Projection Welding Electrodes

Luvata is one of the most respected manufacturers of resistance-welding electrodes.

Our projection welding caps are used to weld nuts, bolts or other fastening assembly to other metal parts.

A-Trode® is the universal cap electrode for resistance welding of light-to-medium gauge coated and uncoated steels. A-Trode's freedom from oxygen allows us to alloy the copper with the optimum levels of chrome and zirconium.

Alloy: Copper Chrome Zirconium (CuCrZr)

Quality Specifications

Alloy	C18150 CuCrZr, EN ISO 5182 A2/2, DIN 17666 Wn 2.1293, RWMA Class II
Chemical composition	Cr 0.7% to 1.2%, Zr 0.06% to 0.15%. Others max. 0.2%, Cu balance
Physical material properties at 20⁰C	Mass: 8.9g/cm3 Specific heat: 376 J/kg.K Thermal conductivity: 320 W/m.K Expansion coefficient (20-300^oC): 17.0 x 10-6 m/mK Electric conductivity: min. 43 S/m (solution annealed and hardened) min 74% IACS Softening temperature: min. 500°C
Dimensions and tolerances	To ISO 5821 or other standards as required. Special electrodes to customer drawing
Packaging	Most items in cartons of 500 pieces.
Documentation	Acceptance test certificate EN 10204 3.1 B possible if desired against a charge.
Area of application	Male and female resistance welding electrodes. Backing dies - series and indirect Seam welding wheels Projection welding electrodes

Mechanical Specifications - Quality

Form of supply	Tensile strength [N/mm2]	0.2% Offset yield strength [N/mm2]	Elongation AS [%]	Hardness
Electrodes	≥ 490	≥ 430	≥ 15	≥ 172

Physical Properties

Hardness at ambient temperature:	Minimum 80 HRB
Conductivity:	Minimum 80% IACS

Kova®- the 'beryllium-free' alloy made of copper, nickel, silicon and chromium (CuNiSiCr).

Kova is a high-strength, beryllium-free precipitation hardening alloy with medium-high electrical and thermal conductivity.

Kova is the perfect replacement for harmful beryllium copper alloys.

Benefits:

Easy to machine and form
Extended use due to hardness
High strength with moderate thermal and electrical conductivity
Easy disposal

Applications:

Adaptors
Shanks
Projection welding electrodes
Weld wheels

Specifications:

Alloy	Kova®NK203 is a RWMA Class III alloy
Chemical composition	Ni 1.8 - 3.0%; Si 0.4 - 0.8%; Cr 0.1 - 0.8%; Fe 0.15% max;. Cu balance
Physical, electrical and thermal properties	Density: 8.8 kg/dm³Coefficient of linear expansion: 0.0000175 1/K Specific heat: 380 J/(kg x K) Melting temperature: 1020 - 1040°C Electric conductivity: 22 - 24 MS/m Electrical conductivity (% IACS): 38 - 42% Electrical resistivity (mass): 0.37 - 0.41 g/m³Thermal conductivity (20°C): 220 W/Km
Documentation	Acceptance test certificate EN-CEN/TS 13388:2008

Errors and omissions excepted. Values given are industry standards.

Mechanical Specifications

Form of supply	Tensile strength [N/mm2]	0.2% Offset yield strength [N/mm2]	Elongation AS [%]	Hardness HV
Adapters	650-800	650-750	9-15	220-225

The Nitrode® cap is a cold-formed alloy of dispersion strengthened copper with aluminum oxide.

Nitrode demonstrates superior weld performance on a variety of steels. It resists mushrooming on the contact surface, allowing more welds before tip dressing, heat stepping or tip change.

No other cap electrode can match Nitrode for its cost-effective, high quality performance in resistance-welding applications.

Nitrode consistently outperforms copper chrome and copper chrome zirconium electrodes by resisting annealing.

Advantages

Longer weld life
Non-stick
Reduces energy requirements
Works on all steels
Lowers manufacturing costs

Quality Properties*

Alloy	C15760 CuAl₂O₃, EN ISO 5182 C20/1, RWMA Class 20
Chemical composition	Aluminum 0.60% by weight as Al₂O₃ Cu balance
Physical material properties at 20^oC	Density: 8.81g/cm3 Thermal conductivity: 322 W/m.K Expansion coefficient (20-150°C): 16.6 x 10^-6 m/mK Electric conductivity: 78% IACS Softening temperature: 1083°C
Dimensions and tolerances	To ISO 5821 or other standards as required. Special electrodes to customer drawing.
Packaging	Most items in cartons of 500 pieces
Documentation	Acceptance test certificate EN 10204 3.1 B possible if desired against a charge.
Area of application	Male and female resistance welding electrode Backing dies - series and indirect Projection welding electrodes

Mechanical Properties*

Form of supply	Tensile strength MPa	Yield strength MPa	Elongation [%]	Hardness HV
Electrodes	489 - 537	393 - 441	18 - 23%	160

Physical Properties*

Hardness at ambient temperature:	83 HRB
Conductivity:	78% IACS

*Errors and omissions excepted. Values given are industry standards. Actual properties will vary dependent upon amount of cold work.

Traceability
All materials are fully traceable. Nitrode® electrodes can be recognized by their single knurls markings.

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