vibration welding does have its drawbacks, however. the process does not lend itself well to low modulus thermoplastics or to joints between plastics with relatively high differences in melting temperatures. vibration welding requires part specific fixturing and joint designs, and the part will be exposed to rigorous vibration during the welding cycle which may damage sensitive or miniature components. the finished weld will be surrounded by a significant amount of flash, which must be removed if appearance is an issue. alternatively, joint geometries which hide the excess flash can be used. lastly, the process is not well suited to welding of anything other than relatively flat joints.