ERCuSi-A TIG Rod
COREWELD CuSiA ERCuSi-A TIG Rod contains around 3% silicon in a copper matrix, which lowers the melting point to roughly 900°C and produces a free-running weld pool. Fabricators run it on copper, silicon bronze and brass, and braze-weld galvanised or coated sheet steel with it because the low heat input protects the zinc layer. Repair shops use the same rod to rebuild worn bronze castings. Metracore Alloys Private Limited supplies this filler metal through its COREWELD brand to fabrication, oil and gas, and infrastructure contractors.
What is ERCuSi-A TIG Rod?
AWS A5.7 classifies ERCuSi-A as a copper-silicon (silicon bronze) filler metal, with silicon acting as the deoxidiser and the main strengthening element. Welders feed the cut-length rod by hand into the arc during gas tungsten arc welding, which keeps the deposit rate and heat input under direct operator control. The rod suits joining and surfacing work on copper-silicon and copper-zinc alloys, deoxidised copper, and galvanised, zinc-coated or thin carbon steel sheet. Dissimilar combinations such as copper alloy to steel also fall within its range, though the base material pairing and an approved welding procedure decide whether the joint qualifies for service.
Technical Specifications of COREWELD CuSiA
Specification data drives filler selection before anything else. Check every value below against the COREWELD CuSiA datasheet and confirm the certification scope with the supplier before you release the rod to a production weld.
Brand
COREWELD CuSiA
Product Name
ERCuSi-A TIG Rod
AWS Classification
ERCuSi-A
Filler Metal Type
Silicon Bronze
Welding Process
TIG (GTAW)
Applicable Standard
AWS A5.7 / ASME SFA-5.7, subject to product certification
Reach out to Metracore Alloys Private Limited for reliable ERCuSi-A TIG Rod Solutions
Chemical Composition and Mechanical Properties
ERCuSi-A runs 2.80 to 4.00% silicon in a copper balance per AWS A5.7, with weld metal reaching 345 to 380 MPa tensile and 30 to 40% elongation.
Chemical Composition of ERCuSi-A
| Element | Composition (%) |
| Copper (Cu) | Remainder |
| Silicon (Si) | 2.80 – 4.00 |
| Manganese (Mn) | 1.50 max |
| Iron (Fe) | 0.50 max |
| Zinc (Zn) | 1.00 max |
| Tin (Sn) | 1.00 max |
Mechanical Properties of ERCuSi-A Weld Metal
| Property | Value (typical) |
| Tensile Strength | 345 – 380 MPa |
| Yield Strength | 140 – 185 MPa |
| Elongation | 30 – 40% |
| Hardness | 80 – 95 HB |
AWS A5.7 sets no mandatory mechanical requirement for this classification. Joint results shift with travel speed, interpass temperature, dilution from the base metal and the test method applied.
ERCuSi-A TIG Rod vs. ERCuSi-A MIG Wire
Both products share the same chemistry and differ only in form and feeding. The TIG version ships as straight cut lengths that the welder dips into the pool by hand while the tungsten electrode maintains the arc. ERCuSi-A MIG wire comes spooled, and the gun feeds it continuously as a consumable electrode under GMAW parameters. Hand feeding gives finer control on thin gauge sheet, root passes and cosmetic repair, where a single degree of extra heat burns through. Spool feeding wins on deposition rate, so production lines running long braze-welded seams on galvanised panels choose the wire. Your equipment, joint length and required finish settle the choice.
ERCuSi-A TIG Rod Applications
Low heat input and strong wetting on coated surfaces push this rod into sheet metal and copper alloy work across several sectors:
- Braze welding of galvanised, zinc-coated and Galvalume sheet in HVAC ducting and automotive body panels
- Joining silicon bronze, brass and deoxidised copper sections
- Surfacing and build-up on worn bronze bushes, bearings and pump components
- Marine and architectural fabrication in copper alloy
- Thin gauge carbon steel repair where arc heat would otherwise distort the part
- Dissimilar joints between copper alloy and steel, under a qualified procedure
Manufacturing Process of ERCuSi-A TIG Rod
- Melt electrolytic copper with silicon and manganese additions under controlled furnace conditions
- Cast the melt into billets or bars and sample for spectrographic composition analysis
- Hot extrude the billet, then cold draw it through successive dies to the target diameter
- Anneal between draws to restore ductility and keep the rod straight
- Clean the surface to strip oxide and drawing lubricant
- Straighten and cut to fixed lengths, then inspect diameter and surface finish
- Mark, bundle and pack the rods with the applicable test certificate
Key Benefits of COREWELD CuSiA Filler Metal
- Melts near 900°C, far below the melting point of steel, so the zinc coating on galvanised sheet survives the weld
- Wets and flows freely, which cuts spatter and reduces post-weld cleaning on visible joints
- Deposits 30 to 40% elongation weld metal that absorbs movement in flexible sheet assemblies
- Bridges gaps on thin material where fusion welding burns through
- Builds up worn copper alloy surfaces without heavy dilution
- Matches silicon bronze base metal for colour and corrosion behaviour in architectural work
Confirm any corrosion or service temperature claim against the datasheet before you specify the rod.
Why Choose COREWELD CuSiA ERCuSi-A TIG Rod?
Metracore Alloys manufactures and supplies this rod against the AWS A5.7 chemical limits, with composition recorded on the test certificate that travels with each batch. Our team backs the supply with a technical team that reviews your base material and procedure before dispatch. Buyers get documented classification, confirmed diameters and packaging, and direct answers on compatibility. Download the datasheet and read the classification, composition table and recommended applications before you lock the filler into your WPS. Where the datasheet leaves a question open, ask us instead of assuming.
ERCuSi-A TIG Rod Supply and Technical Support
Metracore Alloys supplies the rod in standard diameters and pack sizes listed on the datasheet, with bulk quantities available against order. Share three details when you enquire: the base materials you plan to join, the welding process and position, and the rod diameter and length you need. That information lets our technical team confirm whether ERCuSi-A fits the application or whether another copper alloy filler suits it better. Request a quotation with your material grade and quantity.
Frequently Asked Questions About ERCuSi-A TIG Rod
What is ERCuSi-A TIG Rod used for?
Welders use it to join copper, silicon bronze and brass, and to braze-weld galvanised or thin carbon steel sheet. Repair shops also build up worn bronze bushes and pump parts with it.
What is the difference between ERCuSi-A TIG rod and ERCuSi-A MIG wire?
Chemistry stays identical. The rod comes in cut lengths for manual feeding during TIG welding, while the wire ships on spools and feeds continuously through a MIG gun for faster deposition.
Which base materials can be welded using ERCuSi-A filler metal?
Silicon bronze, brass, deoxidised copper, galvanised and zinc-coated sheet, and thin carbon steel. Dissimilar copper alloy to steel joints work too, provided a qualified procedure covers the combination.
What sizes are available for COREWELD CuSiA TIG rods?
Diameter, rod length and pack weight appear on the COREWELD CuSiA datasheet. Send your requirement to our team and we will confirm the sizes currently offered against order.
Which standard applies to ERCuSi-A TIG rod?
AWS A5.7 covers copper and copper alloy bare welding rods, with ASME SFA-5.7 as the matching section for code work. Certification scope depends on the individual product.
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