| 摘要 |
PURPOSE:To allow a brazing filler metal to smoothly penetrate into the joint part of materials to be joined and to improve the strength of the joint parts by forming the joint holes of the materials to be joined to a circular shape and deforming the joint parts of copper pipes to a sectional shape different from the circular shape. CONSTITUTION:The copper pipes 2 are respectively fitted into the joint holes of both joint hole parts 4 of suction cups 1A and 1B and silver solders attached to both brazing joint parts 5 is melted by heating in an oxygen-free furnace to execute brazing. The copper solder attached to the brazing joint part 5 of the suction cups 1A, 1B is melt at the same instant to weld both suction cups. The joint part 2' of the copper pipe 2 is preliminarily deformed to the elliptical shape different from the circular shape. The major axis part contacts the hole 3 and has a space in the part except the major axis part when the joint part 2' of the pipe 2 is fitted into the hole 3 of the joint hole part 4 and therefore the molten silver solder flows smoothly over the entire periphery in the joint part 2' of the pipe 2. The brazing welding is thus efficiently executed. |
