TIG Welding Filler Rods — Mild Steel, Stainless, Aluminium, Chrome-Moly

ER70S-2 contains additional deoxidiser elements (titanium, zirconium, aluminium beyond the standard silicon + manganese) — these absorb and neutralise residual oxygen in the puddle, producing a cleaner, more porosity-free weld bead. Root-pass welding is especially sensitive to oxygen contamination because the back-side of the weld isn't shielded by gas — purging gas helps but isn't perfect. ER70S-2's extra deoxidisers provide insurance against root porosity. ER70S-6 (silicon-rich) is fine for fill-pass and general TIG but not preferred for root-pass on critical pipework.

ER308L is for welding 304 / 304L parent metal — general stainless service. ER316L contains 2-3% molybdenum (added to the deposit chemistry) — for welding 316 / 316L parent metal where chloride or pitting corrosion is a concern. Pharma pure-steam piping, marine seawater systems, chemical plants with chlorides — all use 316L parent + ER316L filler. Both are low-carbon (≤0.04%) — the 'L' prevents intergranular corrosion. Match filler to parent: never use ER308L on 316 (loses molybdenum benefit) or ER316L on 304 (unnecessary cost).

Standard length: 1 metre / 3 feet (industry standard, fits typical TIG welding workbenches). Pack: 5 kg tube (typically 60-180 rods depending on diameter). Bulk packs: 25 kg cartons (5 × 5kg tubes), 50 kg cartons (10 tubes). Lengths can be cut on order — some pharma fab shops use 0.5 m / 18-inch rods for sanitary work where rod handling is more sensitive.

Yes. Ador ER80S-B2 (1.25Cr-0.5Mo) and ER90S-B3 (2.25Cr-1Mo) chrome-moly TIG rods are widely qualified for refinery boiler tube root-pass welding per ASME Section IX procedures. Used by HPCL, BPCL, IOCL boiler turnaround contractors and pressure-vessel fabricators. We provide PQR-support documentation per ASME Section II Part C. Always check your project's specific WPS for filler classification before order.

Yes for all chloride-exposed service (pharma, chemical, marine). Back-purging with argon (or 95/5 Ar/H2 for stainless) prevents oxidation of the root-pass underside — oxidation creates 'sugar' (heat-tinted oxide scale) that promotes corrosion in service. Pharma equipment fabrication treats back-purging as mandatory. Pure-argon back-purge for general fabrication; argon-hydrogen mix for premium stainless work. Failure to back-purge causes early corrosion failure of high-purity stainless systems.

Keep rods in original packaging until needed. Once a tube is opened, transfer rods to a dry, covered tube container. Never lay TIG rods on dirty workbenches — surface contamination (oil, grease, dust) burns into the weld and creates inclusions. Don't touch rod ends with bare hands — finger oils contaminate. Use clean cotton gloves for rod handling. Reject rods with surface oxidation, rust, or visible contamination.