Aluminum

MASTERING WELDING CHALLENGES WITH ALUMINUM ALLOYS : SOLUTIONS AND BEST PRACTICES

Whether they are wrought or foundry alloys, aluminum alloys all share a common characteristic : the presence of a refractory oxide layer called alumina. This characteristic makes welding impossible without prior pickling (chemical, electronic, or mechanical) of this oxide.

Inherent problems when welding aluminum and its alloys includes :

  • Porosities (due to undissolved hydrogen from the base metal, protective gases, or even the electrode's coating).
  • Hot cracking (related to the type of base metal welded).
  • Reduction of the joint resistance (emphasizing the importance of selecting the right filler metal). 
The choice of the filler metal is crucial because it will influence various factors such as fluidity, sensitivity to hot cracking, mechanical resistance, joint ductility, corrosion resistance, maintaining service temperature, or even the aesthetic aspect of the joint. 

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