How to Post Weld Aging Aluminum Weldments

The heat of welding often acts as an annealing operation, significantly affecting the heat-affected zone of an alloy and decreasing its mechanical strength. If the welded alloy is heat treatable, you can treat it with heat and then age it. This enables it to regain mechanical properties on par with those of the unwelded alloy. Because this procedure requires specialized equipment and a certain degree of expertise, these instructions are intended purely for informational purposes.

Things You'll Need

  • Electric oven
  • Heat resistant gloves
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Instructions

    • 1

      Heat treat the alloy by heating it in an electric oven to 1,000 degrees Fahrenheit and holding the temperature at 1,000 degrees for several minutes. Quench the alloy by immersion in room temperature water. This procedure is intended to dissolve all the alloying additions in solution and hold them there at room temperature.

    • 2

      Age the alloy by treating it for approximately one hour at 400 degrees Fahrenheit. This allows the dissolved additions to precipitate in a controlled manner.

    • 3

      If desired, allow the alloy to undergo a natural aging process by leaving it at room temperature. This aging process will take place over a period of days to weeks, after which the mechanical properties of the alloy will remain stable for decades.

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