CuW75 · 75% Tungsten

W/Cu 75/25 Electrode Wheels

Name: W/Cu 75/25 Electrode Wheels
Brand: ArcTung
SKU: electrode-wheels-75-25

The workhorse alloy for seam-welding wheels

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Tungsten 75% ±2%, balance copper · MOQ: None for standard sizes · Lead time: 10–14 days standard · 20–25 days custom

Tungsten-copper electrode products on the production line

Overview

Made by infiltration, finished by machining

Our W/Cu 75/25 electrode wheels are manufactured by copper infiltration of pressed tungsten skeletons, then finish-machined to your drawing — bore keyed, profiled, and balanced for smooth tracking at welding line speed.

The 75/25 composition delivers the arc-erosion resistance of tungsten with enough conductivity for continuous seam welding on galvanized and bare steels. Machined to OD tolerances of 0/+0.5 mm with 0.02 mm runout, every wheel runs true on your welding arm.

Material values shown are typical for the grade. Per-batch composition, density and hardness reports are provided on request — see quality control.

Specification · W/Cu 75/25

Composition	W 75% ±2%, Cu balance (CuW75)
Density	≈ 15.2 g/cm³ (typical)
Hardness	≈ 195 HB (typical)
Electrical conductivity	≈ 34% IACS (typical)
Max dimensions	OD 400 mm × thickness 100 mm
Tolerances	OD 0/+0.5 mm · thickness ±0.1 mm · bore H7 · runout 0.02 mm
Edge profiles	Flat · single/double bevel · R profile · knurled
Lead time	10–14 days standard · 20–25 days custom
MOQ	None for standard sizes

Typical applications

Seam welding of galvanized steel
Roller-spot welding
Can and drum lid welding
Tube mills and strip welding

In depth

Engineering notes

Why the harder grade runs seam wheels

A seam wheel is a bearing as much as an electrode: it carries electrode force, tracks the strip at line speed, and passes thousands of amps through a moving contact. The 75/25 grade is specified where the limiting failure is mechanical — the face flattening out, the edge profile rounding over, or the wheel growing in diameter until the seam width drifts out of specification.

The extra tungsten does not eliminate wear — nothing does — but it changes the wear mode from smearing to slow, even dressing, which is what makes predictable reorder cycles possible.

Edge profiles and dressing

Profile selection drives seam consistency more than alloy choice does. The shapes we cut most often:

Flat face — general seam work and roller-spot welding where seam width tolerance is generous.
Single or double bevel — concentrates current on the sheet side; the standard choice for can-body and drum-lid seams.
R profile — for curved seams and thin strip where entry angle matters.
Knurled face — drives the strip and cleans the contact track on tube mills.

What to confirm before ordering

Three dimensions decide whether a replacement wheel drops straight onto your shaft: bore (we cut H7 as standard, keyed bores to drawing), OD against your arm geometry (0/+0.5 mm), and runout (0.02 mm — the value that stops the wheel from hunting on the seam). Send us the drawing or the worn wheel and we will match all three.

Thickness is held to ±0.1 mm and the wheel is balanced before packing, because at line speed an unbalanced wheel shows up as seam chatter long before it shows up as wear.

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