Welded Assemblies: a buyer's sourcing guide
Everything a procurement team should know before opening an RFQ for welded assemblies: materials, tolerances, certifications and red flags.
Recent RFQs in welded assemblies
Overview
Welded assemblies combine cut, formed and machined components into structural sub-systems: frames, skids, tanks, pressure vessels. Quality lives in the welding procedure (WPS), qualified welders and post-weld treatments.
When to choose this process
Use for low-to-medium volume sub-assemblies where casting or forging would be uneconomic.
Typical materials
- S235/S355 structural steel
- AISI 304/316L stainless
- Duplex
- Aluminium 5083/6082
- Hardox
Typical tolerances
Assembly ±1–3 mm/m depending on jigging; distortion compensation often required.
Certifications to ask for
- EN 1090 EXC2/EXC3
- EN ISO 3834-2
- ASME IX for pressure
- PED 2014/68/EU
Frequently asked questions
Do I need to provide the WPS?
No. Send drawing + material + service conditions; the supplier issues WPS/PQR and welder qualification records for your approval.
Robotic vs manual welding?
Robotic is consistent above ~200 identical assemblies/year and on repetitive seams; manual stays competitive on one-offs and complex access.
Sourcing countries covered
Editorial market guide. Supplyria is a marketplace; we don't list private suppliers on this page. Cost ranges and lead times are indicative and based on public industry benchmarks.