Welding Wire
ER80S-Ni1
ER80S-Ni1 is copper-coated low-alloy solid welding wire with ~1% nickel content, designed for cryogenic pressure vessels & weathering steel with excellent low-temperature toughness down to -45°C.
WELDING WIRE AND ROD (MIG & TIG)
ER80S-Ni1 is copper-coated low-alloy solid welding wire with ~1% nickel content, designed for cryogenic pressure vessels & weathering steel with excellent low-temperature toughness down to -45°C.
Applicable Welding Processes & Shielding Gases
1, MIG GMAW
· Preferred shielding gas: 80% Ar + 20% CO₂ (M21 mixed gas)
· Alternative: 95% Ar + 5% CO₂ (for low-spatter pulse welding)
· Gas flow rate: 18~25 L/min
· Polarity: DCEP (Direct Current Electrode Positive)
2, TIG GTAW
· Shielding gas: 100% high-purity argon (≥99.99%)
· Gas flow rate: 10~15 L/min; back purging is recommended for pipe root welds
· Polarity: DCEN (Direct Current Electrode Negative)
Welding Positions for MIG & TIG
Suitable for all-position welding (flat, horizontal, vertical, overhead) for both MIG and TIG processes,
· TIG: Easy molten pool control, stable bead appearance for all positions, ideal for pipe root passes in overhead & field installation,
· MIG: Best performance on flat & horizontal positions. Pulse MIG is recommended for vertical and overhead welding to avoid sagging weld metal.
Mechanical Properties
· Tensile Strength: ≥550 MPa (80 ksi),
· Yield Strength: ≥470 MPa (68 ksi),
· Elongation: ≥24%,
· Low-temperature Impact Property: Charpy V-notch impact energy ≥27 J at -45°C (-50℉),
· Outstanding low-temperature toughness is its core advantage.
Features
· Uniform copper coating ensures excellent conductivity, smooth wire feeding and rust resistance,
· Stable arc with minimal spatter, smooth defect-free weld beads, meets Class 1 RT standard,
· 1% nickel alloy delivers outstanding Charpy toughness at -45°C,
· Suitable for all-position welding,
· Lower hardenability than Cr-Mo B2 wire, less strict preheat & PWHT requirements,
· Ideal for weathering steel & low-temperature Mn-Ni steel, compatible with NACE service.
Base Metals for Welding
· Cryogenic pressure vessel steels: 16MnDR, 15MnNiDR, 07MnNiCrMoVDR
· Weathering steels: ASTM A588, Q355NH
· High-strength low-alloy structural steels: P460NL, 15MnNi63
· General 550MPa-grade high-strength low-alloy steels, tank and cryogenic pipeline base materials
Welding Precautions
·Mild preheat requirement: 50~80℃ for thin plates, 80~120℃ for thick plates over 20mm,
·Control interpass temperature below 150℃ to retain low-temperature toughness,
·PWHT is not mandatory; only optional stress relief for heavy load vessels,
·Clean oil, rust & moisture within 20mm of groove to avoid hydrogen porosity,
·Wind shielding is required to prevent nickel oxidation & toughness loss,
·Store wire in dry environment; damp wire is prohibited.
Common Technical Issues & Solutions
· Insufficient low-temperature impact toughness Control interpass temperature ≤150℃, provide wind shielding, fully clean groove to avoid oxidation and hydrogen brittleness.
· Weld porosity Check gas pipeline tightness, remove moisture/rust on base metal, use dry wire and wind shield,
· Weld sagging at vertical & overhead positions Adopt pulse MIG, low current & short arc operation,
· Cold cracking on thick plates Apply preheat of 80~120℃ for thickness over 20mm, reduce welding restraint stress,
· Loss of toughness due to improper PWHT PWHT is not mandatory; avoid high-temperature long-time heat preservation,
· Alloy burn-off & poor toughness Pure CO₂ is forbidden; use Ar+CO₂ mixed shielding gas only,
· Root oxidation of pipe welds Implement back purging during TIG root pass welding,
· Unsuitable matching base metal Not applicable for high-temperature Cr-Mo steel such as 15CrMo/P11; use ER80S-B2 instead,
· Inclusion & incomplete fusion Grind oxide scale between layers, adopt proper welding current,
· Wire storage failure Store wire in dry sealed environment; damp wire shall not be used.
