I think you are possibly referring to aluminium alloy? Composite would typically be a plastic. Apologies if English is not your first language, but the quality of replies may be better if we talk about welding alloy.
The exact alloy is going to vary with the model of bike. The odd Enfield may still be cast iron. What are you trying to Weld onto which sort of bike? MIG set up for aluminium will do most, but beyond that I'll wait for a more expert welder to comment.
Andy
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