Case Study: Reliable Orbital Welding for Nuclear Power Plant Piping

Nuclear power plants demand the highest standards of weld quality and traceability for their process piping systems. A leading nuclear equipment fabricator approached Hyzont (Shanghai) Industrial Technologies Co., Ltd. seeking an automated orbital welding solution capable of producing consistent, code-compliant butt welds on stainless steel tubing ranging from 6 mm to 38 mm in outer diameter.

Challenge

• Welding 1/4" to 1-1/2" stainless steel tubes with zero defects
• Meeting stringent nuclear code requirements (ASME Section III / RCC-M)
• Ensuring repeatable weld quality across hundreds of identical joints
• Minimizing human error in high-radiation-risk environments

Solution

Hyzont supplied a dedicated nuclear-grade pipe butt welding machine featuring a TIG autogenous welding head with closed-chamber design. The system provides:

Results

• Weld acceptance rate improved to over 99.5% on first pass
• Production throughput increased by 3x compared to manual TIG welding
• Complete weld parameter documentation for every joint
• Reduced operator skill dependency and training time

The customer has since standardized on Hyzont orbital welding equipment for all new nuclear piping projects, citing consistent quality, reliable after-sales support, and excellent documentation capabilities.

Why Orbital Welding for Nuclear Piping?

Nuclear power plant piping systems carry high-pressure, high-temperature fluids that demand flawless weld integrity. Manual TIG welding introduces variability from operator fatigue, hand steadiness and environmental conditions. Orbital welding mechanizes the torch rotation, removing human factors and delivering identical weld profiles across every joint. The closed-chamber welding head provides controlled gas shielding and prevents oxidation on both the outer and inner surfaces of the tube, which is critical for corrosion resistance in nuclear service.

Key Technical Advantages

• Multi-pass welding capability for wall thicknesses up to 6 mm in a single setup
• Programmable weld schedules stored digitally for instant recall and replication
• Integrated gas purge control with pre-flow and post-flow timers
• High-frequency arc starting for non-contact tungsten electrode ignition
• Torch rotation speed and current ramping precisely controlled by closed-loop feedback
• Compact head design allows welding in confined spaces and tight pipe racks

About Hyzont

Hyzont (Shanghai) Industrial Technologies Co., Ltd. specializes in automated welding and cutting equipment for demanding industrial applications. With over a decade of engineering experience, Hyzont serves clients in nuclear energy, petrochemical, semiconductor, food and beverage, and power generation industries worldwide. Every machine is manufactured under ISO 9001 quality management and is available with CE certification for European markets. Our engineers provide complete installation guidance, operator training and responsive after-sales support.

Get in Touch

If your project requires reliable, code-compliant orbital welding for nuclear or industrial piping, contact Hyzont today. Our team will recommend the optimal machine configuration based on your tube materials, diameters, wall thickness and production volume, and provide a detailed quotation with delivery schedule.