When brazing beads, some of the signs that the braze metal is being overheated include the bead spreading out over the metal surface, the flux turning black, and/or a white powdery zinc oxide forming alongside of the braze bead.

Question

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When brazing beads, overheating can cause the bead to spread out too far, turn the flux black, and result in the formation of white powdery zinc oxide.

When Brazing Beads, Some of the Signs That the Braze