Yes, machining and welding anodized aluminum are possible but require careful consideration and specific techniques due to the properties of the anodized layer. Here's a breakdown:
Machining
Challenges: Cutting tools can be rapidly worn down by the hard oxide layer, necessitating regular replacements or specialized tools. Additionally, machining can harm the anodized finish in the machined area, detracting from its protective and esthetic properties.
Tips: Reduce tool wear and enhance finish quality by using slow cutting speeds, sharp tools, and appropriate lubrication.
Alternative: For improved control and strength, machine the aluminum before anodizing.
Welding
Challenges: If the insulating oxide layer is left in place, it will hinder adequate metal-to-metal contact and result in weak welds. Burning through the layer can also change the properties of the aluminum.
Preparation: Grinding, sanding, or chemical stripping are the necessary methods for removing the anodized layer from the welding area.
Methods: The precision and control of TIG welding make it the preferred method. There are particular uses for laser welding as well.
Alternative: If at all possible, weld the aluminum before anodizing; if not, take into account press-fitting, adhesives, and rivets as alternate joining techniques.
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