ER958T-332 - Weldmold 958 H-12 Tool Steel TIG Rod 3/32" (10lb Tube)

Weldmold 958 (H-12) TIG Rod Overview

The Weldmold 958 TIG Rod is a premium H-12 tool steel alloy designed specifically for the repair and maintenance of hot and cold work tooling. Manufactured to strict quality standards, this 3/32-inch diameter filler metal is essential for industrial tool and die shops facing high-wear and high-temperature environments. The H-12 grade is a tungsten-chromium-molybdenum alloy known for its deep hardening capabilities and exceptional resistance to thermal fatigue, often referred to as "heat checking." This makes it a superior choice for applications where tools are subjected to repeated heating and cooling cycles.

Packaged in a durable 10lb tube, these 36-inch cut lengths are chemically cleaned to ensure a contaminant-free weld pool, which is critical when working with sensitive tool steels. The 3/32" size offers excellent puddle control, allowing welders to perform precise build-ups on edges, corners, and detailed die cavities without excessive heat input. This control helps minimize the heat-affected zone (HAZ) and reduces the risk of cracking in the base metal.

Technical Application & Performance

Weldmold 958 is engineered to withstand severe service conditions. It exhibits high strength at elevated temperatures, making it suitable for hot headers, upsetters, and hot shear blades. Unlike some lower-grade alloys, H-12 maintains its hardness even after prolonged exposure to heat, ensuring that repaired tools retain their dimensional stability and wear resistance. When welding with this alloy, proper preheat and post-weld heat treatment (PWHT) procedures are recommended to achieve optimal mechanical properties and prevent brittle failure.

At Josef Gas, we understand the critical nature of tool and die repair. Using the correct filler metal like Weldmold 958 can significantly extend the service life of expensive tooling components, reducing downtime and replacement costs. Whether you are repairing a cracked forging die or rebuilding a worn punch, this H-12 rod provides the metallurgical integrity required for industrial success.

Key Specifications

• Alloy Type: H-12 Tool Steel (Weldmold 958)


• Diameter: 3/32 inch


• Length: 36 inches


• Packaging: 10 lb Tube


• Current: DCEN (Direct Current Electrode Negative)


• Shielding Gas: 100% Argon