Copper Alloy ERCuSi-A SPOOL
Supply condition
UNS C65600 · GB HSCuSi
SPOOL = spooled solid MIG wire, hard-drawn
Product-form condition of the wire itself on a spool — cold-drawn, stiff enough for good feedability.
Values for the SPOOL condition
Other ERCuSi-A tempers and conditions
ERCuSi-A is listed in 2 conditions; see the grade overview at ERCuSi-A.
- AW
- SPOOL
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AWDefault As-welded deposit | Default: properties of the undiluted deposit as laid down by MIG/TIG, no post-weld heat treatment. | 195 | 350 | 38 | 85 HB | 7 % IACS |
SPOOLThis page Spooled solid MIG wire, hard-drawn | Product-form condition of the wire itself on a spool — cold-drawn, stiff enough for good feedability. | 380 | 520 | 14 | 150 HB | 6.5 % IACS |
What is ERCuSi-A SPOOL?
ERCuSi-A SPOOL is ERCuSi-A supplied in the SPOOL condition — product-form condition of the wire itself on a spool — cold-drawn, stiff enough for good feedability. ERCuSi-A SPOOL has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 77% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 103 GPa (14.9 Msi). ERCuSi-A SPOOL has a density of 8.53 g/cm³ (0.308 lb/in³), lighter than 62% of copper alloy grades. It melts at 970°C (1,778 °F). AW is the default condition FabDigit quotes; SPOOL is available on request or by drawing note.
Advantages
- Readily welded — 90/100, better than 98% of copper alloy grades
- Good corrosion resistance — 72/100, better than 84% of copper alloy grades
- High strength — 380 MPa (55.1 ksi), better than 77% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Low electrical conductivity — 6.5 % IACS, worse than 91% of copper alloy grades
- Poor heat conductor — 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 86% of copper alloy grades
ERCuSi-A SPOOL properties
Typical room-temperature values for ERCuSi-A SPOOL; 20 are specific to this condition. Other listed values are ERCuSi-A reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
ERCuSi-A SPOOL has a density of 8.53 g/cm³ (0.308 lb/in³), lighter than 62% of copper alloy grades. It melts at 970°C (1,778 °F).
Mechanical14
ERCuSi-A SPOOL has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 77% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
ERCuSi-A SPOOL is rated for continuous service to 150°C (302 °F). It conducts heat at 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 86% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
ERCuSi-A SPOOL conducts electricity at 6.5 % IACS, worse than 91% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 84% of copper alloy grades.
Sustainability4
Producing a kilogram of ERCuSi-A SPOOL takes about 57 MJ of energy and emits 3.8 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
ERCuSi-A SPOOL's machinability is fair (35/100, better than 51% of copper alloy grades); weldability excellent (90/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ERCuSi-A SPOOL
Is ERCuSi-A easy to machine?
Deposits machine gummy like silicon bronze (~30 % of free-cutting brass) — sharp positive-rake tools, high speed, low feed, flood coolant.
Can ERCuSi-A be welded?
Excellent for short-arc/pulsed GMAW brazing of galvanized sheet with Ar or Ar+1–3 % O₂/CO₂; keep heat input and interpass temperature low (<150 °C) to avoid hot cracking and zinc burn-off.
Can ERCuSi-A be formed, bent or molded?
Wire is cold-drawn; deposits are ductile (30–50 % elongation) and tolerate joint flexing and light peening.
What surface finishes work on ERCuSi-A?
Cannot be anodized; take a bronze polish, chemical patina, or clear lacquer — colour-matches bronze/brass parts better than steel fillers.
ERCuSi-A chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Siprincipal alloying element, gives fluidity and strength | 2.8 – 4 | 3.1 |
| Mndeoxidizer / arc stabilizer | ≤ 1.5 | 1 |
| Sn | ≤ 1 | 0.2 |
| Fe | ≤ 0.5 | 0.1 |
| Zn | ≤ 1 | 0.2 |
| Alkept low to avoid oxide films in the weld pool | ≤ 0.01 | 0.01 |
| Pb | ≤ 0.02 | 0.01 |
| Other (total)AWS A5.7 total of other elements | ≤ 0.5 | — |
| Curemainder, ≈94–96 % | balance | — |
ERCuSi-A SPOOL — frequently asked
What is ERCuSi-A SPOOL used for?
ERCuSi-A SPOOL is typically used for MIG brazing of galvanized sheet, silicon bronze pipe welding, dissimilar metal joining (steel-to-copper) and sculpture/art fabrication. In short: standard MIG-braze filler; low-heat joining of coated steel; bronze colour match.
What is the yield strength of ERCuSi-A SPOOL?
ERCuSi-A SPOOL has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 77% of copper alloy grades. Strength varies by condition: see the 2 listed tempers.
Is ERCuSi-A SPOOL easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of copper alloy grades). Deposits machine gummy like silicon bronze (~30 % of free-cutting brass) — sharp positive-rake tools, high speed, low feed, flood coolant.
Can ERCuSi-A SPOOL be welded?
Yes — weldability is rated excellent (90/100). Excellent for short-arc/pulsed GMAW brazing of galvanized sheet with Ar or Ar+1–3 % O₂/CO₂; keep heat input and interpass temperature low (<150 °C) to avoid hot cracking and zinc burn-off.
What surface finishes work on ERCuSi-A SPOOL?
Cannot be anodized; take a bronze polish, chemical patina, or clear lacquer — colour-matches bronze/brass parts better than steel fillers.
Can ERCuSi-A SPOOL be formed, bent or molded?
Wire is cold-drawn; deposits are ductile (30–50 % elongation) and tolerate joint flexing and light peening.
What is the maximum service temperature of ERCuSi-A SPOOL?
ERCuSi-A SPOOL is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ERCuSi-A-AW and ERCuSi-A SPOOL?
AW is the default condition — default: properties of the undiluted deposit as laid down by MIG/TIG, no post-weld heat treatment. SPOOL: product-form condition of the wire itself on a spool — cold-drawn, stiff enough for good feedability. Yield strength is 195 MPa in AW versus 380 MPa in SPOOL.
Sources
- AWS A5.7/A5.7M — Specification for Copper and Copper-Alloy Bare Welding Rods and Electrodes — American Welding Society (2021)
- C65600 / silicon bronze alloy data — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol.2 — Properties of Copper and Copper Alloys — ASM International (1990)
- Silicon bronze MIG/TIG filler wire datasheets — ESAB / Lincoln Electric / Böhler Welding (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.