CTI Inspection provides Structural Steel Inspection and WPS/PQR (Welding Procedure Specification / Procedure Qualification Record) approval services for industrial structures, steel construction projects, stadiums, and bridges, in compliance with EN 1090, ISO 3834, and ASME standards. We certify the quality of your welding—from the manufacturing phase through to the assembly site—in accordance with international standards.

Our Structural Steel and Welding Inspection Services

WPS and PQR Preparation & Welding Procedure Qualification

Preparation of Welding Procedure Specifications (WPS) and execution of Welding Procedure Qualification Record (PQR / WPQR) tests, conducted by expert engineers accredited by TÜRKAK.

EN 1090 and ISO 3834 Structural Steel Fabrication Inspection

CE marking for steel structures, EN 1090-2 (EXC1–EXC4) fabrication inspections, Factory Production Control (FPC), and compliance checks for ISO 3834 quality requirements for welded fabrication.

Welder Qualification and Certification (EN ISO 9606)

Qualification of your welders through theoretical and practical examinations in accordance with EN ISO 9606-1 (steel) and EN ISO 9606-2 (aluminum) standards.

Construction Site and Field Assembly Inspections (Torque & Bolting Control)

Third-party inspection of steel connection points—including torque-controlled bolting, blast cleaning/paint thickness measurements, and the quality of on-site assembly.

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Frequently Asked Questions (FAQ)

1. What are WPS and PQR, and what is the difference between them?
A WPS (Welding Procedure Specification) is a technical instruction that describes, step-by-step, how a weld is to be performed. A PQR (Procedure Qualification Record) is a laboratory test report that verifies a procedure's compliance with standards and its mechanical strength.

2. For which companies is EN 1090 certification mandatory?
EN 1090 CE certification is mandatory for all steel construction manufacturers that export structural steel and aluminum components to European Union countries, or that carry out manufacturing for projects in Türkiye falling under the scope of the Construction Products Regulation.

3. Are WPS/PQR approvals from CTI Inspection internationally valid?
Yes, CTI Inspection holds TÜRKAK ISO 17020 accreditation. The approved WPS/PQR documents are internationally recognized under EN, ISO, and ASME standards.