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Should the brazing working environment be greater than five square meters?

According to official website, a personal library, the brazing working environment should be greater than or equal to five square meters. Brazing refers to a welding method in which the solder below the melting point of the weldment and the weldment are heated to the melting temperature of the solder at the same time, and the gap of the solid workpiece is filled with liquid solder to connect the metals.