RWMA Class 1 - Copper Zirconium C15000 | ALCAVIL Technical Data Sheet

RWMA Class 1 - Copper Zirconium (CuZr)

UNS C15000

RWMA CLASS 1

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

MINIMUM AWS J1.3 PROPERTIES - CLASS 1

Property	Minimum	Unit
Electrical Conductivity	80	% IACS
Hardness	65	HRB

CHEMICAL COMPOSITION

Cu	Zr
Balance	0.10 - 0.20%

TYPICAL PHYSICAL PROPERTIES

Property	Typical Value	Unit
Electrical Conductivity (typical)	90 - 93	% IACS
Hardness (typical, aged)	65 - 80	HRB
Thermal Conductivity	365	W/m-K
Density	8.89	g/cm3
Softening Temperature	525	C
Tensile Strength	310 - 450	MPa
Melting Point	1080	C

RECOMMENDED APPLICATIONS

Galvanized steels (Zn, Galvanneal)
Al-Si coated steels (Usibor, PHS)
Electrogalvanized steels
Seam welding of coated materials
Anti-sticking applications

KEY FEATURES

Highest electrical conductivity among RWMA alloys
Resists zinc alloying (prevents brass formation)
Rapid heat dissipation at electrode face
Reduces sticking and build-up on galvanized
Extended electrode life on coated steel lines

EQUIVALENT DESIGNATIONS

RWMA Class 1 UNS C15000 CuZr Copper Zirconium CDA 150

APPLICATION NOTE: Class 1 is specifically recommended for galvanized steel welding where high conductivity (80% IACS) helps dissipate heat rapidly, keeping electrode face temperature below the zinc-copper alloying point (~420C). This significantly reduces sticking and material build-up.