Complex Welded Assemblies That Must Be Machined to Precision
Custom welded steel structures certified to EN 1090-2 EXC4, designed and executed for subsequent precision machining. From 10 kg prototypes to 25-tonne assemblies, we control the entire process: welding → stress relief → machining → verification.
Complex Welded Assemblies Engineered for Precision
At Steiger, we specialize in complex welded steel structures that demand both structural integrity and dimensional precision. Our integrated approach combines certified welding capabilities with in-house precision machining, enabling us to deliver assemblies from 10 kg prototypes to 25-tonne structures with tolerances down to 0.05 mm.
Whether you need aerospace-level precision, railway-certified welding, or heavy industrial assemblies, we deliver complete solutions from raw material to final inspection.
Certified to Execution Standards
Our welding operations are certified to European and international standards, ensuring systematic quality management and documented procedures for every project. This means we can handle aerospace, railway, and critical structural projects with full traceability and accountability.
Certifications: EN 1090-2 EXC4 (Execution Class 4), EN 15085-2 (Railway Welding Certification), ISO 3834-2 (Comprehensive Welding Quality)
Personnel & Qualifications: 10 TÜV-certified welders, 2 International/European Welding Engineers (IWE/EWE), 2 International Welding Practitioners (IWP), 1 International Welding Technologist (IWT), 20+ documented welding procedure qualification records (WPQRs), Material certifications with full traceability to mill certificates
Advanced Welding Processes for Every Application
Arc Welding (GMAW / MIG-MAG)
- Best for: High productivity, thick materials, long welds
- Materials: Carbon steel, stainless steel, aluminium
- Typical applications: Heavy structural assemblies, large frameworks, industrial equipment
- Advantages: Fast deposition rates, excellent penetration, minimal cleanup
Gas Tungsten Arc Welding (GTAW / TIG)
- Best for: Precision welds, thin materials, critical joints
- Materials: Stainless steel, aluminium, exotic alloys
- Typical applications: Aerospace components, precision fixtures, root passes
- Advantages: Superior quality, minimal distortion, excellent control
Submerged Arc Welding (SAW)
- Best for: Long, straight welds on thick materials
- Materials: Carbon steel, low-alloy steel
- Typical applications: Heavy beams, large plates, pressure vessels
- Advantages: Deep penetration, high deposition rates, minimal spatter
Shielded Metal Arc Welding (SMAW / MMA)
- Best for: Field welding, difficult positions, repair work
- Materials: Carbon steel, stainless steel, cast iron
- Typical applications: On-site installation, structural repairs, thick sections
- Advantages: Versatile, portable, works in challenging conditions
Material capabilities:
- Carbon steel (S235 to S690)
- Stainless steel (304, 316, duplex)
- Low-alloy steels
- Aluminum (5000, 6000 series)
- Thickness range: 1 mm to 100 mm+
Capacity:
- Component size: Up to 12 metres length
- Component weight: Up to 25 tonnes
- Weld length: Unlimited (multi-pass capability)
- Production area: Over 7,000 m² with 9 bridge cranes (35 t capacity)
Every Weld Verified, Every Dimension Measured
Visual Examination (VT) — Level II In-House
- 100% visual inspection of all welds
- Certified inspectors per ISO 9712
- Documented inspection reports
Liquid Penetrant Testing (PT) — Level II In-House
- Surface crack detection
- Critical weld verification
- Aerospace and railway applications
Ultrasonic Testing (UT) — External Partners
- Volumetric inspection of thick welds
- Internal defect detection
- Certified to EN ISO 17640
Radiographic Testing (X-ray) — External Partners
- Permanent quality records
- Pressure vessel certification
- Customer-required documentation
Dimensional Verification:
- Leica Absolute Tracker AT403 (0.8m to 320m measurement volume)
- Hexagon Romer portable measuring arm (2.5 m working diameter)
- Laser scanner and tactile probing
- 0.05mm precision verification over 10 metres
What this means: “We don’t wait until final assembly to discover problems. Every welded component is inspected and measured before it moves to the next operation. If machining is required, we verify dimensions at the welded stage, after stress relief (if applicable), and after final machining.”
