## Common ground
All options are electrodes used in joining metals via soldering, brazing, or welding processes.
## Options at a glance
**8101.99 – Tungsten electrodes**
- **Defining trait:** Made entirely of tungsten, typically non-consumable and used in gas tungsten arc welding (GTAW).
- **Typical examples:** GTAW electrode tips, welding rods for TIG welding.
- **Best fit when:** The electrode is made of pure tungsten and not consumed during welding.
**8311.10 – Coated consumable base metal electrodes**
- **Defining trait:** Consumable electrodes made from base metal (e.g., steel) with a protective coating for arc stability and slag formation.
- **Typical examples:** Shielded metal arc welding (SMAW) rods like E6013.
- **Best fit when:** The electrode is coated, consumable, and used in arc welding with flux coating.
**8311.90 – Consumable base metal electrodes for soldering, brazing or welding**
- **Defining trait:** Consumable electrodes made of base metal (e.g., copper, silver alloys) used specifically in soldering/brazing/welding.
- **Typical examples:** Silver-bearing copper rods for brazing, copper wire for spot welding.
- **Best fit when:** The electrode is consumable and designed for low-temperature joining (soldering/brazing) or general welding.
**8515.90 – Electrodes for soldering/brazing/welding machines**
- **Defining trait:** General-purpose electrodes suitable only or mainly for use with dedicated machines/apparatus.
- **Typical examples:** Pre-formed electrode tips, machine-fed wires in automated systems.
- **Best fit when:** The electrode is designed for integration into a machine system (e.g., robotic welding).
**8545.19 – Carbon welding electrodes**
- **Defining trait:** Made of carbon, used primarily in carbon arc welding (CAW) or as electrodes in certain specialized processes.
- **Typical examples:** Carbon rods for carbon arc cutting/welding.
- **Best fit when:** The electrode is made of carbon and used in arc-based metal joining.
## Key differences
| Option | Material | Consumable? | Primary Use | Machine-Specific? |
|-------|----------|-------------|-------------|-------------------|
| 8101.99 | Tungsten | No (non-consumable) | GTAW | No |
| 8311.10 | Coated base metal | Yes | SMAW | No |
| 8311.90 | Base metal (uncoated) | Yes | Soldering/brazing/welding | No |
| 8515.90 | Varies | Depends | Machine-integrated processes | Yes |
| 8545.19 | Carbon | Yes | Carbon arc welding/cutting | No |
## How to choose
- Is the electrode made of tungsten? → 8101.99
- Is it coated and used in stick welding (SMAW)? → 8311.10
- Is it for soldering or brazing, and consumable? → 8311.90
- Is it designed for use in automated machines only? → 8515.90
- Is it made of carbon and used in arc welding/cutting? → 8545.19
## Overlaps & pitfalls
- **Overlaps:** A consumable base metal electrode (8311.90) may also be machine-compatible (8515.90), especially if used in automated systems.
- **Pitfall:** "Coated" vs. "uncoated" is critical—8311.10 requires coating; 8311.90 does not.
- **Priority note:** If a product fits multiple options, choose based on its **main function** (e.g., soldering vs. welding) and **material/process specificity**