Explore our industrial-grade welding wire portfolio manufactured at our State-of-the-Art Facility.
ER321LSi TIG Rod is an advanced titanium-stabilized, high-silicon austenitic stainless steel welding consumable. In challenging high-temperature industrial environments, standard stainless steel grades are prone to chromium carbide precipitation along grain boundaries—a phenomenon known as sensitization. This reduces the steel's corrosion resistance in the heat-affected zone (HAZ).
To prevent this structural compromise, ER321LSi features a critical addition of titanium, which preferentially binds with carbon to form titanium carbides. Titanium carbides are highly stable at high temperatures, shielding the grain-boundary chromium from depletion. Furthermore, the "LSi" suffix designates a low-carbon designation coupled with enhanced silicon content. The elevated silicon (0.65% to 1.00%) improves the molten metal's surface tension, resulting in superior weld puddle fluidity, smoother bead appearance, and cleaner tie-ins during critical TIG welding procedures.
Key Innovation: Titanium stabilization prevents intergranular corrosion (IGC) under continuous thermal exposure up to 800°C.
| Alloy Grade | C (%) | Mn (%) | Si (%) | Cr (%) | Ni (%) | Ti (%) | P & S (%) |
|---|---|---|---|---|---|---|---|
| ER321LSi | ≤ 0.03 | 1.0 - 2.5 | 0.65 - 1.00 | 18.5 - 20.5 | 9.0 - 10.5 | 5 x C to 0.70 | ≤ 0.030 |
| Standard ER321 | ≤ 0.08 | 1.0 - 2.5 | 0.30 - 0.65 | 18.5 - 20.5 | 9.0 - 10.5 | 9 x C to 1.00 | ≤ 0.030 |
How Wulian Yuxin Hardware Equipment Co., Ltd. merges high-throughput capabilities with strict compliance.
Established in Wulian, Rizhao City, Shandong Province, Wulian Yuxin Hardware Equipment Co., Ltd. has grown from a locally excellent manufacturer to a globally recognized producer of premium welding consumables. Our own 15,000-square-meter production facility integrates smart manufacturing methodologies, allowing us to maintain complete control over the chemical synthesis, physical wire drawing, continuous annealing, and surface treatment of our welding alloys.
For international procurers, sourcing from a dedicated China OEM factory delivers unmatched cost efficiencies, scalable production, and custom chemical tolerances. Our automated draw benches utilize real-time laser micrometer inspection to keep rod diameter tolerances within ±0.01mm—which is 30% stricter than standard AWS and EN specifications. This high precision prevents wire-feed blockages in automated systems and guarantees stable current distribution during manual TIG operations.
Our drawings processes are controlled by multi-stage PLC systems, ensuring structural wire alignment and zero surface contamination.
Compliance with ISO9001, CE, AWS A5.9, and EN ISO 14343-A. All raw materials are tracked from melt to shipment.
We offer customized tube markings, protective nitrogen-flushed packaging, and OEM brand labels to suit specific markets.
Achieving defect-free welds with ER321LSi TIG rods requires meticulous control of thermal inputs and shielding gas parameters. Because titanium is highly reactive, it easily oxidizes when exposed to air at high temperatures. Welders must use high-purity argon shielding gas (minimum 99.999% purity) and, for critical tube welds, back-purging is essential to protect the root run from oxidation (sugaring).
Wulian Yuxin's metallurgy R&D department recommends maintaining a low interpass temperature (below 150°C) to mitigate hot-cracking risks. The presence of controlled trace delta-ferrite (typically 3-8 FN on the WRC-1992 diagram) in our ER321LSi rods provides solid-state defense against micro-fissuring, keeping the weld zone robust and resilient.
Our product lineup addresses diverse structural applications, from high-pressure piping to heavy machinery components. Our manufacturing range includes:
A transparent look into our 15,000 m² factory floor, drawing machinery, and storage yards.
Reliable logistics and regional support structures across five continents.
Today, our products are trusted by industrial clients in over 20 countries worldwide. From major infrastructure developments in Germany and high-spec chemical plants in Poland, to automotive production lines in Brazil and manufacturing hubs in Vietnam, Wulian Yuxin's welding consumables form the invisible, high-strength bonds holding modern projects together.
Our primary export footprint includes:
We provide full compliance with international port-of-entry requirements, custom commercial invoicing, SGS or TÜV third-party material certifications, and carbon footprints declarations for EU markets (CBAM ready).
Technical guidance for global procurement managers and structural engineering firms.
In modern high-performance exhaust designs, manifold assemblies operate at cyclic temperature extremes. ER321LSi TIG rods prevent heat-induced cracks in stainless steel tubes (particularly AISI 321 or 304L). The high-silicon content stabilizes the molten pool against gravitational runout, enabling faster travel speeds on automated robotic welding systems.
Corrosive chemical mediums like nitric acid and warm organic solvents put industrial welds at risk of stress corrosion cracking (SCC). Applying ER321LSi ensures that the weld metal chemistry mirrors the host base metal, ensuring uniform thermal expansion coefficients and robust electrochemical passivity.
When choosing a Chinese supplier, global procurement agents must verify the manufacturer's control over chemical purity. Poorly controlled carbon levels or low titanium-to-carbon stabilization ratios will lead to premature weld failure. At Wulian Yuxin, our raw wire stock undergoes extensive spectral validation before entering the drawing blocks, ensuring compliance with AWS A5.9 standards.
High-efficiency structural steel welding in industrial fabrication and automotive chassis assemblies.
Exceptional slag release and deep penetration profiles for heavy-duty shipbuilding and offshore pipelines.
Critical storage tank weldments requiring maximum pitting resistance in dairy and pharmaceutical setups.
Root passes on boiler tubes demanding x-ray clear weld structures and uniform reverse bead profiles.
Maintenance repair welding on structural framework, offering robust arc stability, minimal spatter levels, and easy slag detachability.
The next phase of welding consumable engineering and green production initiatives.
As advanced mechanical designs demand increasingly specialized alloys, the parameters for TIG rods are shifting toward high chemical purity and reduced carbon contents. Wulian Yuxin's forward-looking technology plan focuses on three key pillars:
Through close collaborations with industrial partners across Europe and Asia, we ensure our production matches real-world operational changes, providing structural strength that keeps pace with engineering advancements.
Essential metallurgical and operational knowledge for professional welders and inspectors.
High-integrity options tailored for distribution networks and industrial clients.
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