Icon

Contact

Icon

Do you have questions about the content shown and would like to learn more? 
Contact us now.

SWOPtec
Resistance element welding for aluminum and steel

Lightweight metals, such as aluminum, play an important role in weight reduction. But because of the vastly different melting points and the different heat expansion coefficients, joining aluminum to steel by welding presents a challenge. The SWOPtec and Flexweld® resistance element welding processes make it possible to join dissimilar metal combinations such as aluminum and steel.

 

Cutting 
costs

Multi-material 
connector

Reducing 
weight

The SWOPtec element is pressed-in into the non pre-holed aluminum part. Here the element is locked by filling the element shaft groove with aluminum. This prevents the element from falling out as the parts are moved on to the welding line.

SWOPtec
Resistance element welding for aluminum and steel

The market’s demands

  • Car bodies with a higher proportion of aluminum components (e.g., Al die-cast)
  • Flexible and reliable joining solutions for mixed material combinations
  • Cost-efficient manufacturing processes
  • Global availability of expertise, technology and service

ARNOLD provides the solution

SWOPtec
A solution that uses existing system technology

Technical advantages of SWOPtec

  • Multi-layer connections made of aluminum and high-strength steel
  • Can be integrated into existing welding and assembly lines 
  • Requires only a small amount of further qualification for factory personnel 
  • Is available as a complete system including the flexible feeder and press-in processing technology
  • Very good strength performance

Commercial advantages of SWOPtec

  • Generates considerable weight saving 
  • Efficient solution saves additional costs 
  • Can be implemented in press shop or body-in-white application
  • Joining technology for increasing car model variety

SWOPtec
Applications

SWOPtec is suitable for joining any components where a steel-aluminum connection is required. 

Blue marked parts either in running application or in benchmarking/qualification phase.


SWOPtec
The geometry of the fastener element

  • 12 mm at the head and 10.5 mm shank diameter. 
  • Covers aluminum sheet applications in thickness range of 1.1 mm to 4.5 mm.

SWOPtec fastener elements are made from easily weldable 20MnB4 manganese boron steel. The coating on the elements can be adapted to suit the customer’s needs. The standard coating on the element is electro-galvanized zinc with a minimum thickness of 8 µm. The elements are not heat-treated (tempered) as standard.

SWOPtec
The joining process in two steps

Step 1 

Press the SWOPtec element into the aluminum component

Elements cannot fall out due to the interlock in the aluminum in the element groove

Step 2 

Resistance spot welding on the aluminum and steel components

Metallographic micro-section of a welded SWOPtec joint

Everything you need.

Application-related and near-series testing
 

Find out more

Calculations and simulations for technical evaluation and optimization 

Find out more

  • Brochure Flexweld® and SWOPtec

    Resistance element welding
    PDF –
    2 MB
  • Download
  • InfosheetSWOPtec

    Resistance element welding
    PDF –
    406 KB
  • Download

You may also be interested in

The self-clinching screw for delicate work

Rivtex® Screw

Go to product

Self-punching ARNOLD clinch nuts up to 4 mm

PIAS®

Go to product

The extra powerful self-clinch screw

Strux®

Go to product

Ask for a personal consultation from our experts.