RWMA Class 3 - Copper Nickel Beryllium C17510 | ALCAVIL Technical Data Sheet

RWMA Class 3 - Copper Nickel Beryllium (CuNiBe)

UNS C17510

RWMA CLASS 3

Ref: AWS J1.3/J1.3M:2020 - Specification for Materials Used in Resistance Welding Electrodes and Related Equipment

SAFETY - BERYLLIUM: This alloy contains Beryllium (0.2-0.6%). Solid bars are safe to handle. Machining that generates fine particles requires adequate ventilation and PPE. Consult the Safety Data Sheet (SDS). Comply with OSHA 1910.1024.

MINIMUM AWS J1.3 PROPERTIES - CLASS 3

Property	Minimum	Unit
Electrical Conductivity	45	% IACS
Hardness	90	HRB

CHEMICAL COMPOSITION

Cu	Be	Ni
Balance	0.2 - 0.6%	1.4 - 2.2%

TYPICAL PHYSICAL PROPERTIES

Property	Typical Value	Unit
Electrical Conductivity (typical)	45 - 60	% IACS
Hardness (typical, aged)	90 - 102	HRB
Thermal Conductivity	208 - 210	W/m-K
Density	8.75	g/cm3
Softening Temperature	600	C
Tensile Strength	620 - 860	MPa
Melting Point	1050	C

RECOMMENDED APPLICATIONS

Projection welding of nuts (nut projection)
Projection welding of studs (stud welding)
High pressure electrodes
Welding dies and fixtures
Inserts for composite electrodes
Flash welding and upset welding

KEY FEATURES

Maximum hardness of standard RWMA alloys
Exceptional resistance to deformation
Maintains geometry under high pressure
Reduces mushrooming in projection welding
High mechanical strength (860 MPa)
Ideal for precision locators

EQUIVALENT DESIGNATIONS

RWMA Class 3 UNS C17510 CuNiBe Nickel Beryllium Copper Alloy 3 BeCu 10

APPLICATION NOTE: Class 3 C17510 is the standard choice for projection welding where high hardness (≥90 HRB) is required to resist locating forces and prevent electrode deformation. The lower conductivity (45% IACS) concentrates more heat in the weld zone, which is desirable in projection welding. For conventional spot welding applications, Class 2 is more appropriate.