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4043 Aluminum Silicon alloy is very commonly used for welding on 6XXX base materials and other heat-treatable alloys. 4043 is a soft alloy with good crack resistance and high penetration compared to other filler metals. It can be used for certain brazing applications and to weld on high-silicon casts like A356. Welding of 5XXX with 4043 and other 4XXX filler metals should be avoided.
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