2865-FCO-11.36 - JOW 40 .045 Flux Cored Build-Up Wire 25lb Spool

Technical Overview of JOW 40 Build-Up Wire

The Josef Gas JOW 40 is a specialized flux-cored welding wire designed specifically for build-up applications and buffer layers. Supplied in an 11.36kg (approximately 25lb) spool with a 0.045-inch diameter, this consumable is engineered to address the critical need for restoring dimensional tolerance to worn industrial components. Unlike standard joining wires, JOW 40 is formulated to produce a weld deposit that exhibits high compressive strength and excellent resistance to plastic deformation under load, while remaining ductile enough to prevent cracking.

One of the primary technical advantages of the JOW 40 alloy is its machinability. In maintenance and repair operations (MRO), components such as shafts, trunnions, and rollers often wear down beyond their operational limits. JOW 40 allows the welder to rebuild these surfaces to slightly oversized dimensions, which can then be machined back to precise specifications. The deposit hardness is typically in the range of 30-40 HRC (Rockwell C), which strikes an optimal balance: it is hard enough to resist metal-to-metal wear and deformation, yet soft enough to be turned or milled using standard tooling without excessive difficulty.

Furthermore, JOW 40 serves as an exceptional underlayment or cushion layer. When applying extremely hard, brittle hardfacing alloys (such as chrome carbides) to a mild steel base, the difference in hardness and thermal expansion can lead to spalling or cracking. JOW 40 acts as a metallurgical bridge, absorbing impact shocks and preventing the harder top layer from caving into a softer base metal. This makes it indispensable for heavy equipment repair in mining, construction, and agriculture where parts are subjected to both impact and abrasion.

The wire is designed for smooth feedability in standard MIG equipment capable of running flux-cored or metal-cored wires. Its formulation ensures stable arc transfer, good wetting action, and a bead profile that requires minimal post-weld grinding before machining. It is suitable for use on carbon steels and low-alloy steels, making it a versatile addition to any industrial welding inventory.