Car chip keys are usually not welded when they are broken.
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Car keys have chips and circuits inside, if the use of welding repair, may damage the chip or circuit, resulting in normal use.
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If the car chip key is broken, it is recommended to contact the car manufacturer or a professional car key service provider as soon as possible to seek a professional solution. Under normal circumstances, car manufacturers or professional car key service providers can provide replacement chip or key services to ensure that the key can be used normally.
It's not easy to weld, is it? The key is made of brass and needs to be brazed. You might as well go to the garage and make one out of a key. Take your broken key up there and make a copy.