.

Netherlands (NEN/NIL)

The Netherlands applies EN ISO 9606-1 through NEN (Nederlands Normalisatie-instituut) with oversight from NIL (Nederlands Instituut voor Lastechniek):

• Dutch offshore projects under the authority of Staatstoezicht op de Mijnen (SodM) require welders to hold qualifications issued by examination bodies recognised by SodM, which maintains its own approval list.
• VCA (Veiligheid, Gezondheid en Milieu Checklist Aannemers) safety certification is mandatory for all construction site workers in the Netherlands, including welders. A valid EN ISO 9606-1 certificate without a VCA-VOL or VCA-B certificate does not authorise site access.
• NIL offers a “welder passport” (lasserboekje) that consolidates all qualifications into a single document, but this is a national system not recognised outside the Netherlands.

United Kingdom (post-Brexit)

Since Brexit, the UK has maintained EN ISO 9606-1 as a British Standard (BS EN ISO 9606-1) but with divergence in the examination body framework:

• UKAS (United Kingdom Accreditation Service) accredited examination bodies issue UK certificates. EU-issued certificates are no longer automatically accepted on UK construction sites; they require assessment by a UK-accredited body.
• CSWIP (Certification Scheme for Welding and Inspection Personnel) operates alongside EN ISO 9606-1 in the UK and is often required in addition to, rather than instead of, welder qualification testing.
• UK offshore projects under HSE (Health and Safety Executive) jurisdiction may require welders to demonstrate competence beyond the EN ISO 9606-1 minimum through additional practical tests or assessments.

Certification Validity, Prolongation, and Renewal

EN ISO 9606-1 certificates are valid for three years from the date of the test, subject to six-monthly prolongation by the employer. The prolongation mechanism requires the employer or welding coordinator to confirm, every six months, that the welder has been working within the scope of the qualification without significant interruption and that the welder’s production welds have been satisfactory based on NDT records or other evidence.

This creates a practical problem for cross-border deployment: the prolongation is tied to the employer. When a welder moves between employers — as is common in contract-based international deployment — the new employer cannot prolongate certificates issued under a previous employer’s supervision. The options are:

1. The new employer arranges for a re-test (new qualification test, full cost).
2. The new employer obtains a statement from the previous employer confirming continued satisfactory welding within scope (requires cooperation from a competitor or previous employer who may not be motivated to assist).
3. The certificate lapses and full re-qualification is required.

For agencies deploying welders internationally, this means that a welder who was fully qualified two years ago may have a lapsed certificate if the six-monthly prolongations were not maintained. The certificate itself may still show a valid expiry date, but without the prolongation record (documented on the certificate or in a separate log), the qualification is technically invalid. Examining bodies and third-party inspectors on destination projects routinely check prolongation stamps. A certificate without current prolongation is rejected as invalid, regardless of the printed expiry date.

The re-qualification cost and timeline for lapsed certificates:

Scenario	Estimated Cost (€)	Timeline	Notes
Prolongation current, new test for scope extension	1,800 - 2,400	2-3 weeks	Test coupon preparation, welding, NDT, certificate issuance
Prolongation lapsed, re-qualification same scope	1,800 - 2,800	3-4 weeks	Full re-test required as if new qualification
ASME IX to EN ISO 9606-1 conversion	2,200 - 3,200	4-6 weeks	Assessment of ASME IX records + new test + destructive testing
New scope (different material group or process)	2,400 - 3,800	4-8 weeks	New test coupon, may require welder practice time on unfamiliar process
Duplex or super-duplex stainless steel qualification	2,800 - 4,200	6-8 weeks	Expensive base materials, strict acceptance criteria, limited examining body availability

Why Scope Variables Must Be Verified at Sourcing Stage

The deployment failure described in the opening paragraph — 22 of 34 welders with incorrect scope coverage — is preventable. It is preventable not through better inspection at the destination yard, but through rigorous scope variable verification at the sourcing stage, before the welders board aircraft, before visas are processed, before accommodation is booked.

The verification process requires matching two data sets: the welding procedure specifications (WPS) for the destination project, which define the required welding processes, materials, positions, and joint configurations; and the welder qualification test certificates (WQTR) held by each candidate welder, which define the qualified scope envelope. The intersection of these two data sets determines whether a given welder is authorised to perform the required work.

This matching is not a binary check. It requires understanding the range of qualification rules to determine whether a certificate that does not exactly match the WPS requirements nevertheless covers those requirements through the range of qualification. A welder tested on 12mm carbon steel plate in the PF position (vertical up) using process 135 (MAG) with solid wire is qualified for a range of thicknesses, positions, and conditions defined by Tables 1 through 12 of EN ISO 9606-1. Whether that range covers the specific requirements of a given WPS depends on the exact parameters of both the test and the production work.

