When purging the lines with nitrogen during brazing, what should the nitrogen pressure regulator be set at?

Setting the nitrogen pressure regulator between 1 to 2 psig is ideal for purging lines during brazing. This pressure range ensures that there is a sufficient flow of nitrogen to displace any moisture or oxidizing agents from the system without introducing too much pressure that could lead to leaks or damage to the components being brazed. Proper purging is crucial to maintain the integrity of the brazing process, as it helps create an oxygen-free environment that enables better bonding and reduces the likelihood of defects in the weld joints.

Choosing a pressure that is too low may not effectively purge the lines, while too high a pressure can lead to unwanted stress on the system or even hazardous situations. The recommended range, therefore, balances safety and effectiveness for optimal brazing outcomes.