Copper Alloy ERCuSi-A
UNS C65600 · GB HSCuSi
ERCuSi-A is a copper-silicon-manganese (silicon bronze) filler wire, C65600 in the AWS A5.7 family, used for MIG brazing of galvanized and coated steel and for joining copper alloys.
Reference datasheet — ERCuSi-A is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the AW condition
ERCuSi-A tempers and conditions
ERCuSi-A is supplied in 2 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
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 |
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 |
Supply forms, finishes and certifications
Ways ERCuSi-A is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
TIG-ROD | TIG cut-length rod, straightened / stress-relieved | Supply form |
MIG-BRAZE | MIG-brazed joint on zinc-coated steel | Surface finish |
What is ERCuSi-A?
ERCuSi-A is a copper-silicon-manganese (silicon bronze) filler wire, C65600 in the AWS A5.7 family, used for MIG brazing of galvanized and coated steel and for joining copper alloys. It wets well at low heat input and fumes little, with an as-welded deposit around 350 MPa tensile, 195 MPa yield, 38% elongation and 85 HB (45 HRB); supplied as spool wire and TIG cut rod. Conductivity is low for a copper filler — 36 W/m·K and 7% IACS — and service is limited to about 200 °C, so use ERCu where the joint must conduct. Keep interpass temperature low to avoid hot cracking. ERCuSi-A 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). ERCuSi-A has a yield strength of 195 MPa (28.3 ksi) and a tensile strength of 350 MPa (50.8 ksi) — weaker than 56% of copper alloy grades. Elongation at break is 38% and the elastic modulus is 103 GPa (14.9 Msi).
What is ERCuSi-A used for?
- MIG brazing of galvanized sheet
- silicon bronze pipe welding
- dissimilar metal joining (steel-to-copper)
- sculpture/art fabrication
Advantages
- Readily welded — 90/100, better than 98% of copper alloy grades
- Good corrosion resistance — 72/100, better than 84% of copper alloy grades
- Ductile — tolerates forming and impact — 38%, better than 82% of copper alloy grades
- Forms and bends easily — 70/100, better than 80% of copper alloy grades
Limitations
- Poor heat conductor — 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 86% of copper alloy grades
- Low electrical conductivity — 7 % IACS, worse than 86% of copper alloy grades
ERCuSi-A properties
Typical room-temperature values for ERCuSi-A-AW; bars are the position among copper alloy grades.
Physical3
ERCuSi-A 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 has a yield strength of 195 MPa (28.3 ksi) and a tensile strength of 350 MPa (50.8 ksi) — weaker than 56% of copper alloy grades. Elongation at break is 38% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
ERCuSi-A is rated for continuous service to 200°C (392 °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 conducts electricity at 7 % IACS, worse than 86% 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 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's machinability is poor (33/100, worse than 53% of copper alloy grades); weldability excellent (90/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. ERCuSi-A is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ERCuSi-A
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.
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 |
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.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Copper Alloy ERCuSi-A in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- C65600
- GB (China)
- HSCuSi
How much does ERCuSi-A cost?
ERCuSi-A is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
ERCuSi-A — frequently asked
What is ERCuSi-A used for?
ERCuSi-A 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?
ERCuSi-A has a typical yield strength of 195 MPa (28.3 ksi) and a tensile strength of 350 MPa (50.8 ksi) — weaker than 56% of copper alloy grades. Strength varies by condition: see the 2 listed tempers.
Is ERCuSi-A easy to machine?
Not especially — machinability is rated poor (33/100, worse than 53% 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 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?
Cannot be anodized; take a bronze polish, chemical patina, or clear lacquer — colour-matches bronze/brass parts better than steel fillers.
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 is the maximum service temperature of ERCuSi-A?
ERCuSi-A is rated for continuous use to about 200°C (392 °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.
How much does ERCuSi-A cost?
ERCuSi-A is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.