TG418093638 - Lincoln Techalloy 418 (ERNiCu-7) TIG Rod - 3/32 Inch - 10lb Tube

Smooth TIG Welding for Monel and Marine Alloys

When you are under the hood welding exotic alloys, you need a filler metal that flows smoothly and wets out perfectly. Lincoln Techalloy 418 (ERNiCu-7) is the go-to TIG rod for welders working with Monel and other nickel-copper alloys. If you are repairing marine heat exchangers, fabricating salt-water piping, or joining dissimilar metals like Nickel 200 to copper-nickel, this 3/32-inch rod gives you the control you need to lay down defect-free, aesthetically pleasing beads.

The first thing you will notice with Techalloy 418 is the consistency. Lincoln Electric's manufacturing process ensures that the rod is clean and straight, feeding easily through your hand without the drag or stutter caused by poor surface finish. The alloy is formulated to minimize porosity, a common headache when welding copper-based alloys. With the right shielding gas—typically pure Argon for thinner sections or an Argon/Helium mix for better penetration on thicker stock—the puddle is fluid and responsive, allowing you to manipulate the weld pool for optimal tie-in at the toes.

Dissimilar metal welding can be tricky, but Techalloy 418 acts as a forgiving bridge. It is excellent for overlaying steel to provide a corrosion-resistant surface or for joining carbon steel to nickel-copper alloys (with proper buttering techniques). The resulting weld deposit is tough and ductile, capable of withstanding the harsh corrosive environments found in offshore rigs and chemical plants. You won't have to worry about the weld cracking as it cools, provided standard preheat and interpass temperature controls are followed.

Packaged in a durable 10lb tube, these 36-inch cut lengths are protected from moisture and contamination until you are ready to use them. Whether you are doing precision bench work or out-of-position repairs in the field, Techalloy 418 gives you the confidence that your welds will pass X-ray and hold up over time. It’s the professional choice for serious TIG work on nickel-copper materials.