Oerlikon Alurod AlSi12 description: ALUROD AlSi12 is a 4047 type aluminum solid TlG welding rod depositing Al-12Si weld metal. Suitable for use with Ar, or Ar+He mixed shielding gases. ALUROD AlSi12 is used for welding of aluminium-silicon alloys with a silicon content higher than 7%. Suitable for long term high temperature applications. The higher Si-content results in higher fluidity and lower shrinkage in the weld. The hot cracking sensitivity also low and the weld deposit surface is bright.