Which of the following statements is true about tubing connections?

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In tubing connections for mechanical and marine piping, the priority is to create leak-tight joints that can withstand vibration and pressure without distorting the tube. Brazing, flaring, and compression fittings are designed specifically for metal tubes and provide reliable joints without excessive heat input into the tube itself. Brazing uses a filler metal that melts at a lower temperature than the tube, forming a strong bond. Flaring works by shaping the tube end into a flare that mates with a nut and ferrule, creating a tight seal. Compression fittings achieve a seal by tightening a nut to squeeze a ferrule against the tube, firmly gripping it and preventing leaks.

Soldering, while common in some low-pressure or small-diameter copper systems, generally lacks the strength and leak resistance required for many hydraulic or fuel lines found in marine engineering, especially under vibration and higher pressures. Welding, although useful for joining longer pipe runs or fabricating assemblies, is not the typical method for standard tube-to-fitting connections because it can distort the tubing and make future disassembly or inspection more difficult. Adhesive bonding is not suitable for metal fluid systems where strength, temperature, and chemical compatibility are critical.

So the statement that brazing, flaring and compression are common methods best captures how tubing connections are typically joined.