CuW70 · 70% Tungsten

W/Cu 70/30 Electrode Wheels

Name: W/Cu 70/30 Electrode Wheels
Brand: ArcTung
SKU: electrode-wheels-70-30

Higher conductivity for heavy-current welding

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Tungsten 70% ±2%, balance copper · MOQ: None for standard sizes · Lead time: 10–14 days standard · 20–25 days custom

Vacuum sintering workshop where tungsten-copper wheels are produced

Overview

Made by infiltration, finished by machining

When your seam-welding schedule demands more current, the 70/30 grade moves heat faster: roughly 25% higher electrical conductivity than 75/25, at the cost of some erosion life. Many customers stock both grades and switch by weld schedule.

Same production route — infiltration, sintering, finish machining — and the same tolerance package: OD 0/+0.5 mm, bore H7, runout 0.02 mm. Supplied with a batch traceability record on request.

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 70/30

Composition	W 70% ±2%, Cu balance (CuW70)
Density	≈ 14.5 g/cm³ (typical)
Hardness	≈ 175 HB (typical)
Electrical conductivity	≈ 42% 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

Heavy-current seam welding
Welding of coated and high-resistivity steels
Projection welding fixtures
General resistance-welding consumables

In depth

Engineering notes

Where the extra conductivity pays

Roughly 25% higher conductivity than 75/25 means less resistive heat generated in the wheel itself for the same current schedule. On thick stock, high-speed lines, or any schedule already near the ceiling of your transformer and secondary circuit, that difference shows up as a cooler wheel face, less sticking, and a wider usable current window.

The trade is erosion life: the softer composite dresses faster under the same electrode force. On lines that dress on a fixed interval anyway, the faster dress rate costs little — which is why 70/30 is the default on can-body and tube-mill lines that maintain their wheels on schedule.

Switching between grades

Both grades are produced on the same infiltration line and machined on the same cell, so switching a station from 75/25 to 70/30 — or running one station on each — is a purchasing decision, not a process change. Bore, OD, profile and tolerances are identical across grades; only the material values differ.

A practical approach many customers take: stock 75/25 for the stations where wheel life limits the campaign, 70/30 for the stations where heat limits it. Both stay in supply from stock shapes with no minimum order.

Traceability and inspection

Every batch is checked for composition, density and hardness, and a batch traceability record ships on request. For buyers running automotive or food-can lines that require incoming inspection paperwork, we can include dimensional inspection records per wheel — bore, OD, runout and thickness — against the drawing revision you hold.

Third-party stamped test reports to ASTM B702 are available when your quality system needs an external certificate rather than a factory report.

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