ACB

Linear Friction Welding

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LFW process

  • Good metallurgical structure (no melting)image_process_lgende_gb
  • Fast process (20 - 30 seconds) with small Thermal Affected Zone
  • Low deformation after welding
  • Possibility of joining parts of different or/and complex sections
  • Less material losses compared to flash welding
  • Possibility of joining different materials
  • Repeatable process, easy to automate
  • Less fumes and spatters
  • In some case, no need of protective gas

Tonnage is from 5T to 100T

Application for Blisks (blades + disk) manufacturing

In aero engines, blades are generally fixed mechanically on the disk. Rotors can also be machined from solid blocks in order to avoid the mechanical assembly.
The LFW process for blisks manufacturing allows a great mass saving with regard to mechanically assembled rotors, and a great raw material saving with regard to solid machined rotors. Another advantage is the ability to weld dissimilar materials.

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Application for aerostructure

The « Buy to Fly » represents the ratio in volume of the raw material bought to make part and the actual flying part. The buy to fly ratio is significantly improved by the use of LFW.

 

Main application in aerostructure:

Ti64 α-β or meta-stable β

  • Thick joints (5mm+)‏
  • Welds
  • Butt welds
  • Rib welds
  • Angle welds
  • Keystone welds

 

Joining of gussets / strengtheners

  • Thick sheets
  • Straight channels
  • Incurved channels (HSF)
  • Reconstruction
  • Channels from sheets
  • Complex parts from sheet

LFW process LFW process