NFPA-99 Practice Exam

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What characteristic of the nitrogen used in brazing makes it ideal for purging?

  1. It is dense and heavy

  2. It is reactive and promotes bonding

  3. It is oil-free and dry

  4. It is inexpensive and widely available

The correct answer is: It is oil-free and dry

The characteristic that makes nitrogen ideal for purging during brazing is that it is oil-free and dry. This is crucial because moisture or contaminants in the brazing environment can lead to oxidation and defects in the joint being created. Using dry nitrogen helps to create an inert atmosphere, preventing reactions with oxygen or other gases that could impair the quality of the brazed joint. By ensuring that the nitrogen is free of oil and moisture, it provides an effective purging medium that maintains the integrity of the metals being joined and enhances the overall quality of the brazing process. This is particularly important in applications where strength and reliability are critical.

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