A gas-tight joint formed with alloys melting above 1,000ºF is known as what?

A gas-tight joint formed with alloys melting above 1,000ºF is termed a brazed joint. This process typically involves joining metals together by melting and flowing a filler metal into the joint between them. The melting point of the filler metal used in brazing is above 1,000ºF, and it creates a strong, durable bond that is resistant to gas leakage. Brazing differs from welding, where the base metals may melt, and from soldering, which generally employs lower melting point fillers. The result is a joint that is capable of withstanding the high stresses and temperatures often encountered in mechanical systems involving gases.

Utilizing a brazed joint is particularly advantageous in applications requiring enhanced strength and resistance to thermal and mechanical stress, while ensuring that the joint remains gas-tight, which is crucial for the safe transport of gases.