- TIG Filler Rod for Mild Steel: Complete Buyer Guide
- High deoxidizer content
- Better performance on mill-scale or dirty surfaces
- Provides smooth arc and bead
- Commonly stocked by distributors for industrial clients
ER70S-3
- Mild steel with low sulfur and phosphorus
- Produces very clean, smooth weld beads
- Ideal for precision fabrication
ER70S-G / ER70S-2G
- Specialized rods for heavy plate welding
- Enhanced penetration and bead appearance
- Often used in structural and heavy fabrication projects
Key Technical Specifications to Consider
Diameter
Common TIG filler rod diameters for mild steel range from 1.0 mm to 3.2 mm. Smaller diameters suit thin materials; thicker rods deposit more metal and are ideal for plates over 6 mm.
Mechanical Properties
Ensure tensile strength and elongation of the rod match or exceed mild steel base metal. Most ER70S series rods have 60–70 ksi tensile strength.
Chemical Composition
Check for deoxidizers like manganese, silicon, or rare earth metals. Proper composition reduces porosity and ensures strong metallurgical bonding.
Current Type Compatibility
TIG filler rods are compatible with AC, DCEN, or DCEP. Confirm compatibility with client power sources to reduce defects and arc instability.
Welding Techniques for Optimal Results
- Proper amperage setting: Always start in the mid-range and adjust based on bead shape.
- Correct angle and feed speed: Feed the rod steadily at 10–15° to the workpiece to maintain smooth weld pool flow.
- Surface preparation: Remove oil, grease, rust, and scale for optimal penetration.
- Shielding gas: Use pure argon or argon blends; ensure sufficient gas flow to prevent oxidation.
- Control heat input: Especially for thin mild steel to avoid burn-through.
Why Buyers Prefer Reliable TIG Filler Rod Suppliers
U gain multiple advantages by sourcing from trustworthy suppliers:
- Consistent quality and mechanical properties
- Traceable lot numbers to ensure reproducibility
- Adequate stock for urgent deliveries
- Technical support on rod handling, storage, and welding procedures
These benefits increase trust, repeat orders, and reduce rework costs, which is critical in B2B industrial operations.
Common Problems and Solutions
Porosity
Cause: insufficient shielding gas or dirty base metal
Solution: increase gas flow, clean surface, adjust travel speed
Lack of Fusion
Cause: wrong rod diameter, low amperage, or improper angle
Solution: select appropriate rod, set correct amperage, and maintain proper technique
Burn-through
Cause: excessive heat input
Solution: reduce amperage, use smaller diameter rod, weld in short passes
Spatter
Cause: incorrect feed or arc length
Solution: steady feed, maintain 2–3 mm arc length
Storage and Handling Best Practices
- Store TIG filler rods in dry cabinets at 18–25°C
- Avoid moisture and contaminants
- Rotate stock (first-in-first-out)
- Advise clients on rod handling and protective packaging
Proper storage reduces oxidation, porosity, and weld defects, giving U a competitive edge.
Procurement and Commercial Tips
- Verify material certificates for ER70S series
- Bundle rods with argon cylinders and consumables for larger orders
- Offer multiple diameters and grades for different fabrication needs
- Consider private labeling or OEM to strengthen local brand presence
- Negotiate lot traceability and quality assurances with manufacturers
Applications of TIG Filler Rod for Mild Steel
- Automotive body panels and chassis
- Pipe and tube fabrication
- Machinery and equipment manufacturing
- General structural steel construction
- Workshop repair and maintenance
By supplying high-quality rods, U ensure customers can achieve strong, precise, and reliable welds across multiple industries.
Conclusion
Choosing the correct TIG filler rod for mild steel is essential for welding quality, operational efficiency, and commercial success. Premium rods like ER70S-2, ER70S-6, and ER70S-3 provide dependable performance for diverse applications. U can cater to workshops, industrial plants, and distributors by offering rods that meet mechanical, chemical, and operational standards. Correct rod selection ensures stronger joints, reduces rework, and boosts customer satisfaction—key factors for B2B success in welding consumables.