Resistance welding

Material

Name

Norms

Chemical composition %

Hardness HB

Electrical conductivity % IACS

Electrical conductivity MS/m

Thermal conductivity 20°–200°C

Softening point °C

Application

CuCr1Zr

CRM16

MHY, 2.1293, C18100, CW106C, Class RWMA 2

Cr 0,4-1, Zr 0,03-0,15, Fe 0,08, Cu rest

120-150

>75

>44

320

500

Material for electrodes, holders, arms and plates for welding devices. Optimal for welding carbon and galvanized steels. It has a very good electrical conductivity with a hardness of approx. 160HB and a high softening point. The material is suitable for cold bending. The most universal alloy used in resistance welding processes.

CuNi2SiCr

NS6

~ 2.0855, C18000, CW111C, Class RWMA 3

Ni 2,3, Si 0,6, Cr 0,6, Cu rest

160-195

>45

>26

180

480

Material for electrodes, holders and arms. Its hardness and conductivity make it often used as an alternative to the more robust in terms of mechanical properties alloy with beryllium. This material is often used in applications where beryllium alloys are contraindicated. Often commonly abbreviated as NCS.

CuCo2Be (CuCoBe, CuCoNiBe)

CB4

BC2, 2.1285, C17500 , CW104C, Class RWMA 3

Co 2,2, Be 0,5, Cu rest

220-240

>43

>25

200

480

Very good mechanical parameters and hardness combined with lower electrical conductivity than alloys with zircon and chrome. Mainly used in projection and butt welding processes. Recommended for spot and seam welding of stainless steels.

CuNi2Be

CNB spec.

2.0850, C17510, CW110C, Class RWMA 3

Co 0,3, Ni 1,9, Be 0,4, Si 0,2, Fe 0,2, Cu rest

220

>65

>38

270-320

480

Recommended for welding stainless and heat-resistant steels. High hardness and mechanical strength with good thermal and electrical conductivity. Optimal alloy for seam welding of stainless steel.

CuBe2

CBE2

BB2, 2.1247, C17200, CW101C, Class RWMA 4

Co 0,2, Be 1,8-2, Cu rest

320–360

28

16

110

300

An alloy with the best mechanical properties. Used when the element also transfers extreme mechanical forces. Recommended for injection mold inserts, grips and welding jaws. Virtually not used as a resistance welding material due to its very low electrical conductivity.

W70Cu

WCu 70/30

W70, 5182, B702, Class RWMA 10

W 70, Cu 30

160–220

44-52

>26

200

>1000

Tungsten sinter used for projection and butt welding electrodes. Welding conductive materials, e.g. copper and brass. Reusable electrodes for die sinking EDM machines and inserts for resistance upsetting and riveting. Recommended for heating teeth for hardening steel. In the case of electrodes, usually only the working insert is used from sinter.

W75Cu

WCu 75/25

W75, 5182, B702, Class RWMA 11

W 75, Cu 25

180-250

41-48

>24

190

>1000

Tungsten sinter used for projection and butt welding electrodes. Welding conductive materials, e.g. copper and brass. Reusable electrodes for die sinking EDM machines and inserts for resistance upsetting and riveting. Recommended for heating teeth for hardening steel. In the case of electrodes, usually only the working insert is used from sinter.

W80Cu

WCu 80/20

W80, 5182, B702, Class RWMA 12

W 80, Cu 20

200–280

38-45

>22

170

>1000

Tungsten sinter used for projection and butt welding electrodes. Welding conductive materials, e.g. copper and brass. Reusable electrodes for die sinking EDM machines and inserts for resistance upsetting and riveting. Recommended for heating teeth for hardening steel. In the case of electrodes, usually only the working insert is used from sinter.

W (99,95%)

Tungsten

W, 6848, B777, Class RWMA 13

W 99,95

320–370

>31

>18

125

>1000

It is used for welding conductive materials, e.g. copper and brass. Due to the price, usually only the working insert is made of tungsten, the electrode is made of CuCr1Zr material.

NiCu30Fe

Monel

2.4360, B164, Class RWMA 14

Cu 28-34, Fe 2,5, C 0,3, Mn 2, Si 0,05, S 0,024 Ni rest

150-210

>52

>30

22

1300

Nickel-copper alloy with high strength and resistance to sea water, acids and alkalis. It maintains very good mechanical properties at low temperatures, it is also adapted to high temperatures, reaching 537 ⁰C. Used for the production of electrode supports and electrode holder sleeves.

Mo (99,99%)

Molybdenum

Mo, B387, Class RWMA 13

Mo 99,99

190-220

>35

>20

130

870

Due to properties, it is more resistant to mechanical and thermal shock than tungsten. Used for welding conductive materials, e.g. copper and brass. Also used for the production of heating electrodes. Due to the price, usually only a molybdenum working insert is used, the electrode is made of CuCr1Zr.