Spot Welding Electrodes

Expertise for the optimal weld, that helps end-users maximize their production efficiencies

Our spot welding caps are used on robotic welding machines, primarily in automotive applications.

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

The Cupal® cap is a cold-formed alloy of dispersion strengthened copper (DSC) with aluminum oxide. It consistently outperforms copper chrome and copper chrome zirconium electrodes in resistance to annealing, consistent electrical conductivity, electrode life and lower maintenance costs.

Advantages of Cupal welding electrodes:

longer weld life
anti-stick characteristics
reduces energy requirements
works on all steels
resists mushrooming for improved up-time

Quality Properties*

Alloy	C15725 CuAl₂O₃, EN ISO 5182 C20/1, RWMA Class 20
Chemical composition	Aluminum 0.25% by weight as Al₂O₃ Cu balance
Physical material properties at 20^oC	Density: 8.86g/cm³ Thermal conductivity: 344 W/m.K Expansion coefficient (20-150°C): 16.6 x 10^-6 m/mK Electric conductivity: 87% 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	393 - 441	310 - 358	16 - 21%	130

Physical Properties*

Hardness at ambient temperature:	72 HRB
Conductivity:	87% 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. A Cupal® electrode can be recognized by its four (4) pair of knurls evenly spaced around the periphery of the electrode.

H-Trode® - the ideal cap electrode for resistance welding of 5000, 6000 and 7000 grade aluminum components.

The combination of advanced copper metallurgy and our cold-forming technology gives you an electrode that outperforms conventional electrodes when welding aluminum.

H-Trode's superior conductivity means that the maximum electrical resistance in an assembly is clearly between the aluminum sheets. This reduces the heat generated between the sheets and electrode, which in turn reduces sticking.

Benefits:

Compatible with conventional spot welding equipment
Increased productivity
Cost-effective electrode for aluminum welding
High conductivity
Non-stick properties

Compatible with conventional spot welding equipment
Alternative welding solutions have been developed for aluminum, but equipment is expensive, large and more difficult to implement than conventional spot welding. H-Trode electrodes enable stable spot welding of aluminum alloys using conventional spot welding equipment.

Increased productivity
Compared with alternative joining methods, spot welding using H-Trode electrodes and standard dressing equipment significantly increases productivity.

Most cost-effective electrode for aluminum welding
H-Trode's increased life expectancy, maintenance savgins and consistent quality welds assure you the highest return on your investment for welding aluminum.

Physical properties
All H-Trode electrodes are cold worked and most items are fully cold formed to ensure the maximum hardness. H-Trode has a high-conductivity of minimum 92% IACS.

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.

Z-Trode® is the ideal cap electrode for resistance welding of light-to-medium gauge coated and uncoated steels and aluminum alloys.

Z-Trode is the electrode of choice for customers looking to reduce spatter in welding. It is the zirconium copper welding electrode cap that outperforms conventional electrodes.

Advantages:

Prevents sticking
Resists mushrooming
Requires less energy
Reduces downtime

Quality Properties

Alloy	C15000 CuZr, EN ISO 5182 A2/4, DIN 17666 Wn 2.1580, RWMA Class I
Chemical composition	Zirconium 0.15% Cu balance
Physical material properties at 20°C	Mass: 8.89g/cm³ Specific heat: 385 J/kg.K Thermal conductivity: 367 W/m.K Expansion coefficient (20-300°C): 16.9 x 10^-6 m/mK Electric conductivity: min. 53 S/m Solution-annealed and hardened: min. 92% 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 [N/mm²]	0.2% Offset yield strength [N/mm²]	Elongation AS [%]	Hardness
Electrodes	≥ 420	≥ 379	≥ 12	≥ 132

Physical Properties

Hardness at ambient temperature:	Minimum 65 HRB
Conductivity:	Minimum 85% IACS

Traceability

All materials are fully traceable. Z-Trode electrodes can be recognized by their flats around the periphery of the electrode cap.

What's the matter with welding spatter?

Luvata's welding expertise is used to determine the exact welding cap electrode, that delivers the optimal weld. Weld spatter occurs during spot welding when small liquid particles are expelled from the surface of the materials being welded together, due to all the pressure and heat. The flying molten metal (spatter) can cause a wide variety of problems that add unnecessary costs and risks.

Watch a video to learn more about why spatter matters.

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All your welding needs for the optimal weld.

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