Pure aluminium melts at 660 C and the alloys somewhat lower, sometimes below 600 C. However, the problem is not really about melting it is softening, which occurs at much lower temperatures. Precipitation hardening alloys soften, rapidly, when heated above 200 C. Thus, as others have also mentioned, the issue becomes what the structure has to do: if it just has to be the right shape and look pretty, worrying about melting might be appropriate but, if it needs to perform as designed, you should only heat it, if you understand exactly what you are doing.
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