WPS
Welding Procedure Specification
Verification can include whether the correct approved procedure is available for the production weld being inspected.
Dilenza provides welding inspection services in China for industrial equipment, pressure systems, piping, structural steel, shipbuilding, marine fabrication and other welded products manufactured at Chinese suppliers.
We match welding inspectors according to the equipment, materials, welding processes, applicable standards, required qualification, supplier location and inspection responsibilities.
Whether you need an inspector for one critical welding stage or recurring surveillance throughout fabrication, Dilenza can review the requirement and identify a technically suitable profile.
ITP · WPS · Specification · Drawing · PO accepted
Qualifications
AWS CWI · CSWIP 3.1 · CSWIP 3.2 · IWI · Relevant NDT Qualifications
Attendance
Single Visit · Recurring · Resident · Multi-Site

Welding inspection support
Welding quality cannot be effectively verified only when fabrication is complete.
Important requirements are established and controlled throughout the manufacturing process—from welding documentation and material preparation to fit-up, production welding, NDT, repairs and final acceptance.
Dilenza provides independent welding inspectors who can attend your Chinese supplier according to the controlled project documentation and defined inspection responsibilities.
Inspection may support:
The objective is not simply to place a welding certificate at the factory. It is to provide an inspector with the right qualification and relevant experience for the actual welded equipment.
The certificate confirms qualification. The equipment determines suitability.
The exact scope should come from the project's ITP, specification, drawings and applicable welding requirements. Depending on the assignment, inspection can cover activities before, during and after welding.
The inspector may verify project-defined requirements relating to:
The purpose is to identify deviations before welding progresses beyond a stage where correction becomes more difficult.
Depending on the inspection scope, surveillance can include:
Recurring surveillance can be particularly useful where production continues over several days or weeks and welding quality needs to be monitored throughout fabrication.
Post-weld inspection can include:
Acceptance must follow the applicable project standard and controlled documentation, not generic workmanship expectations.
Where required by the ITP, welding inspection can be coordinated with project-defined non-destructive examination.
The welding inspector's responsibility can include reviewing or witnessing activities according to the agreed scope, verifying the status of examination and following identified weld repairs.
Repair follow-up may include:
NDT execution should be performed by personnel holding the qualifications required by the applicable project documentation.
Welding quality begins before production welding starts.
Depending on the agreed scope, the inspector may verify the status and applicability of welding documentation such as:
WPS
Verification can include whether the correct approved procedure is available for the production weld being inspected.
PQR / WPQR
Where included in the scope, documentation can be checked against the applicable project requirements and the WPS being used.
WPQ
The inspector can verify that the welder identification and qualification correspond to the production welding activity according to the project-defined requirements.
Inspection may also verify traceability between:
The exact documentation requirements depend on the applicable code, client specification and project quality plan.
Welding documentation only adds value when it matches what is actually happening on the fabrication floor.
The required welding-inspection qualification should be defined by the client, project specification or applicable contractual requirements. Depending on the project, Dilenza can review profiles holding qualifications such as:
Often requested for projects operating under AWS requirements or where the purchaser specifically requires CWI certification.
Commonly requested for international fabrication, oil and gas, marine, structural and EPC projects.
IWI-qualified profiles can be considered where required by the project.
Where relevant, welding inspector profiles may also hold qualifications or experience related to VT, PT, MT, UT, RT interpretation and other project-specified NDT methods.
Qualification alone is not the final selection criterion. Dilenza can also consider:
Two inspectors may both hold CSWIP 3.1 or AWS CWI certification and still be suited to very different assignments.
An inspector experienced in structural steel may not be the right profile for a pressure vessel. A shipbuilding welding inspector may have very different fabrication experience from someone working primarily on process piping.
Duplex stainless steel, heavy-wall pressure equipment, large tubular structures or automated welding can introduce further experience requirements. Dilenza therefore reviews the actual welding application before proposing profiles.
01 — You send
Supplier Location · Equipment · Materials · Welding Process · ITP · Standard · Qualification · Dates
02 — We review the welding requirement
We identify the appropriate qualification, equipment experience, material experience, welding experience and project responsibility.
03 — We match profiles
Suitable profiles can be considered according to certification, relevant projects, location, availability and assignment duration.
04 — You review
Relevant inspector CVs and qualifications can be submitted for technical assessment.
