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Alloy copper classification

Group	Designation	Assortment	Hardness min. HB	Electrical conductivity min. MS/m	Electrical conductivity min. %IACS	Softening temperature (°C)
A1	Cu-ETP	< Ø25	86	56	96	150
		> Ø25	81
		Other forged products	50

Application:

Widely used for shunts and cables. High conductivity.

Group	Designation	Assortment	Hardness min. HB	Electrical conductivity min. MS/m	Electrical conductivity min. %IACS	Softening temperatura (°C)
A2	CuCr1Zr	< Ø25	160	43	75	480
		Ø25 ÷ Ø50	140
		Ø51 ÷ Ø200	120
		Other products (flat bars, seam welding wheels, and other )	120

Application:

Stressed current-carrying parts including the electrodes, holders and arms.
For spot, seam and projection welding. Welding of mild steel and coated steel.

Group	Designation	Assortment	Hardness min. HB	Electrical conductivity min. MS/m	Electrical conductivity min. %IACS	Softening temperature (°C)
A3/1	CuCo2Be CuCoNiBe	< Ø25	230	25	43	480
		> Ø25	220
		Other products (flat bars, seam welding wheels, and other)	210
A3/2	CuNi2Si	Bars, Flat bars and other	190	24	42

Application:

Stressed current-carrying parts including the electrodes, holders and arms.
For spot, seam and projection welding. Welding of stainless and heat-resistant steels

Group	Designation	Assortment	Hardness min. HB	Electrical conductivity min. MS/m	Electrical conductivity min. %IACS	Softening temperature (°C)
B	W75Cu Cu25	Round bars	210	17	29	800
	Mo Mo 99,5		150
	W W99,5		400

Application:

Inserts, tips for projection and butt welding. Welding of conductive materials (copper and brass).