you need a specieal type of welder. aluminum has a much lower melting point then iron or steel. You can try to soder it with lead free soder but i am not sure how well it will hold.
welding aluminum rims is not recommended. the welded area will never be as strong as it was before the crack or break. when you weld the area affected. the metal around it is effectively annealed making it softer than it originally was before welding. most places will not weld a rim for the simple reason of liability. soldering or home repairs are asking for trouble. you have to ask yourself. what costs more. a new rim, your wrecked car after the repair fails or your life if it causes a major accident.
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