05 — Inspection
The confirmed inspector attends the supplier according to the agreed welding inspection scope.
Pressure Vessels · Heat Exchangers · Columns · Tanks · Boilers · Process Equipment
Welding inspection can support fabrication stages involving:
The inspector profile should reflect the equipment, materials and applicable pressure-equipment requirements.
Process Piping · Pipe Spools · Skids · Manifolds · Fabricated Piping Systems
Inspection requirements may involve:
Projects can require one attendance or repeated surveillance throughout spool fabrication.
Steel Structures · Frames · Modules · Platforms · Pipe Racks · Heavy Welded Assemblies
Welding inspection can support:
Hull Structures · Vessel Blocks · Marine Structures · Offshore Modules · Deck Equipment · Marine Fabrication
China's shipbuilding supply chain involves extensive welded fabrication across large vessel structures and marine equipment. Welding inspection may support:
Marine experience can form an important part of welding-inspector selection.
Heavy Machinery · Mechanical Assemblies · Fabricated Equipment · Equipment Frames · Welded Components
Industrial machinery may combine structural fabrication with machined interfaces and mechanical assembly. Welding inspection can focus on the welded fabrication while other technical disciplines address mechanical or dimensional requirements where necessary.
Power Equipment · Renewable Energy Structures · Energy Systems · Fabricated Project Packages
Inspection can support welding activities on equipment and structures manufactured for conventional and renewable-energy projects. The required inspector profile should follow the specific equipment and project requirements rather than the industry name alone.
The welding inspector's relevant experience may need to reflect both the materials and welding processes involved.
Depending on the project, this can include experience with materials such as:
and processes such as:
Not every inspector needs experience with every process. The objective is to match the profile to your actual manufacturing requirement.
Chinese manufacturers supply welded equipment for projects operating under many different codes and specifications.
The applicable welding requirements therefore depend on the equipment, destination, purchaser and controlled project documentation. Depending on the assignment, requirements may reference:
Often relevant to structural and project-specific welded fabrication.
Commonly encountered in pressure-equipment and process-piping projects.
May form part of oil, gas, pipeline or equipment specifications.
Depending on the project and destination market.
Shipbuilding projects may also reference requirements from applicable classification societies or marine project specifications.
Chinese GB / GB/T standards may apply where identified by the controlled project documentation.
The correct standard, edition, quality level, acceptance criteria and inspector responsibility must always be confirmed from the project documents.
Do not assume a welding standard simply because fabrication takes place in China.
Explore Standards & CodesDilenza can review welding inspection requirements throughout China's major fabrication and manufacturing areas. Important regions can include:
Shanghai · Jiangsu · Zhejiang
Shipbuilding · Pressure Equipment · Machinery · Structural Fabrication
Qingdao · Yantai · Shandong
Marine · Heavy Fabrication · Energy Equipment · Industrial Structures
Tianjin · Hebei
Steel · Heavy Industry · Pressure Equipment · Machinery
Dalian · Liaoning
Shipbuilding · Marine Fabrication · Heavy Machinery
Guangdong
Equipment Manufacturing · Machinery · Fabricated Industrial Products
Wuhan & Central China
Steel · Energy · Machinery · Industrial Fabrication
Chengdu · Chongqing
Machinery · Energy Equipment · Advanced Manufacturing
Inspection can also be reviewed in other Chinese manufacturing locations according to the supplier address and required technical profile.
Supplier location determines mobilization. Welding requirements determine the inspector.
The required level of welding inspection depends on the manufacturing program.
For one defined activity such as:
Repeated welding inspection throughout fabrication. Suitable where important welding activities occur across several manufacturing stages. Recurring attendance can help maintain visibility over:
Frequent or continuous welding-inspection presence at the supplier for longer fabrication programs. Resident coverage can help maintain continuity across:
Structured inspector rotations for long manufacturing programs where continuous coverage is required.
Welding inspection coordinated across several Chinese fabrication facilities or suppliers. Particularly useful where one project includes different welded packages manufactured in different regions.
Final inspection alone may identify visible problems, but it cannot recreate manufacturing stages that are no longer accessible.
Once welding is complete:
Recurring welding surveillance provides independent visibility while these activities are actually taking place. For technically critical fabrication, this can provide considerably more useful project information than relying only on a final visual inspection.
Inspect the welding process while the evidence still exists.
