Structural Steel Welding

Structural Steel Welding – Precision Fabrication for High-Strength Connections

At LiYou Steel Structure Engineering, we specialize in industrial-grade structural steel welding, delivering code-compliant, high-integrity welded connections for buildings, bridges, and heavy infrastructure. Our EN 1090 and ISO 3834 certified welding processes ensure exceptional strength, durability, and fatigue resistance in every joint.

Why Choose Our Structural Steel Welding Services?

1. Advanced Welding Techniques

✔ Robotic SAW/GMAW for consistent, high-penetration welds
✔ Manual SMAW/FCAW for complex field connections
✔ Submerged Arc Welding (SAW) for thick-plate girders (up to 120mm)

2. Certified Welder Expertise

• AWS D1.1/D1.5 & EN ISO 9606-1 certified welders

• NDT-trained inspectors (UT, MT, RT testing)

• WPS/PQR documentation for traceability

3. Quality Assurance

• 100% visual inspection + random UT testing

• Preheat/interpass temp control to prevent cracking

• Post-weld stress relieving for critical applications

4. Project-Specific Capabilities

• Seismic moment connections (SCBF, SMF per AISC 341)

• Tubular truss nodes (CHS/RHS connections)

• Orthotropic deck welding for long-span bridges

Recent Welding Projects

 2,360-ton metro depot – 1,200m of full-penetration groove welds (SAW)
 650-ton arch bridge – Tube-to-gusset welds with 100% UT pass rate
 1,126-ton industrial gantry – Thick-flange butt welds with PWHT