Abstract: A brazing joint, a brazing method, and a device for promoting solder rheology and gas overflow are provided. The brazing joint includes a first base metal, a second base metal, and a brazing seam located therebetween. The brazing seam is formed by filling a solder in a gap formed by welding surfaces of the first and the second base metal and melting it to connect the first and the second base metal. The brazing seam is a concave-shaped brazing seam. The gap defines a first distance and a second distance, the first distance is located at an edge of the gap, the second distance is located at the edge or an inside of the gap, the first distance is greater than the second distance, and a curved surface is formed between the location of the first distance and the location of the second distance for transition.

Abstract: An underwater rescue device, including a cabin provided with a hatch is provided, wherein the hatch is capable to open or close the cabin to form a confined space inside the cabin; a salvage device arranged inside the cabin, comprising a rescue platform and a gripper mechanism arranged on the rescue platform, wherein the rescue platform is movable, the rescue platform is capable to rotate relative to the cabin along at least one rotational axis and is capable to lift and lower to remove the cabin, and the gripper mechanism is configured to grab a drowning person and fix the drowning person on the rescue platform; a cardiopulmonary resuscitation device arranged inside the cabin; a drainage device arranged on the cabin; and a power device arranged on an outer side of the cabin. It has a high degree of automation and can provide immediate rescue for drowning personnel.