ما هو البديل الجيد للتدفق؟

Could you elaborate on potential alternatives to flux, especially in the context of soldering or welding applications? I'm aware that flux is a crucial agent for removing oxides and impurities during metal joining, but are there any viable substitutes that offer similar or improved performance? Maybe some natural or synthetic alternatives that are more environmentally friendly? I'm interested in exploring options that could potentially reduce costs, improve efficiency, or simply provide a more sustainable solution. What are the key factors to consider in selecting a suitable substitute for flux?