The Harris 03D0C60 is a deoxidized copper TIG GTAW welding rod classified ERCu per AWS A5.7/A5.7M. Available as 1/8 in (3.2 mm) diameter, 36-inch cut lengths in a 10 lb box, it is the TIG-process companion to the Harris ERCu MIG wire line. This filler rod is engineered for welding copper, copper alloys, and dissimilar joints between copper and mild steel using the GTAW (TIG) process. As an authorized Harris Products Group item at WeldingMart, this rod ships direct from an authorized Harris distributor.
TIG welding copper demands precise heat control, adequate preheat for heavier sections, and a filler metal that resists porosity. Harris 03D0C60 ERCu contains a measured silicon and manganese deoxidizer addition that scavenges oxygen from the weld pool, dramatically reducing the porosity typical of oxygen-containing copper alloys. The result is dense, ductile weld deposits with good electrical conductivity and copper excellent corrosion resistance properties.
| Specification | Value |
|---|---|
| AWS Classification | ERCu (AWS A5.7/A5.7M) |
| Harris Part Number | 03D0C60 |
| Diameter | 1/8 in (3.2 mm) |
| Length | 36 in (914 mm) |
| Package | 10 lb (4.5 kg) box |
| Tensile Strength | ≥ 25,000 psi (172 MPa) |
| Yield Strength | ≥ 8,000 psi (55 MPa) |
| Elongation | ≥ 30% |
| Polarity | DCEN (electrode negative) for GTAW |
| Shielding Gas | 100% Ar or 75% Ar / 25% He |
| Base Metals | Copper, copper alloys, copper fittings, copper pipes, copper to mild steel |
AWS A5.7/A5.7M is the standard specification for copper and copper-alloy filler metals; consult aws.org/standards for full details. Harris Products Group publishes technical data at harriswelding.com.
- Welding copper pipe systems: High-purity copper piping for process industries, food-grade plumbing, and semiconductor fab where GTAW weld quality is required.
- Precision electrical assemblies: Bus bars, transformer leads, commutator rings, and heat sink attachment where weld deposits must preserve good electrical conductivity.
- Heat exchanger tube sheets: Welding deoxidized copper tube sheets to copper shells in condensers, evaporators, and process heat exchangers.
- Copper-to-steel transitions: Welding copper fittings or flanges to mild steel structural members using the TIG process for better arc control than MIG on critical dissimilar joints.
- Repair of copper components: Rebuilding cast copper pump impellers, valve bodies, and pressure fittings.
- Marine piping: Naval bronze, copper-nickel, and deoxidized copper tube repair in saltwater service environments requiring corrosion-resistant weld deposits.
Welding copper by GTAW requires attention to the base metal's high thermal conductivity. Use a larger tungsten electrode (1/8 in or 3/32 in) than you would for equivalent-thickness steel, and maintain a short arc length of 1/16–3/32 in. Preheat copper sections above 1/8 in thickness to 400–700 °F.
| Parameter | 1/8 in ERCu TIG Rod Typical Range |
|---|---|
| Polarity | DCEN (direct current electrode negative) |
| Shielding Gas | 100% Ar (thin); 75% Ar / 25% He (heavy sections) |
| Flow Rate | 20–35 CFH |
| Tungsten | 2% Ceriated or 1.5% Lanthanated, 3/32–1/8 in dia |
| Amperage (1/8 in copper) | 180–280 A |
| Preheat (≥ 1/8 in) | 400–700 °F (200–370 °C) |
| Arc length | 1/16–3/32 in |
| Technique | Stringer bead, slight push angle |
Helium-added shielding gas (75 Ar / 25 He) significantly improves penetration on sections thicker than 3/8 in. Use a backing bar of stainless steel or copper for butt joints on copper pipe. Avoid stopping mid-weld on copper if possible — the high thermal mass makes cold restarts prone to porosity. Post-weld slow cool (wrapped in dry insulation) reduces residual stress on heavy copper sections.
Keep Harris ERCu TIG rods in their original sealed container. Store at 40–120 °F in a dry location. Exposure to humidity causes surface oxidation that increases porosity risk; lightly contaminated rods may be wiped with a clean dry cloth before use. Do not store near acids, ammonia, or chlorinated compounds that accelerate copper tarnish.
- Store horizontally to prevent bending of cut-length rods
- Handle with clean cotton gloves — skin oils introduce hydrogen contamination at the weld pool surface
- Lightly oxidized rods can be cleaned with fine abrasive paper (400-grit) before use
Harris 03D0C60 requires a CC (constant current) GTAW power source capable of delivering DCEN at 200–300 A for typical copper sections. Lincoln Electric TIG machines such as the Square Wave TIG 200, Precision TIG 225, and the Lincoln Aspect 375 are suitable for copper TIG welding. A quality argon regulator or argon-helium blend regulator is required. For heavy copper sections, a water-cooled TIG torch is recommended to handle the extended bead times at high amperage.
