31511A73 - UTP A 73 Bronze TIG Welding Rod 3/32" 10lb Tube

Technical Overview of UTP A 73 TIG Rod

The UTP A 73 TIG Rod is a premium copper-tin alloy consumable designed for the Gas Tungsten Arc Welding (GTAW) process. Classified typically under AWS A5.7 as ERCuSn-A (Phosphor Bronze), this rod is engineered for joining and surfacing copper and copper alloys, specifically tin-bronzes and brass. The 3/32" (2.4mm) diameter provides excellent control for root passes and fill layers in medium-gauge materials.

This alloy features a high tin content (approx. 6%) which imparts high mechanical strength and excellent corrosion resistance, particularly against seawater and saline atmospheres. It is also characterized by very good sliding properties, making it a preferred choice for surfacing parts subject to metal-to-metal wear, such as shafts, guides, and bearing surfaces. The weld deposit is tough, free of porosity when applied correctly, and offers a color match close to standard bronzes.

Application & Metallurgy

UTP A 73 is versatile in its application range. It is suitable for joining copper-zinc alloys (brass) and copper-tin alloys (bronze). It can also be used for TIG brazing of ferrous metals and cast iron where lower heat input and minimal dilution are required. The rod requires a clean weld zone and typically utilizes 100% Argon shielding gas to prevent oxidation and ensure a stable arc. Preheating may be necessary for heavy sections of copper to overcome its high thermal conductivity.

• Alloy Type: Copper-Tin (CuSn6)


• Diameter: 3/32 inch (2.4mm)


• Packaging: 4.54kg (10lb) protective tube


• Current: DCEN (Direct Current Electrode Negative)