JPS5785681A - Diffusion welding method - Google Patents

Abstract

PURPOSE: To prevent the failure of pressurizing bodies owing to differences in thermal expansion and improve the durability of said bodies by separately heating the welding members superposed with the upper and lower pressurizing bodies of a diffusion welding device then pressurizing the same with the pressurizing bodies.

CONSTITUTION: The joining surfaces of the work 1 are finished to prescribed roughness, and cleaned, then these are superposed and are tightly sealed in a retort 2. Next, the retort 2 is installed on a carriage 8, the valve 4 of an air release pipe 5 is connected to an air release device 5, the carriage is moved into a heating furnace 6, a door 7 is closed and heat insulating materials are packed in the clearances between a notch 9 and the pipe 3. The inside of the retort 2 is maintained at a prescribed degree of vaccum, and the work in the retort 2 is heated up to near the welding temp. using a burner 10. On the other hand, electricity is connected to the heaters 14, 16 of upper and lower pressurizing bodies 13, 15 of the diffusion welding device and when the temps. of the bodies 13, 15 rise to near the welding temp., the carriage 8 is drawn out, and retort assemblies 1, 2, 3, 4, are moved onto the body 13, thence an air release device 12 and the valve 4 are connected and the air releasing is started. After the degreee of vacuum and the temp. attain a joining state, the body 15 is screwed down to maintain the pressurizing force, whereby diffusion welding is carried out. The retort assemblies are carried out and are cooled. Hence, no stresses are generated between the work and the pressurizng bodies.

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