Welding is the most common and frequently used method to join the components. The Fusion welding process is the one that is a commonly used method to join 304L stainless steel materials. The Fusion welding process generates much residual stresses within the materials. Residual stresses can be modified by a few techniques like preheating post-weld heat treatment but it takes more time and requires specific tools. Vibratory assisted welding is introduced to reduce welding defects. In th is, a comparative study has been carried between post-weld heat treatment and vibratory assisted welding for the hardness of 304L stainless steel. From the test results, PWHT and vibratory assisted welding are two effective methods to increase the hardness of the weldments. 13% and 18% improvement in the hardness of 304L stainless is observed in the case of PWHT and vibratory assisted welding, respectively, to the conventional welding. Even though both PWHT and VAW as exhibiting almost similar results PWHT processes are more time-consuming, costly, and Laborious. From the current research, it is identified Vibratory assisted welding is the best suitable technique for reducing weld defects and enhancing properties.
An in-process method for controlling welding distortion in Hatch Cover Girders due to fillet welds is developed. It particularly reduces linear and angular distortion by performing FAIRING (triangular heating and triangular cooling) after the weld process. Various heating conditions are examined by experiment and by the lab test analysis (Geographic information system) in order to determine appropriate conditions and to study the mechanism by which welding distortion is reduced. It is consequently found that this mechanism is a result of two main effects: triangular heating effect on one side and triangular cooling effect on other side, which produces the opposite linear and angular distortion.
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