Spot welding connectors

SpotFix connect: Connector for the secondary circuit of resistance welding devices

Careful attention must be given to the cable connection points in the secondary circuit of resistance welding equipment. Bolted cable connection points tend to deteriorate over time, leading to increased contact resistance and energy losses. When worn secondary circuit components, such as connecting cables, need to be replaced, extensive machining of the old cable connection points is necessary. This re-work process is time-consuming, and its quality depends on the expertise of the technician. Insufficient machining can result in undefined contact resistances, higher energy losses, and a shortened service life.

To address these challenges, the modular and scalable SpotFix connect system was specifically developed for use in the secondary circuit of resistance welding equipment, particularly X-guns. This cooled connector system eliminates the drawbacks of screw connections. It ensures consistently reliable contact conditions and optimal system availability.

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Round transformer connection for maximum space saving
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TCR

Round transformer connection for maximum space saving

Gun arm connection
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GAC

Gun arm connection

Transformer connection with a 25° angled cable connection
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TC25

Transformer connection with a 25° angled cable connection

Straight transformer connection with 0° cable routing
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TC0

Straight transformer connection with 0° cable routing

Connection cable with a 600 mm² cross-section. As an option also 2 x 400 mm² possible.
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CC600

Connection cable with a 600 mm² cross-section. As an option also 2 x 400 mm² possible.

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Connection to the primary circuit

Stäubli also offers pluggable solutions for the primary circuit of spot welding guns since 1990, both in round and flat shape with WeldFix and RobiFix connectors.

WeldFix and RobiFix

SpotFix connect

Connector for the secondary circuit of resistance welding devices

  • pluggable connection solutions
  • unique MULTILAM contact technology
  • consistently reliable contact conditions
Benefits

Thanks to Stäubli's reliable MULTILAM contact technology, it is now possible to implement pluggable high-current applications while maintaining consistently low contact resistances. This enables quick and safe replacement of cables in a resistance welding machine without requiring special training.

Stäubli's expertise positions us as a first mover in offering a pluggable connection concept for resistance welding equipment, aiming to minimize downtimes and reduce the total cost of ownership. This innovative approach not only provides solutions for traditional setups, but also opens up new possibilities for design methods and applications.

Applications
  • Resistance welding guns
  • One transformer supplying several machines
  • Manually pluggable fixtures
  • Automated pluggable fixtures in welding lines
  • Power supply in welding tools
Technical Specifications

SpotFix

 

Pin/Socket diameter

32 mm

Cable cross section

600 mm²
special solution 2 x 400 mm²

Total contact resistance 
(Transformer connector to gunarm connector)

< 30 µΩ

Rated voltage

AC 25 V / DC 60 V

Rated current max. 

6.5 kA

Temperature equilibrium with 250 mm cable

70 °C at IRMS = 4 kA (6 l/min, Τamb = 20 °C)

Ambient temperature 

Max. 40 °C

Cooling concept 

Water cooling in connector (dry coupling)

Contact material 

Cu, silver plated

No wetting-disturbing substances Silicone-free
Transformer connector MF100 according to customer standard, others possible

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