Tubing expansion tools and systems and methods for leak detection

A working element operable to expand an end of a tube, the working element comprising:

• a drive shaft;
• a main body coupled for co-rotation with the drive shaft;
• a plurality of arms movably coupled to the main body, the arms configured to move from a retracted position toward an expanded position due to inertia in response to rotation of the drive shaft and the main body;
• and
• a plurality of rollers supported by the arms,
• wherein the plurality of rollers is engageable with an inner circumference of the tube to expand the end of the tube via centrifugal force as the arms move toward the expanded position.

A working element operable to expand an end of a tube, the working element comprising:

• a main body;
• a first support and a second support movably coupled to the main body for movement between a retracted position and an expanded position;
• a mandrel engageable with the first support and the second support to move the first support and the second support toward the expanded position;
• a first roller coupled to the first support;
• and
• a second roller coupled to the second support,
• wherein the first roller and the second roller are configured to be inserted into the end of the tube when the first and second supports are in the retracted position,
• wherein the first support and the second support are movable to the expanded position in response to translation of the mandrel while the first roller and the second roller are inserted into the end of the tube to engage the first roller and the second roller with an inner circumference of the tube, and
• wherein the mandrel is coupled for co-rotation with the main body, and
• wherein the mandrel and the main body are configured to rotate when the first roller and the second roller are engaged with the inner circumference of the tube to expand the end of the tube,
• wherein the main body includes a non-circular opening, and wherein the mandrel extends through the non-circular opening to couple the mandrel and the main body for co-rotation.