See also: Harris ERCu MIG Wire 0.045 in 30 lb and all welding wire.
- What polarity should I use for TIG welding copper?
- DCEN (direct current electrode negative) is standard for GTAW with copper filler. DCEN places 70% of the heat at the base metal (anode), maximizing fusion into the highly conductive copper. DCEP is rarely used for copper TIG and risks overheating the tungsten.
- How do I TIG weld copper pipes without porosity?
- Clean the joint thoroughly with a stainless brush and solvent wipe. Preheat the copper pipe to 400–600 °F. Use 100% argon or 75 Ar / 25 He shielding at adequate flow rate (25–35 CFH). Maintain a short arc and consistent travel speed. Use only Harris ERCu deoxidized filler — undoxidized copper rods are prone to weld pool porosity from oxygen.
- Can I weld copper fittings to mild steel by TIG?
- Yes. Use ERCu filler and DCEN. Preheat the copper fitting (which is a better conductor) to equalize thermal gradient. Direct more arc heat toward the steel side to achieve fusion. The weld deposit will be copper-rich and ductile — suitable for mechanical joints but may need electrical isolation in high-voltage applications.
- What tungsten electrode should I use for copper TIG welding?
- 2% Ceriated (grey band) or 1.5% Lanthanated (gold band) tungsten performs best for DCEN copper TIG welding. Use a 3/32 in or 1/8 in diameter electrode. Grind to a sharp point for DCEN. Pure tungsten (green band) is not recommended for DCEN — it does not carry current as efficiently as ceriated or lanthanated grades.
- What diameter rod should I use for copper TIG welding?
- Match rod diameter to base metal thickness roughly. For copper under 1/8 in, use a 1/16 in rod. For 1/8–3/8 in sections, 3/32 in or 1/8 in rod (this product) is appropriate. For heavy copper over 1/2 in, a 3/16 in rod dipped frequently keeps heat input per pass reasonable.
- How is ERCu deoxidized copper TIG rod different from regular copper rod?
- Standard oxygen-bearing copper (ETP copper) contains dissolved oxygen that causes severe porosity in TIG welds. Deoxidized copper rods like ERCu contain silicon and manganese additions that react with dissolved oxygen to form slag inclusions that float out of the pool, leaving clean, dense weld metal. Always specify ERCu for TIG welding copper — never use ETP copper rod.
- Is preheat always required for copper TIG welding?
- For sections over 1/8 in thick, yes. Preheat reduces the thermal gradient at the joint, allowing proper fusion before the arc heat dissipates. Thin copper sheet (under 1/16 in) may not require preheat if welding speed is fast. For copper pipe fittings with thick walls (schedule 40+), preheat to 400–600 °F is essential.
Understanding what deoxidized copper TIG rod means for your application comes down to matching the alloy to the service condition. ERCu (deoxidized copper) is the right choice for applications involving copper pipes, copper fittings, and electrical assemblies where good electrical conductivity is non-negotiable. For applications where the weld deposit must be machinable, ERCu provides sufficient ductility for post-weld turning, drilling, and threading. Sign up for best results: use proper shielding gas coverage with 25–35 CFH argon and maintain pre-cleaning procedures as described above. Return policy: all Harris items ordered through WeldingMart are provided with standard return procedures. Order Harris 03D0C60 when the kind of welding required is TIG (GTAW) process on copper or copper alloy components where a low-porosity, high-conductivity deposit is the primary requirement.
TIG welding copper with Harris 03D0C60 ERCu deoxidized copper GTAW rod provides maximum control over heat input on pure copper components — critical for electrical conductors, copper heat exchangers, precision copper tubing, and copper castings where the parent metal properties must be preserved adjacent to the weld. The GTAW process deposits pure copper with minimal spatter, contamination, or porosity compared to GMAW on thin copper sections. Harris 03D0C60 provides 1/8 in x 36 in ERCu classified rod in a 10-piece box for repair and small-volume production TIG work.
| Parameter | 1/8 in ERCu TIG Typical |
|---|---|
| Current | DCEN (electrode negative) |
| Amperage | 120–220 A (depending on base metal thickness) |
| Shielding Gas | 100% Ar (thin to medium copper); 75% He/25% Ar (thick copper) |
| Flow Rate | 20–30 CFH |
| Electrode | 2% Thoriated or 2% Ceriated, 1/8 in, pointed |
| Preheat | 400–600 °F for copper > 1/4 in (essential due to thermal conductivity) |
| Arc Length | Short — 1/8 to 3/16 in; copper demands tight arc for heat concentration |
| Travel Speed | Fast — copper pools run fluid; slow travel causes excessive heat buildup |
Copper TIG welding is significantly more challenging than steel or aluminum TIG welding for two reasons: copper's thermal conductivity rapidly dissipates arc heat away from the joint, and copper has a narrow solid-liquid temperature range — it transitions directly from solid to liquid with minimal mushy zone. This means preheating is non-optional for sections over 1/4 in, and the welder must react quickly to puddle formation changes. On preheated copper, the puddle forms almost immediately and runs very fluid — the arc manipulation skill requirement is higher than for steel.
