The welding inspector certification on a project specification determines which inspectors qualify for the work. AWS CWI (Certified Welding Inspector) and CSWIP 3.1/3.2.2 (Certification Scheme for Welding and Inspection Personnel) are the two most widely recognized welding inspection certifications in the world. They do not have the same acceptance in every market.
This article compares the two certifications, explains where each is accepted and by whom, and covers why dual certification removes geographic barriers for both inspectors and the clients who deploy them.
AWS CWI: North American Standard
The AWS Certified Welding Inspector (CWI) is issued by the American Welding Society. The CWI examination is a composite of three parts: a written examination covering welding fundamentals and inspection knowledge, a practical examination on code book lookup (using a designated code such as AWS D1.1), and a visual examination testing ability to identify weld defects in specimen welds.
CWI certification requires a minimum combination of education and welding or inspection experience before the candidate is eligible to sit the examination. The specific experience requirements depend on the candidate's highest level of education.
The AWS Senior Certified Welding Inspector (SCWI) is the advanced tier above CWI. It requires at least 6 years as a CWI plus 15 years total welding-related experience, demonstrated supervisory and engineering competence, and passing a more comprehensive examination. The number of SCWIs worldwide is significantly smaller than the CWI population.
CWI is the dominant welding inspection certification in the United States and Canada. Canadian codes (CSA W59, CSA W47.1) reference CWI or CWB certification. ASME codes reference AWS B2.1 and Section IX, which CWIs are trained on.
CSWIP: International Standard
CSWIP (Certification Scheme for Welding and Inspection Personnel) is administered by TWI Certification Ltd, part of TWI (The Welding Institute) in the UK. CSWIP is accredited by UKAS to ISO/IEC 17024, the international standard for personnel certification bodies.
CSWIP includes multiple levels of welding inspector certification. The most relevant for oil and gas inspection are:
- -CSWIP 3.1 (Welding Inspector): Entry-level welding inspector certification. Requires minimum experience and passing the CSWIP 3.1 written and practical examinations. Comparable to CWI in scope.
- -CSWIP 3.2.2 (Senior Welding Inspector with Radiographic Interpretation): Senior level requiring additional experience and demonstration of radiographic film interpretation capability. Widely specified in the Middle East and international markets for inspection of radiographed welds.
CSWIP 3.2.2 is the specific level that carries maximum recognition in international markets. It is more commonly specified than CSWIP 3.1 for oil and gas fabrication inspection outside North America because it includes the radiographic interpretation component relevant to RT weld inspection programs.
AWS CWI vs CSWIP: Direct Comparison
| Factor | AWS CWI / SCWI | CSWIP 3.1 / 3.2.2 |
|---|---|---|
| Issuing body | American Welding Society (AWS) | TWI Certification Ltd (UK) |
| Accreditation | Not accredited to ISO/IEC 17024 | UKAS accredited to ISO/IEC 17024 |
| Certification basis | Experience + examination | Experience + written + practical examination |
| Radiographic interpretation | Not included in standard CWI; separate RT qualification required | Included in CSWIP 3.2.2 |
| Primary regional acceptance | North America; internationally recognized but not always specified | Europe, Middle East, Asia, Australasia; widely specified in international tenders |
| Code alignment | AWS D1.1, ASME Section IX, API 1104 | BS EN ISO standards, AWS, ASME |
| Major operator preference | North American operators: Shell Canada, CNRL, Suncor | Global: Shell (global), BP, TotalEnergies, Aramco, ADNOC, Petronas |
CWB Level 2: The Canadian Context
In addition to CWI and CSWIP, the Canadian Welding Bureau (CWB) operates its own inspection certification program. CWB Level 2 is the qualification required for welding inspectors on CSA-coded structural and pressure work in Canada. For bridge welding under CSA S6, CWB certification is mandatory.
CWB Level 2 covers both inspection competency and familiarity with Canadian standards (CSA W47.1, CSA W48, CSA W59, CSA W186). For work in Canada, particularly where Canadian structural or pressure codes apply, CWB Level 2 is often required in addition to or instead of CWI.
Holding all three, CWI (or SCWI), CSWIP 3.2.2, and CWB Level 2, covers the full North American and international welding inspection certification landscape. This triple certification is rare and eliminates any credentialing barrier regardless of where the project is located or which codes apply.
Market Acceptance: A Practical View
For North American projects (Canada and the US): CWI and CWB Level 2 cover the vast majority of work. CSWIP is not commonly specified domestically but is not rejected when presented.
For Middle East projects (Saudi Arabia, UAE, Kuwait, Oman, Qatar): CSWIP 3.2.2 is frequently specified. AWS CWI holders sometimes encounter the requirement to demonstrate radiographic interpretation capability separately, because CWI does not include film reading by default. CSWIP 3.2.2 holders satisfy the combined welding inspection and RT interpretation requirement in a single certificate.
For international projects from Canadian EPCs and operators: Most major Canadian EPCs and operators working on international projects align their inspection requirements with the project host country or the major operator's requirements. For projects with Shell, BP, or TotalEnergies, CSWIP tends to be the specified certification.
For Asian projects (Malaysia, Singapore, South Korea, India): CSWIP is widely specified. CWI is recognized but CSWIP is the preferred international certification in these markets.
Norman QC Welding Inspection Credentials
Norman QC holds AWS Senior Certified Welding Inspector (SCWI), CSWIP 3.2.2 (Senior Welding Inspector with Radiographic Interpretation), and CWB Level 2 certification. This combination covers welding inspection requirements for North American projects (AWS SCWI + CWB Level 2) and international projects in the Middle East, Europe, Asia, and Australasia (CSWIP 3.2.2).
The SCWI credential, held by a significantly smaller number of inspectors than the basic CWI, demonstrates advanced supervisory and engineering competency beyond the inspection technician level. SCWI holders can develop inspection programs, review and interpret complex welding procedures, and provide expert opinions on welding quality disputes.
For welding inspection work on any project requiring any combination of these certifications, contact for scope and availability.
FAQs
Does holding CWI automatically qualify an inspector for CSWIP projects?
No. CWI and CSWIP are separate certification schemes issued by different bodies against different standards. Holding CWI does not grant CSWIP certification, and vice versa. Each must be separately earned. Inspectors who hold only CWI may be rejected for tender consideration on projects that specify CSWIP, particularly in the Middle East where CSWIP 3.2.2 is a common mandatory requirement.
What is the renewal requirement for CSWIP?
CSWIP certification must be renewed at 5-year intervals. Renewal requires evidence of continued professional activity in welding inspection during the certification period. Unlike PCN NDT renewal, CSWIP renewal does not automatically require re-examination, but a lapse in certification followed by reinstatement may require additional assessment depending on the length of lapse.
Is radiographic interpretation knowledge required for all welding inspectors?
It depends on the project. For projects where RT is the primary volumetric NDE method and the welding inspector is expected to evaluate radiographic film, the ability to interpret radiographs is a requirement. CSWIP 3.2.2 includes this capability. AWS CWI does not inherently include formal RT film reading qualification, though many CWIs also hold ASNT Level II or III RT certification which covers this.