If a weapon is able to be infused, it will have an infuse symbol in the upgrade tree.
To actually infuse the weapon, you need weapons of higher damage and legendary marks (3) as well as a few other materials as well (glimmer, motes, weapon/armor parts).
This is useful especially if you find rare weapons that have a higher damage value than legendary weapons yet you'd still rather use the legendary weapon as opposed to the rare.
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Should I level the rare first? The one being sacrificed.
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I wouldn't, I don't believe it does anything beneficial, especially since there are no damage increases in the weapon's perk tree.
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Gracias.
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De nada
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Gracias.