EX4130-125T - Exocor ER4130 Chrome Moly TIG Rod 1/8"

High-Performance Chrome Moly Welding Filler

The Exocor ER4130 TIG Rod is a premium quality low-alloy steel welding wire designed specifically for the Gas Tungsten Arc Welding (GTAW) of high-strength chromium-molybdenum steels. With a diameter of 1/8" (3.2mm) and a standard length of 36 inches, this filler metal is engineered to match the chemical and mechanical properties of AISI 4130 and 4140 base materials. These base metals are renowned for their exceptional strength-to-weight ratio, making them the material of choice in demanding industries such as aerospace, motorsports, and heavy equipment manufacturing.

ER4130 filler metal deposits a weld bead that is capable of responding to heat treatment in a manner similar to the base metal itself. This is a critical characteristic for applications where the entire assembly will undergo quenching and tempering to achieve specific hardness and tensile strength requirements. The alloy content—primarily chromium and molybdenum—provides excellent hardenability and high-temperature strength. However, due to this hardenability, proper welding procedures are essential. Preheating the base material and maintaining correct interpass temperatures are often required to prevent cold cracking in the heat-affected zone (HAZ). Furthermore, post-weld heat treatment (PWHT) is typically recommended to relieve residual stresses and restore ductility to the weldment.

Exocor ensures that their ER4130 rods meet stringent manufacturing standards, resulting in a clean wire surface free from contaminants that could introduce porosity or inclusions into the weld pool. The consistent diameter and stiffness of the rod allow for precise manipulation by the welder, ensuring optimal bead profile and penetration. Whether you are fabricating a tubular aircraft fuselage, a competitive race car roll cage, or high-pressure piping systems, the Exocor ER4130 provides the metallurgical integrity required for safety-critical structures.

Technical Considerations

When welding with ER4130, it is important to note that the weld deposit will air-harden. Without proper thermal management, the weld zone may become brittle. Therefore, this rod is best suited for professional fabricators who understand the heat input and thermal cycle requirements of chrome-moly steels. For applications where heat treatment is not possible, other filler metals like ER70S-2 or ER80S-D2 might be considered, though they will not match the strength of the 4130 base metal as closely as ER4130 does.