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Joining Processes 

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 Joining is listed in the taxonomy chart as a branch os shaping processes, along with mass-conversing and mass-reducing. Producing final shapes by joining subcomponents may also be referred to as mass-increasing. Both permanent and nonpermanent joints may be used to join subcomponents. In general, permanent joining processes have the following charecteristics:

·         They create permanent joints

·         Mechanical, thermal, or chemical energy is utilized to create joints

·         Filler materials are sometimes necessary to create sound joints

       

Joining is divided into three subfamilies according to the type of energy used: Mechanical, thermal, or chemical. In mechanical joining, high pressures of forces create the joint. In some processes, high pressure is used to plastically deform the surfaces to be joined. This deformation helps remove oxides and expose virgin metal to create a strong joint. The processing temperature of mechanical joining processes is less than workpieces melting points. Thermal joining includes processes that involve localized melting of the material, alowing surfaces to fuse together. Sometimes a filler maretial is used to help create the joint. Thermal joining processes are charecterized by high temperarues. In chemical joining, chemical adhesives create the joint.

 

 (Robert H. Todd,Dell K. Allen,Leo Alting, Fundamental Principles of Manufacturing Processes, p.97 )