- Thin copper sheet (18–22 gauge): TIG's independent heat and filler control allows lower heat input than MIG, producing less distortion on thin copper panels and decorative copper sheet work.
- Copper heat exchanger tube welding: Precision TIG welding of copper tube-to-tube sheet joints in HVAC coil and heat exchanger assembly, where porosity-free joints with full penetration are required without burn-through on thin tube walls.
- Electrical conductor repair: Motor winding repairs, transformer lead repairs, and electrical bus work where the weld must be free of inclusions and maintain electrical conductivity. TIG produces cleaner deposits than MIG in these applications.
- Copper casting and sculpture repair: Fine detail repair work on bronze statues, architectural copper cladding, and casting defects where bead size must be minimized and finish quality is critical.
- Dissimilar copper-to-copper alloy joining: Joining pure copper (C110) to phosphor bronze, beryllium copper, or brass where a controlled, low-dilution TIG deposit preserves base metal properties adjacent to the joint.
Porosity is the most common weld quality issue in copper TIG welding. Sources and prevention:
| Porosity Source | Prevention |
|---|---|
| Hydrogen from base metal moisture/contamination | Clean with acetone; preheat to drive off moisture |
| Oxygen from air entrainment in shielding gas | Use pure Ar (99.99%); check hose connections for leaks; increase flow to 25–30 CFH |
| Dissolved oxygen in copper base metal | Confirm base metal is deoxidized (ETP copper C110 has dissolved O₂ — use OFHC C101 or phosphor-deoxidized C122 for best weldability) |
| Insufficient deoxidizer in filler rod | ERCu contains phosphorus and silicon as deoxidizers — correct. Verify rod is classified ERCu, not ER70S-6 which has no copper deoxidizer chemistry |
| Contaminated tungsten electrode | Regrind electrode after any contamination event; use dedicated tungsten for copper work |
The phosphorus content (0.15–0.35% P) in Harris ERCu rod acts as an in-pool deoxidizer, combining with residual oxygen to form slag inclusions that float out of the weld pool. This is the same deoxidizing mechanism as silicon and manganese in steel filler wire — the deoxidized copper designation refers to this added deoxidizer content, not just the absence of oxygen in the rod itself.
Harris 03D0C60 copper TIG rod is available at WeldingMart. See Harris Deoxidized Copper MIG Wire 0.045 in 30 lb for production MIG copper welding, and all welding alloys and rod products.
TIG welding copper with Harris 03D0C60 ERCu deoxidized copper GTAW rod provides maximum control over heat input on pure copper components — critical for electrical conductors, copper heat exchangers, precision copper tubing, and copper castings where the parent metal properties must be preserved adjacent to the weld. The GTAW process deposits pure copper with minimal spatter, contamination, or porosity compared to GMAW on thin copper sections. Harris 03D0C60 provides 1/8 in x 36 in ERCu classified rod in a 10-piece box for repair and small-volume production TIG work.
| Parameter | 1/8 in ERCu TIG Typical |
|---|---|
| Current | DCEN (electrode negative) |
| Amperage | 120–220 A (depending on base metal thickness) |
| Shielding Gas | 100% Ar (thin to medium copper); 75% He/25% Ar (thick copper) |
| Flow Rate | 20–30 CFH |
| Electrode | 2% Thoriated or 2% Ceriated, 1/8 in, pointed |
| Preheat | 400–600 °F for copper > 1/4 in (essential due to thermal conductivity) |
| Arc Length | Short — 1/8 to 3/16 in; copper demands tight arc for heat concentration |
| Travel Speed | Fast — copper pools run fluid; slow travel causes excessive heat buildup |
Copper TIG welding is significantly more challenging than steel or aluminum TIG welding for two reasons: copper's thermal conductivity rapidly dissipates arc heat away from the joint, and copper has a narrow solid-liquid temperature range — it transitions directly from solid to liquid with minimal mushy zone. This means preheating is non-optional for sections over 1/4 in, and the welder must react quickly to puddle formation changes. On preheated copper, the puddle forms almost immediately and runs very fluid — the arc manipulation skill requirement is higher than for steel.
- Thin copper sheet (18–22 gauge): TIG's independent heat and filler control allows lower heat input than MIG, producing less distortion on thin copper panels and decorative copper sheet work.