From Prototypes to Production — Complex Assemblies We’ve Built
Aerospace & Defense
Satellite transport unit structures
Aircraft assembly fixtures and tooling
Precision welded frames for testing equipment
Example: Airbus satellite transport structure — welded frame machined to 0.1 mm tolerance
Railway & Transportation
Railway component assemblies (EN 15085-2 certified)
Track system structures
Heavy machine beds (60+ tonnes)
Example: Van Halteren Technologies railway components — certified welding + precision machining
Energy & Power
Transformer housings and frames
Electrical equipment enclosures
Wave generator structures
Example: Bosch Rexroth Wave Generator — 51 tonnes, 8 main welded structures, 0.05 mm final precision
Heavy Industrial Equipment
Custom machinery frames
Processing equipment assemblies
Manufacturing tool structures
Example: Michelin tire manufacturing equipment — welded + machined assembly
How We Execute
Complex Welded Assembly Projects
Step 1: Technical Review & Quote
Upload your drawings (PDF, DWG, STEP)
Our welding engineers review for feasibility
We identify potential challenges (distortion, access, tolerances)
Detailed quote within 3-5 business days
Step 2: Design for Manufacturing (DFM)
Welding sequence planning
Fixture design (if required)
Machining allowance calculation
Material specification and procurement
Step 3: Welding Procedure Qualification
WPQR development (if new material/process combination)
Test welds and NDT verification
Customer approval (if required)
Step 4: Fabrication & Welding
Material traceability (mill certificates)
Certified welders assigned
In-process inspection (VT, PT)
Dimensional verification at key stages
Step 5: Stress Relief (If Required)
Thermal stress relief per specifications
Documented temperature/time cycles
Post-treatment inspection
Step 6: Machining (If Required)
Transfer to CNC machining centres
Post-weld precision machining
Tight tolerance achievement (0.05mm capable)
Step 7: Final Inspection & Testing
Dimensional verification (laser tracker, CMM)
NDT (UT, X-ray if specified)
Surface treatment (blasting, painting)
Documentation package
Step 8: Delivery & Installation
Secure packaging for transport
On-site installation available
Technical support during assembly
What Makes Our Welding Different
Integration Eliminates Risk
When welding and machining happen under one roof, there’s no finger-pointing. We take complete responsibility for dimensional accuracy from raw material to final inspection. If distortion occurs, we fix it—no coordination delays, no change orders between suppliers.
Welding Engineers Who Understand Machining
Our 2 International Welding Engineers don’t just know how to weld—they understand how welding affects subsequent machining. Weld sequences, heat input, and stress relief protocols are designed with the final machined dimensions in mind.
Family-Owned Reliability
Since 1994, every welded component carries our name. We’re not a job shop churning out volume—we’re a manufacturing partner who treats your project as if it were our own. Direct communication with decision-makers, flexible problem-solving, and long-term relationship focus.
“Professional, Experienced, Trustworthy”
– MALCHEM ROMANIA
Frequently Asked Questions
Yes—this is our core strength. We control both processes in-house, eliminating coordination risk. Typical workflow: welding → stress relief (if needed) → precision machining → final inspection.
Up to 12 metres length and 25 tonnes weight. Our 7,000+ m² facility has 9 bridge cranes with 35-tonne capacity and 5.8 m hook height.
Yes, certified since 2019. We can weld railway components and vehicles to EN 15085-2 CL1 requirements.
Yes. We’re certified to EN 1090-2 EXC4 (highest execution class) and ISO 3834-2. Our clients include Airbus and Lockheed Martin. We use the same quality systems and verification methods as Western European aerospace suppliers.
All positions (flat, horizontal, vertical, overhead). Our certified welders are qualified for positional welding per ISO 9606-1.
Yes, full material traceability with mill certificates (EN 10204 3.1 or 3.2 as required).
Yes. We weld carbon steel, stainless steel (304, 316, duplex), and aluminium (5000/6000 series) with appropriate certified procedures.
Project timelines vary based on complexity, material availability, and machining requirements. Please contact us to discuss your specific project schedule and requirements.
Yes, for final assembly and installation. We’ve installed projects in Netherlands, Germany, and throughout Romania.
Multiple strategies: optimized weld sequences, fixture design, heat input control, stress relief (when required), and machining allowances calculated by our welding engineers. We verify dimensions at each stage with laser tracker.
Ready to Discuss Your Welded Assembly Project?
Whether you need a single prototype or a complex multi-part assembly, our welding engineers are ready to review your requirements. Upload your drawings for a detailed technical quote.