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of FSW by StirWeld


FSW Applications

Do you know how electric battery casings are assemblied? Which technology allows major savings in aeronautics by replacing riveting? What is it now possible to weld casted aluminum and dissimilar material?
The FSW is used today in aeronautics, automotive, space, rail and navy (welding standard: ISO 25239).

FSW results in :

Cost reduction
Manufacturing of cheaper and lighter products
Innovation in multi-material assembly
Diversification of your process offer at a lower cost
Solution to the lack of qualified welders
FSW semi-curcular weld by Stirweld

FSW allows the assembly of aluminum profiles for rigid panel manufacturing

Why use FSW to assembly aluminium profiles to form rigid panels?


  • Thinner and wider panels : aluminium profiles are generally smaller than 400-mm wide, FSW overcomes this limits by butt welding.
  • One manufacturing step : no part preparation, no degreasing, no machining after welding
  • Lighter and more rigid panels : profile optimization associated to FSW limits the useless shapes.
  • Quality : the weld is perfectly sealed and the mechanical strengths are close to those of the base material.
  • Maturity : this technology is already used in automotive (battery casing), rail (car blank), aeronautics and naval (floor).
FSW Stirweld trancparence welding

The two FSW welds located in the center of each of two profiles are lap welds.

FSW in Europe butt welding

The FSW weld in the center of the part is a butt weld.

Heat sinks

Stirweld FSW video of  heat sink


Bâtiment ENS, Campus de Ker lann, Avenue Robert Schuman, 35170 Bruz FRANCE

An active heak sink is an aluminium component in which a fluid circulates cooling electronic components.

Conventional assembly technologies (screwing, brazing or FE welding) can lead to problems of quality (leakage, mechanical resistance), design (complex geometries are not possible) and manufacturing (time-consuming set-up).

  • The solution :

FSW performs perfectly sealed welds and resistant to high pressures. Moreover, FSW is very easy to implement, even for small batches and complex geometries.

  • Examples of application sectors : aeronautics, railway, wind turbine, military


Cold plate FSW

Heat sink kit before welding

French Company Stirweld welds cold plates FSW

Heat sink cross section after friction stir welding

Stirweld assembled cold plate with FSW

Heat sink assembly view from above

Too many welding defects?

Reduction of raw material

Many mechanical parts are machined from a massive block of aluminium where up to 90% of material is removed. Many companies would like to reduce their cost of raw material and their machining time.

  • The solution: part welding by FSW in order to get a preform as close as possible to the final shape.
  • Examples of application sectors : aeronautics, military, nuclear, space.
Frame made with aluminum profiles

Frame made with aluminum profiles and FSW .

FSW France frame weld

Detail of a frame corner weld (before final machining to eliminate entry and exit taps)

Welding of casted parts

Aluminium casted parts are difficult or not weldable with conventional processes (degassing of casted aluminium).

The solution :

  • FSW allows the welding of aluminium castings, even die casted pieces, due to the solid state.

  Examples of application sectors :

  • Electronic box : the gains in mass are optimized without altering the mechanical characteristics.
  • Alloy wheels, battery boxes and heat exchangers are soldered by FSW


Stirweld welds coolings fins

The cooling fins are welded to an electronic box.

FSW welds French start up

Two FSW welds provide thermal conductivity.

Replacement of traditional assemblies

(riveting, MIG, bonding)

The most resistant aluminum alloys are not weldable with conventional technologies because of their chemical composition (2000 and 7000 series). These alloys are currently assembled by screwing, sticking or riveting.

Many companies would like to replace these processes to reduce manufacturing costs while increasing the mechanical strength of assemblies.

The solution : FSW results in fast and high strenght assembly of all aluminum alloys.

Examples of application sectors : aerospace, civil engineering (bridges). FSW is one of the most significant advances in manufacturing of NASA Space shuttle tanks, as well as in Ariane and Space X rockets.

Replacement riveting by FSW

Replacement riveting by FSW welding for the mixed application 2024-T3 and 7075-T6

Replacement of spot welding

Conventional resistance welding requires a finishing operation for ornamental applications. This operation is time-consuming and tedious requiring qualified operators.

 The solution : FSW by lap welding results in no-affected back side and eliminates grinding.

Examples of application sectors : sheet jobshop, aeronautics.

Stirweld Replacement of resistance welding with FSW

Replacement of resistance welding with FSW spot welding.

Welding of copper components

FSW replaces resistance welding or brazing by improving the junction quality, by reducing the manufacturing cost (no electrode wear) and by increasing the mechanical resistance.

Exemple of application sector : energy.

FSW spot welding

FSW spot welding of a tinned copper connector on a copper cable.

Replacement of copper by aluminium (welding Cu / Al)

FSW allows a metallurgical junction between copper and aluminium limiting electrical resistivity.

Example of application sector : energy.

Stirweld FSW welds copper and alu

FSW copper welding on aluminum.

I would like to test FSW

for my application