Friction Stir Scribe Technology

Friction Stir Scribe Technology

DConT2

 

Laboratory: Pacific Northwest National Laboratory (PNNL)

Technology: Friction Stir Scribe Technology

Summary: Solid-state joining processes like friction stir welding enable thewelding of many materials otherwise considered unweldable. While friction-based approaches have been demonstrated to produce joints between dissimilar metals, the metallurgical immiscibility of certain combinations greatly complicates the joining of very dissimilar materials due to drastic variations in the melting temperature of each component. Developed by researchers at PNNL, the friction stir scribe technology process overcomes the issues created by chemical incompatibility and melting temperature variations between dissimilar material combinations. This process enables the joining of dissimilar materials in a lap configuration where the materials are bonded both chemically and mechanically simultaneously to both enable joining and enhance weld properties.

The process combines localized, controlled extrusion of the lower melting temperature material with focused machining of the higher melting temperature material at the interface of the two materials. This combined action works to create a mechanically interlocked joint at a temperature below the melting point of the lower melting temperature material; thus, maintaining the solid-state nature of the process and eliminating the complications with chemical incompatibility caused by traditional melt-solidification weld processes. This enables the welding of very different metals, but also allows the welding of different material,s such as polymers, to metals or composites.

Advantages:

  • Overcomes the issues created by chemical incompatibility and melting temperature variations between dissimilar material combinations.
  • Generates a lap weld that binds the dissimilar materials both chemically and mechanically to achieve enhanced joint strength.
  • Allows the welding of very different metals and materials, such as polymers, to metals or composites.
  • Lap welds strength is enhanced by filled interlocking features.

Potential Industry Applications:

  • Aerospace & defense
  • Automotive & transportation
  • Manufacturing & warehousing
  • Oil & gas

Opportunity: Available for licensing in all fields.

Contact: Dave L. Greenslade

View the full listing at PNNL Available Technologies.

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