---
title: "AMPCOLOY® 97 and AMPCOLOY® 99: Composition, Status, and Applications"
description: Learn about AMPCOLOY® 97 and AMPCOLOY® 99, their RWMA classifications, availability, and why AMPCOLOY® 972 has replaced AMPCOLOY® 97 in most markets while AMPCOLOY® 99 remains restricted in Europe.
---

[Skip to content](https://academy.ampcometal.com/migration/en/knowledge/ampcoloy-97-ampcoloy-99-resistance-welding#main-content)

English

Show submenu for translations

![logo-1.png\]](https://academy.ampcometal.com/hs-fs/hubfs/AMPCO%20CD%20elements/logo-1.png?height=40&name=logo-1.png)

Open main navigation

Close main navigation

- English
  
  Show submenu for translations
- Contact us

 Contact us

 Hello. How can we help you?

- There are no suggestions because the search field is empty.

1. [Knowledge Hub](https://academy.ampcometal.com/migration/en/knowledge?hsLang=en)
2. [Application & Process Guidance](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en)
3. [Resistance Welding](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en#resistance-welding)

# AMPCOLOY® 97 and AMPCOLOY® 99: Composition, Status, and Applications

## Understanding Two Legacy Resistance Welding Alloys and Their Modern Equivalents

AMPCOLOY® 97 is a copper-chrome (CuCr) alloy classified as RWMA Class 2. It has largely been replaced by AMPCOLOY® 972, a copper-chrome-zirconium (CuCrZr) alloy also in RWMA Class 2, which offers improved performance. AMPCOLOY® 97 can still be produced on request, with 50.8 mm diameter available in stock in Woerden.

AMPCOLOY® 99 is a copper-cadmium (CuCd) alloy classified as RWMA Class 1. It remains in use in the United States but is no longer used in European markets due to RoHS (Restriction of Hazardous Substances) regulations prohibiting the use of cadmium. AMPCOLOY® 99 is available through AMPCO METAL in the USA.

Both alloys are used in resistance welding applications corresponding to their respective RWMA classifications.

 

- [Fabrication & Processing](https://academy.ampcometal.com/migration/en/knowledge/fabrication-processing?hsLang=en#main-content)

    - [Forming & Bending](https://academy.ampcometal.com/migration/en/knowledge/fabrication-processing?hsLang=en#forming-bending)
    - [Welding & Joining](https://academy.ampcometal.com/migration/en/knowledge/fabrication-processing?hsLang=en#welding-joining)
    - [Cutting & Shearing](https://academy.ampcometal.com/migration/en/knowledge/fabrication-processing?hsLang=en#cutting-shearing)
- [Application & Process Guidance](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en#main-content)

    - [Lubrication & Surface Treatment](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en#lubrication-surface-treatment)
    - [Thermoforming & Plastic Processing](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en#thermoforming-plastic-processing)
    - [Oil, Gas & Chemical](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en#oil-gas-chemical)
    - [Temperature & Thermal Limits](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en#temperature-thermal-limits)
    - [Bearings & Wear Components](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en#bearings-wear-components)
    - [Specialty & High-Demand Environments](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en#specialty-high-demand-environments)
    - [Plastic Injection Molding](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en#plastic-injection-molding)
    - [Metal Forming & Deep Drawing](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en#metal-forming-deep-drawing)
    - [Tube Bending & Forming](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en#tube-bending-forming)
    - [Resistance Welding](https://academy.ampcometal.com/migration/en/knowledge/application-process-guidance?hsLang=en#resistance-welding)
- [Machining & Tooling](https://academy.ampcometal.com/migration/en/knowledge/machining-tooling?hsLang=en#main-content)

    - [Cutting Tool Selection](https://academy.ampcometal.com/migration/en/knowledge/machining-tooling?hsLang=en#cutting-tool-selection)
    - [Grinding & Surface Finishing](https://academy.ampcometal.com/migration/en/knowledge/machining-tooling?hsLang=en#grinding-surface-finishing)
- [Materials & Coatings](https://academy.ampcometal.com/migration/en/knowledge/materials-coatings?hsLang=en#main-content)

    - [Coating Properties & Selection](https://academy.ampcometal.com/migration/en/knowledge/materials-coatings?hsLang=en#coating-properties-selection)
    - [Tribological Properties](https://academy.ampcometal.com/migration/en/knowledge/materials-coatings?hsLang=en#tribological-properties)
    - [Thermal Properties](https://academy.ampcometal.com/migration/en/knowledge/materials-coatings?hsLang=en#thermal-properties)
    - [Standards & Designations](https://academy.ampcometal.com/migration/en/knowledge/materials-coatings?hsLang=en#standards-designations)
    - [Alloy Selection & Comparison](https://academy.ampcometal.com/migration/en/knowledge/materials-coatings?hsLang=en#alloy-selection-comparison)
    - [Mechanical Properties](https://academy.ampcometal.com/migration/en/knowledge/materials-coatings?hsLang=en#mechanical-properties)
    - [Physical & Electrical Properties](https://academy.ampcometal.com/migration/en/knowledge/materials-coatings?hsLang=en#physical-electrical-properties)
- [Heat Treatment & Thermal Processing](https://academy.ampcometal.com/migration/en/knowledge/heat-treatment-thermal-processing?hsLang=en#main-content)

    - [Stress Relieving](https://academy.ampcometal.com/migration/en/knowledge/heat-treatment-thermal-processing?hsLang=en#stress-relieving)
    - [Grade Conversion & Heat Treatment Upgrades](https://academy.ampcometal.com/migration/en/knowledge/heat-treatment-thermal-processing?hsLang=en#grade-conversion-heat-treatment-upgrades)
    - [Supply Condition & Post-Delivery Processing](https://academy.ampcometal.com/migration/en/knowledge/heat-treatment-thermal-processing?hsLang=en#supply-condition-post-delivery-processing)

[![Chill listening crop-3](https://academy.ampcometal.com/hs-fs/hubfs/AMPCO%20CD%20elements/logo-1.png?width=98&height=25&name=logo-1.png "Chill listening crop-3")](https://academy.ampcometal.com/knowledge?hsLang=en)

ampcometal.com Help Center

Copyright © 2026, AMPCO METAL S.A.