- Copper heat exchanger tube welding: Precision TIG welding of copper tube-to-tube sheet joints in HVAC coil and heat exchanger assembly, where porosity-free joints with full penetration are required without burn-through on thin tube walls.
- Electrical conductor repair: Motor winding repairs, transformer lead repairs, and electrical bus work where the weld must be free of inclusions and maintain electrical conductivity. TIG produces cleaner deposits than MIG in these applications.
- Copper casting and sculpture repair: Fine detail repair work on bronze statues, architectural copper cladding, and casting defects where bead size must be minimized and finish quality is critical.
- Dissimilar copper-to-copper alloy joining: Joining pure copper (C110) to phosphor bronze, beryllium copper, or brass where a controlled, low-dilution TIG deposit preserves base metal properties adjacent to the joint.
Porosity is the most common weld quality issue in copper TIG welding. Sources and prevention:
| Porosity Source | Prevention |
|---|---|
| Hydrogen from base metal moisture/contamination | Clean with acetone; preheat to drive off moisture |
| Oxygen from air entrainment in shielding gas | Use pure Ar (99.99%); check hose connections for leaks; increase flow to 25–30 CFH |
| Dissolved oxygen in copper base metal | Confirm base metal is deoxidized (ETP copper C110 has dissolved O₂ — use OFHC C101 or phosphor-deoxidized C122 for best weldability) |
| Insufficient deoxidizer in filler rod | ERCu contains phosphorus and silicon as deoxidizers — correct. Verify rod is classified ERCu, not ER70S-6 which has no copper deoxidizer chemistry |
| Contaminated tungsten electrode | Regrind electrode after any contamination event; use dedicated tungsten for copper work |
The phosphorus content (0.15–0.35% P) in Harris ERCu rod acts as an in-pool deoxidizer, combining with residual oxygen to form slag inclusions that float out of the weld pool. This is the same deoxidizing mechanism as silicon and manganese in steel filler wire — the deoxidized copper designation refers to this added deoxidizer content, not just the absence of oxygen in the rod itself.
Harris 03D0C60 copper TIG rod is available at WeldingMart. See Harris Deoxidized Copper MIG Wire 0.045 in 30 lb for production MIG copper welding, and all welding alloys and rod products.
Harris deox copper TIG filler metal (ERCu) is classified for GTAW of copper base metals, joining copper to steel surfaces, and copper base materials repair where color match and deposit purity are critical. Deox copper produces porosity free weld deposits when used with proper technique — the phosphorus deoxidizer in ERCu combines with residual oxygen in the weld pool, floating slag to the surface and leaving a clean, dense copper deposit with good color match to the parent metal.
For easy identification of ERCu rods at the workstation, Harris 03D0C60 rods display the copper color typical of the alloy — unlike steel TIG rod (silver-gray) or aluminum rod (bright aluminum). This easy identification prevents accidentally using the wrong filler metal in shops where multiple alloy systems are in use. The model number 03D0C60 designates the 1/8 in diameter, 36 in length, 10-piece box specification.
When joining copper to steel surfaces, ERCu filler metal deposits pure copper that wets both the copper and steel base metals when preheat is applied. High strength joints on copper-to-steel dissimilar welds depend on achieving complete fusion on both sides of the joint. For copper base metals, the filler metal chemistry produces deposits that match the electrical and thermal conductivity of the base metal — critical for bus bars, winding repairs, and heat exchanger tube joining. The produces high purity deposits characteristic of ERCu filler metal ensures that weld zones maintain the functional properties that make copper valuable in electrical and thermal applications. TIG rods in the 1/8 in size are appropriate for copper pipe, plate, and casting work in the medium-thickness range.
WeldingMart offers multiple options for deoxidized copper TIG rod including 1/8 in x 36 in (03D0C60) reviewed here, and other diameter options. The 1/16 in and 3/32 in sizes are appropriate for thin copper sheet and precise copper repair; the 1/8 in is the standard for general copper TIG joining and casting repair. Reviews from customers who weld copper to steel confirm that 03D0C60 produces good electrical conductivity in the deposited weld metal — important for bus bar repairs and motor winding work where conductivity loss at the joint is unacceptable.
For trouble free welds on copper using TIG, the critical equipment items are: a dedicated copper stainless brush for cleaning, 100% Ar shielding gas cylinder, and a pointed thoriated or ceriated tungsten electrode matched to the amperage range. Email WeldingMart's technical support if you need help selecting rod diameter for a specific copper TIG application. The x 36 in length of each rod allows extended dip-and-feed without repositioning on long horizontal pipe joints. Reviews indicate that good electrical conductivity exists in the deposited weld metal when proper preheat and clean copper base metal are maintained. The 10-piece box (10 x 36 in rods) in the 1/8 in 1 8 diameter provides a sufficient supply for small repair projects and trial use before ordering full-case quantities.