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Is the cast iron lower arm better than double-layer stamping?
Cast iron lower swing arm is no better than double-layer stamping.

Because cast iron is pig iron, it is relatively loose, impact-resistant, easy to break by external force, and the welding is not firm after breaking, so the lower arm of cast iron is not as good as double-layer stamping.

Cast iron is to melt iron, pour it into a mold and shape it into a fixed shape.