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Which joining method is used for aluminium body structures?

  • A.Self piercing rivets combined with structural adhesive
  • B.Resistance spot welding, exactly as for steel, since the two materials respond similarly to the welding process
  • C.Brazing
  • D.Mechanical fasteners alone, since adhesives are unable to develop sufficient strength on an aluminium surface

Answer: A

Aluminium is difficult to spot weld because of its oxide layer and high thermal conductivity, so self piercing rivets and structural adhesive are used instead, often in combination. The adhesive also seals the joint against corrosion. Repair requires specialist equipment and a separate clean area to avoid contaminating aluminium with steel particles.

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