36SILBR035 - ERCuSi-A Silicon Bronze TIG Rod .035 x 36"

Technical Overview: ERCuSi-A Silicon Bronze GTAW Filler Metal

The ERCuSi-A Silicon Bronze TIG Rod is a copper-based welding consumable designed for the Gas Tungsten Arc Welding (GTAW) process. With a diameter of 0.035" (0.9mm), this rod is specifically suited for fine detail work, low-amperage applications, and the joining of thin-gauge materials. The alloy composition typically consists of 94-96% Copper, 2.8-4.0% Silicon, and roughly 1.5% Manganese (with trace amounts of Tin and Zinc). This specific chemistry is formulated to meet AWS A5.7 specifications.

Metallurgical Properties & Performance:
The addition of silicon serves two primary functions: it acts as a powerful deoxidizer during the solidification phase, and it increases the fluidity of the molten puddle. This results in a weld deposit with high tensile strength (typically around 50,000 psi) and excellent ductility. The manganese content further enhances the mechanical properties and improves the alloy's toughness. When used on ferrous metals, the process is technically a braze-weld, as the base metal is not melted; the silicon bronze filler wets out onto the surface, creating a strong metallurgical bond without the formation of brittle intermetallic compounds often associated with copper-steel mixing.

Operational Parameters:
For optimal results, this rod should be used with Direct Current Electrode Negative (DCEN). A shielding gas of 100% Argon is standard to protect the weld pool from atmospheric contamination. Helium or Argon/Helium mixtures can be used for thicker sections to increase heat input, though this is less common with a 0.035" diameter rod. The low melting point of the alloy (approximately 1866°F / 1019°C) allows for fast travel speeds and reduced heat-affected zones (HAZ).

Applications and Usage

• Base Metal Compatibility: Silicon Bronze (C65100, C65500), Brass, Copper, Galvanized Steel, and Cast Iron.
• Surfacing: Used for overlaying surfaces subjected to corrosion.
• Automotive: Preferred for joining body panels where preserving the zinc coating is required.

Professionals rely on ERCuSi-A for its consistent feeding, stable arc characteristics, and the ability to produce high-quality joints in dissimilar metal applications. Ensure base materials are clean and free of oxides before welding for X-ray quality results.