Industrial Inspection Services

"Welding Procedure Test Approval" refers to the process of confirming the compatibility of the materials to be welded and the welding filler materials to be used, based on tests required by standards.

The commonly used term PQR is an abbreviation for "Procedure Qualification Record". Welding method testing is supervised according to the standards and WPS (Way Testing Systems) you define. Non-destructive and destructive testing are performed in accredited laboratories.

The primary cause of hot cracking is metallic compounds with low melting points, formed by elements such as sulfur and phosphorus, which tend to accumulate at grain boundaries. If these compounds are present in the weld seam or the area exposed to heat, they diffuse towards the grain boundaries and cause cracking as the weld seam cools and tensile stresses build up.

To achieve resistance to the risk of hot cracking, it is recommended that the ferrite content in the structure be at least 4%. The presence of ferrite can be reliably determined using magnetic measuring instruments calibrated according to AWS A.4.2.
The aim is to determine the amount of ferrite (iron) accurately and non-destructively, using the magnetic induction method, in production, delivery, or in the laboratory.

In manufacturing and product inspections, it is determined whether the dimensions, qualities, or performance of a finished product, semi-finished product, part, or raw material conform to predetermined specifications.

Within the scope of our TÜRKAK TS EN ISO 17020 Accreditation, for projects to be manufactured according to the TS EN ISO 1090-2 standard;

• Contract Control,

• Checking the Compliance of Welding Procedure Specifications (WPS),

• Planning and Monitoring of Sourcing Procedure Approvals (WPQR)

• Monitoring the Certification of Welders in Accordance with the Project.

• Construction Control, Planning and Monitoring of Inspections,

• Inspection and Control of Welded Fabrications

• Manufacturing Planning (Work Orders, Compression and Welding Arrangements, Welding Sequence Plans, Inspection Requirements),

• Subcontractor Compliance Checks,

• We provide services in areas such as material control and tracking (main materials, consumables).

Here are some examples of reasons why Welder Certification, WPS, and WPQR certifications are mandatory and required:

The relevant regulations include the Pressure Equipment Directive (PED), EN 12952, EN 12953, CE Certification, EN 303-1-3, EN 3834, EN 1090-1, EN 1090-2, EN 15085-2, Tanker and Trailer Design Approval Instructions, TS EN 10217-2, EN 1090-1, and EN 1090-2.

In vacuum testing, butt, overlap, and corner weld joints in tanks or similar parts requiring leak-proof sealing are inspected by utilizing an artificial pressure difference created in the welded area. Using a foaming liquid, a pressure difference is created in the welded area by a vacuum device, causing bubbles to form in the defective area and allowing for the visual detection of the defect.

Non-destructive testing (NDT) must be carried out under the supervision of mechanical engineers holding a Level 2 certificate in accordance with the TS EN ISO 9712 standard for the qualification and certification of personnel.

For vacuum tests to yield reliable and accurate results, the procedures must be carried out in accordance with standards.

Assembly checks are the process of verifying whether manufactured parts are assembled in accordance with the project, technical drawings, and relevant standards. This includes:

• Ensuring the parts are positioned correctly and aligned with the axis.

• Checking the fit and tightness of fasteners (bolts, nuts, pins, etc.).

• Accuracy of welded and/or bolted joints

• Tolerance, alignment, and clearance checks.

• Detection of surface suitability and assembly defects.

Factors such as these are examined. The aim is to ensure that the final product functions properly, safely, and in accordance with standards.

PMI is a portable and rapid testing method that provides chemical analysis and identification of materials without damaging them. Elements such as Ti, V, Mn, Co, Fe, Cu, Zn, Ni, Se, Nb, and Mo are detected using PMI. It helps determine the composition of a material and the percentage of elements present. PMI is also widely used to check the compatibility of the base material with the filler material.

• All alloys can be measured.

• It is applied as a control measure in material procurement.

• Applicable everywhere.

• Provides the ability to record measurement results numerically.

It is widely used in applications such as weld and weld root inspection, spherical and cylindrical tank inspection, system leaks, surface crack inspection, and plumbing inspection.

It is used for visual inspection of inaccessible areas.

We provide this service with personnel who hold visual inspection certificates according to ASNT and/or EN standards.

This includes ensuring that bolted fabrications of all diameters are properly torqued or that the torque level is checked according to the EN 1090-2 standard.

The inspection principle is based on marking the nut portion of tightened bolts on the base material and the nut itself, and then adjusting the torque meter to the desired torque values (EN 1090-1 or Customer Specification) to inspect the nut.

If the angle between the markings is less than 30°, the torque is within the acceptable values. If it is between 30° and 45°, two more bolts from the same group should be checked. If an angle greater than 45° is detected, the bolt should be replaced and two more bolts from the same group should be checked.