From GAWDAwiki
Diffusion welding is a solid state welding process that takes place below the melting temperatures of both metals. Bonding is a result of diffusion of the interfacing atoms. See also: Cold welding.[1]
Advantages of Diffusion Welding
- Welds having essentially the same physical, chemical and mechanical properties as the base metal can be produced.
- Heat treating operations can be incorporated during the bonding cycle.
- Continuous, leak tight welds can be formed.
- The process is well suited for welding dissimilar metals and ceramics.
- Numerous welds can be made simultaneously.
- Weldability is largely independent of material thickness.
Disadvantages and Limitations of Diffusion Welding
- A major difficulty is the removal of oxide and the contaminating layers practically all metals are exposed to natural or industrial environment.
- Opposing surfaces must be mated in size to within a few angstroms of each other in order to achieve a satisfactory metal bond.
- Diffusion welding requires a relatively long, time consuming thermal cycle.
- With dissimilar materials, difficulties due to time/temperature/pressure requirements are frequently encountered.
- Diffusion welding is not classified as a mass production process.
Common Applications of Diffusion Welding
- Fabrication of reactor components in atomic energy industries.
- Fabrication of honeycomb, rocket engines, helicopter rotor hub, turbine components, etc, in aerospace missile and rocketry industries.
- Fabrication of composite materials.[2]
References
- http://www.substech.com/dokuwiki/doku.php?id=solid_state_welding_ssw#cold_welding_cw
- Welding Technology Machines Info
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