Welding & Fabrication
Certified MIG, TIG and arc welding across all major steel grades, delivered by qualified welders under EN ISO 3834-2 quality systems.
Request a QuoteCapabilities
- EN ISO 3834-2 certified welding
- MIG, TIG and Arc welding processes
- Material thickness: 1mm to 100mm
- All steel grades including stainless and duplex
- Aluminum welding capability
- Robotic and manual welding cells
- NDT testing (UT, PT, MT, VT) available
- WPS/WPQR documentation per EN ISO 15614
Standards & Certifications
All welders qualified per EN ISO 9606 with valid WPS/WPQR documentation. Full traceability from raw material through final inspection.
How a weld is actually qualified
A welded joint is only as good as the paperwork behind it. Before a production weld is struck we hold a welding procedure specification for that joint — parent material, filler, joint geometry, position, preheat, interpass temperature, travel speed — and a welding procedure qualification record proving it produces a sound joint, tested to EN ISO 15614. The welder who runs it holds a valid EN ISO 9606 qualification for that process, material group, thickness range and position. Nothing about that is optional under EN ISO 3834-2: it is the difference between a weld and a weld you can certify.
Process choice follows the joint, not the shop's preference. MAG with solid wire carries most of our structural volume because it deposits fast on 4 mm and up. TIG goes where the joint has to be clean and the heat input controlled — thin stainless, aluminium, anything that will be visible or pressure-tested. Robotic cells take the long, repeatable seams on series parts, where a consistent torch angle and travel speed matter more than an operator's judgement. Manual arc still earns its place on site work and heavy sections in awkward positions.
Distortion is designed out before it is welded in. Heavy fabrications are tacked in sequence, welded in a balanced order and, where the drawing demands flatness, stress-relieved or straightened after. For EN 1090-2 EXC2 work the execution class dictates the extent of inspection, so visual testing is 100% and volumetric testing is applied to the percentage of joints the class requires — ultrasonic on full-penetration butt welds, magnetic particle or dye penetrant on fillets and accessible surfaces. Reports travel with the part.
Welding processes and where each is used
| Process | Typical use | Range and notes |
|---|---|---|
| MAG, solid wire (135) | Structural steel fabrications, tanks, chassis and frame assemblies | 4–100 mm; highest deposition rate, our main structural process |
| MAG, flux-cored (136) | Heavy sections and positional welding where penetration matters | 6–100 mm; better sidewall fusion out of position |
| TIG (141) | Stainless and aluminium, thin wall, pressure-retaining and visible seams | 1–8 mm; lowest heat input, cleanest bead |
| Robotic MAG cells | Series parts with long repeatable seams — agricultural and construction components | 3–20 mm; consistent torch angle and travel speed across a run |
Thickness ranges are what we weld routinely under qualified procedures, not absolute machine limits. A joint outside these figures is not a refusal — it means the procedure is qualified for it first.
Welding Questions
What welding certifications does KREA hold?
EN ISO 3834-2, the comprehensive quality level for fusion welding, which is the tier that lets us weld for EN 1090-2 EXC2 structural work. We also hold EN ISO 15085 CL1 for railway vehicles and components, and weld to AWS D1.1 where a customer specifies the American code. Welders are individually qualified to EN ISO 9606 and procedures to EN ISO 15614.
Can you weld stainless and aluminium as well as carbon steel?
Yes, and they are kept apart. Stainless and aluminium are processed in separate areas with dedicated consumables, brushes and grinding media, because carbon steel contamination causes rust staining on stainless and porosity in aluminium. Duplex stainless is welded under its own procedures with controlled heat input, since both excessive and insufficient heat damage the ferrite-austenite balance.
What NDT can you supply, and who does it?
Visual testing (VT) is in-house on every weld. Ultrasonic (UT), magnetic particle (MT) and dye penetrant (PT) are supplied to the extent the execution class or your specification requires, performed by qualified personnel with reports referenced to the weld map. Radiographic testing is arranged through an accredited third party when a specification calls for it.
How do you control distortion on large fabrications?
By sequence and by fixture, before heat goes in. Parts are tacked in a defined order, welded in a balanced pattern so shrinkage cancels rather than accumulates, and clamped in jigs for repeat work. Where the drawing calls for flatness or a machined face after welding, we allow stock and machine post-weld rather than trying to straighten a finished part.
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