| 摘要 |
A process, termed Trailing Edge Stress Relief (TESR) is described which can be used to produce a weld joint with reduced residual stress level with least defects. In this process, cyclic stresses are applied to the trailing edge of the weld (TEW) during welding. Welding operation is always in quasi-stationary state; but in the TEW microstructure is in formative stages. Therefore TEW is in the Second order Quasi Stationary (SQS) state. During the time solidification of the cup of molten metal takes place, in TESR process cyclic stress is applied that modifies the structure of microstructure. The modification of the structure of microstructure reduces the grain size and the potential energy that is otherwise retained after solidification in it, as residual stress. In the process described pneumatic vibrators are used; but such cyclic stresses can be generated by other devices using electrical, electronic, magnetic or ultrasonic energy; and systems can be designed using combinations thereof. Further such a system can be an integral part of a welding operation making it a versatile process. Further when sufficient data on parameters is collected, it will be possible to design the residual stress level in a weld.
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