921.T.020.16 - Weld Mold 921 P-20 Tool Steel TIG Rod .020" (25 Pack)

Precision P-20 Tool Steel Restoration

The Weld Mold 921 TIG Rod is a specialized consumable engineered specifically for the repair and restoration of P-20 tool steel. In the high-stakes world of industrial mold making and maintenance, maintaining the integrity of the base metal is paramount. This rod is formulated with a precise Chrome-Molybdenum chemistry that mirrors the metallurgical structure of standard P-20 steel (AISI P20). This ensures that when the weld deposit is laid down, it responds to heat treatment, machining, and finishing processes in the exact same manner as the surrounding material.

One of the critical challenges in mold repair is achieving a repair that does not show a "halo" or distinct line after texturing or photo-etching. The Weld Mold 921 addresses this by providing a deposit that is fully dense, free of porosity, and chemically balanced to accept acid etching and polishing uniformly. With a typical hardness of 28-32 HRC in the as-welded condition, it provides immediate toughness and stability, yet remains machinable without the need for immediate annealing in many minor repair scenarios.

This specific SKU offers the rod in an ultra-fine 0.020-inch diameter. This dimension is critical for micro-TIG applications where heat input must be minimized to prevent distortion or the heat-checking of the expensive mold surface. The small diameter allows the operator to place filler metal with pinpoint accuracy into hairline cracks, small dings on parting lines, or eroded gate areas. Packaged in a convenient 25-piece box, this product is intended for maintenance departments and tool and die shops requiring high-quality, low-volume consumables for precision tasks.

Technical Specifications:

• Alloy Group: Chrome-Moly Tool Steel
• Base Metal Compatibility: P-20, 4130, 4140, and similar medium carbon low alloy steels.
• Hardness: Typically 28-32 RC as welded; flame hardenable to higher values.
• Heat Treatment: Responds to standard P-20 heat treat cycles.