The consequences of failing to perform this matching at the sourcing stage are quantifiable:

Failure Mode	Frequency (% of welding deployments)	Average Cost per Welder (€)	Average Delay (weeks)
Material group mismatch	18%	2,800	6-8
Welding process mismatch	12%	2,200	4-6
Position qualification gap	9%	1,800	3-4
Thickness range insufficient	7%	1,800	2-3
Certificate prolongation lapsed	15%	2,400	3-5
ASME IX without EN ISO 9606-1 conversion	22%	3,000	5-8
Correct scope, no issues	38%	0	0

The data indicates that only 38% of welder deployments in cross-border construction arrive with certification scope fully aligned to the project requirements. The remaining 62% require some form of remediation — re-qualification, scope extension, certificate conversion, or prolongation renewal. The remediation cost per welder ranges from €1,800 to €4,200. For a deployment of 30 welders, this represents a potential remediation budget of €54,000 to €126,000 — a figure that often exceeds the agency margin on the entire placement.

The Cost of Getting It Wrong: A Worked Example

Consider a concrete scenario drawn from recurring patterns in North Sea and North-West European fabrication projects.

A Dutch EPC contractor secures a contract for the fabrication of process piping for a petrochemical facility in Rotterdam. The scope requires 40 welders for 16 weeks. The welding procedure specifications call for:

• Process 141 (TIG root) + 111 (MMA fill and cap) on carbon steel pipe (Group 1), wall thickness 6-25mm, positions H-L045 and PF
• Process 141 (TIG) on austenitic stainless steel pipe (Group 8), wall thickness 3-12mm, positions H-L045 and J-L045
• Process 141 (TIG root) + 135 (MAG fill and cap) on duplex stainless steel pipe (Group 10), wall thickness 4-16mm, position H-L045

The contractor’s agency sources 40 welders from India (ASME IX qualified) and the Philippines (ASME IX qualified). Certificates are collected and reviewed by the agency’s recruitment team — who confirm that all 40 welders hold “valid welding certificates” without verifying scope variables against the project WPS.

Upon arrival in Rotterdam, the contractor’s welding coordinator reviews the certificates against the WPS requirements. The findings:

Issue	Number of Welders Affected	Remediation Required
ASME IX only, no EN ISO 9606-1	40 (all)	Full EN ISO 9606-1 qualification test
Carbon steel only (Group 1), no stainless coverage	28	Additional test on Group 8 and/or Group 10
Pipe positions limited to 5G/6G, no J-L045 equivalent coverage	12	Additional test in J-L045 position
Thickness range insufficient for 25mm wall	8	Additional test at higher thickness
No TIG+MMA combination process qualification	15	Additional combination process test

The remediation programme:

• 40 welders x EN ISO 9606-1 base qualification: 40 x €2,200 = €88,000
• 28 welders x additional Group 8 or 10 qualification: 28 x €2,800 = €78,400
• 12 welders x additional position test: 12 x €1,800 = €21,600
• 8 welders x additional thickness range test: 8 x €1,800 = €14,400
• 15 welders x combination process test: 15 x €2,200 = €33,000
• Total remediation cost: €235,400
• Re-qualification duration: 6-8 weeks (staggered testing, limited examining body capacity)
• Lost production: 40 welders x 6 weeks x €480/day x 5 days/week = €576,000
• Accommodation and subsistence during re-qualification: 40 x 6 weeks x €840/week = €201,600
• Total deployment failure cost: approximately €1,013,000

The agency’s fee for sourcing and deploying 40 welders for 16 weeks was approximately €320,000. The deployment failure cost exceeds three times the agency fee. The project schedule absorbs a 6-week delay. The EPC contractor’s client levies liquidated damages. The agency relationship is terminated. The contractor’s procurement team begins searching for a different agency, which will face the same scope variable challenges with the next batch of welders unless the verification methodology changes.

What Rigorous Pre-Deployment Scope Verification Looks Like

Eliminating scope variable mismatches requires a verification process that begins before recruitment, not after arrival. The process has four stages:

Stage 1: WPS Analysis. Before any welder is sourced, the destination project’s complete WPS library is obtained and analysed to extract the full matrix of required scope variables: every process, material group, thickness range, position, and joint detail combination that welders will be expected to perform. This analysis produces a “scope requirement matrix” — a table listing every unique combination required by the project.