Depending on the agreed scope, Dilenza welding inspection reports can document:
Reporting should provide the project team with a clear technical record of what was inspected, what was observed and what remains open.
We review the actual welded equipment, materials, processes, standards and inspection responsibilities before selecting the inspector.
Requirements can include profiles holding AWS CWI, CSWIP, IWI and relevant NDT qualifications.
Relevant inspector CVs and qualifications can be submitted for technical assessment before confirmation.
Requirements can be reviewed across China's main fabrication and heavy-manufacturing regions.
Support can range from one critical welding stage to recurring, resident or multi-site inspection.
Chinese suppliers can manufacture according to international purchaser, EPC and project requirements.
The right welding inspector for the actual fabrication—not simply the nearest available profile.
This service covers welding-specific technical inspection. If your requirement is broader, the following services may be more suitable.
For broader manufacturing surveillance involving mechanical assembly, FAT, documentation and other non-welding disciplines:
For surface preparation, environmental conditions, coating application and dry-film-thickness inspection:
For multidisciplinary third-party inspection, manufacturing coverage and general information about inspection across China:
This separation allows each inspection discipline to be matched to the correct technical profile.
You do not need to prepare a long specification before contacting us.
Send whatever information is already available.
Not sure which welding-inspector qualification applies? Send us the equipment, supplier location and project documentation and we can review the requirement.
Yes. Welding inspection requirements can be reviewed throughout China's main industrial and fabrication regions according to the supplier location, equipment, required qualification, technical scope and inspector availability.
Yes. AWS CWI-qualified profiles can be reviewed where the qualification is required by the client or project. Relevant equipment and fabrication experience should also form part of inspector selection.
Yes. Depending on project requirements, profiles holding CSWIP 3.1 or CSWIP 3.2 can be considered together with relevant industry and equipment experience.
Yes. International Welding Inspector profiles can be reviewed where IWI qualification is required for the assignment.
Where included within the agreed inspection scope, welding documentation such as the WPS, procedure qualification records and welder qualifications can be reviewed against the controlled project requirements.
Yes. Welding inspection can support pressure-vessel and process-equipment fabrication according to the applicable ITP, project standards and qualification requirements.
Yes. Welding inspection can support structural steel, modules, platforms, frames and other heavy welded assemblies.
Yes. Profiles with relevant shipbuilding and marine fabrication experience can be reviewed for vessel structures, ship blocks, offshore modules and marine equipment.
Yes. Requirements can be reviewed throughout Shanghai and Jiangsu, including major fabrication and shipbuilding areas such as Nantong, Suzhou, Wuxi, Changzhou and Nanjing.
Yes. Shandong is particularly relevant to marine, energy, machinery and heavy-fabrication projects.
Yes. Dalian and the wider northeast industrial region are particularly relevant to shipbuilding, marine fabrication and heavy machinery.
Yes. Welding inspection requirements can be reviewed for heavy industry, steel fabrication, pressure equipment and industrial manufacturing in Tianjin and surrounding areas.
Yes. Welding inspection requirements can be reviewed throughout Guangdong according to the equipment, fabrication scope and required inspector profile.
Where defined by the client's ITP, welding inspectors can witness or review the status of project-defined NDT activities according to the agreed responsibilities. NDT execution must be performed by appropriately qualified personnel where required.
Requirements involving NDT qualifications can be reviewed according to the examination method, applicable standard and project responsibilities.
Yes. Where included in the scope, the inspector can follow identified weld repairs through preparation, re-welding, re-examination and close-out.
Yes. Repeated attendance can be arranged around fabrication stages such as fit-up, production welding, NDT and repairs.
Yes. Resident inspection can support long fabrication programs requiring frequent or continuous technical presence.
Yes. One-day assignments can support a specific hold point, fit-up inspection, welding activity, NDT witness point, repair verification or final weld inspection.
Yes. Relevant CVs, qualifications and project experience can be submitted for client technical review before deployment.
The applicable standard and acceptance criteria should be defined by the controlled project documentation. Requirements may include AWS, ASME, API, ISO, EN, Chinese standards or client-specific specifications depending on the equipment and project.
Send us the fabrication requirement.
Have only the supplier location and ITP? Send those first. We can review the technical requirement from there.
Independent welding inspection for pressure equipment, piping, structural steel, shipbuilding, machinery and industrial fabrication throughout China.