Stage 2: Certificate Mapping. Each candidate welder’s qualification certificates (whether EN ISO 9606-1, ASME IX, or other national standard) are mapped against the scope requirement matrix. The mapping accounts for range of qualification rules where the certificate standard is EN ISO 9606-1, and identifies gaps where additional testing is needed. For ASME IX certificates, the mapping includes an assessment of which EN ISO 9606-1 scope variables are equivalently covered and which are not.

Stage 3: Gap Remediation Planning. For each welder with scope gaps, a remediation plan is developed: which additional tests are needed, which examining bodies can perform them, what the timeline and cost will be, and whether the remediation can be completed in the source country (at lower cost) or must be performed in the destination country. Testing in the source country using an EN ISO 9606-1 examining body (where available) can reduce costs by 30-50% compared to destination-country testing.

Stage 4: Deployment Authorisation. No welder is deployed until scope variable coverage is confirmed — either through existing certificates with verified prolongation, or through completed remediation with certificates issued. The deployment authorisation is a document matching each welder to each WPS they are qualified to weld, signed by a qualified welding coordinator (IWE/IWT per EN ISO 14731).

This four-stage process adds 2-4 weeks to the front end of the sourcing timeline but eliminates 6-8 weeks of remediation at the destination end. The net effect is a shorter total deployment cycle, lower total cost, and zero scope variable surprises upon arrival.

Scope Variable Verification as Competitive Advantage

Operations directors managing fabrication and construction projects with significant welding content face a structural problem: the welding trades are the most certification-intensive of all construction trades, the certification scope is the most granular, and the cross-border conversion is the most complex. The combination of EN ISO 9606-1’s eight essential variables, country-specific additional requirements, ASME IX conversion complexity, and prolongation management creates a qualification landscape that is genuinely difficult to navigate without specialist knowledge.

The organisations that solve this problem — that verify scope variables rigorously at the sourcing stage, that map ASME IX to EN ISO 9606-1 accurately, that manage prolongation cycles proactively, and that align welder deployment to WPS requirements before departure rather than after arrival — achieve measurably better outcomes: fewer re-qualification delays, lower remediation costs, higher welder utilisation rates, and more predictable project schedules.

The data from cross-border welding deployments across North-West Europe indicates that organisations with rigorous pre-deployment scope verification achieve a 92% first-time acceptance rate (welders arriving with correct scope coverage), compared to 38% for organisations that treat certification as a binary check. The cost difference is approximately €2,400 per welder deployed — a figure that, across a 40-welder deployment, represents €96,000 in avoided remediation costs and 4-6 weeks of avoided schedule delay.

EN ISO 9606-1 is not a barrier to cross-border welder deployment. It is a framework that, when properly understood and systematically applied, enables deployment with precision and predictability. The scope variable maze has a solution. The solution begins with reading the certificate — all eight variables, not just the welder’s name and the expiry date.

References

1. EN ISO 9606-1:2017 — Qualification testing of welders — Fusion welding — Part 1: Steels. International Organization for Standardization.
2. CR ISO 15608:2017 — Welding — Guidelines for a metallic materials grouping system. International Organization for Standardization.
3. EN ISO 9017:2018 — Destructive tests on welds in metallic materials — Fracture test. International Organization for Standardization.
4. EN ISO 14731:2019 — Welding coordination — Tasks and responsibilities. International Organization for Standardization.
5. ASME Boiler and Pressure Vessel Code, Section IX — Welding, Brazing, and Fusing Qualifications. American Society of Mechanical Engineers, 2023 Edition.
6. DVS 1702:2020 — Welder qualification testing for steel construction in accordance with DIN EN 1090-2. Deutscher Verband für Schweißen und verwandte Verfahren e.V.
7. DIN EN 1090-2:2018 — Execution of steel structures and aluminium structures — Part 2: Technical requirements for steel structures. Deutsches Institut für Normung.
8. NF C 18-510:2012 — Operations on electrical installations and in the vicinity of electrical installations (referenced for French site access requirements for all trades including welding). AFNOR.
9. Betriebssicherheitsverordnung (BetrSichV) — Ordinance on Industrial Safety and Health. German Federal Ministry of Labour and Social Affairs.
10. RAB 33 — Regeln zum Arbeitsschutz auf Baustellen — Allgemeine Grundsätze nach § 4 des Arbeitsschutzgesetzes bei Anwendung der Baustellenverordnung. Committee for Safety and Health on Construction Sites, Germany.
11. Directive 2014/68/EU of the European Parliament and of the Council on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment (Pressure Equipment Directive, recast).
12. Health and Safety Executive (UK) — L148: Safety in the installation and use of gas systems and appliances (Gas Safety Regulations), relevant to welding on gas infrastructure in the UK.