Air Suspension System Welded joints in a welded structure are expected to possess certain service-related capabilities. Welded joints are generally required to carry loading of various types in which the weld is subjected to stress of either a simple or complex character. More over a finished weld is not always as good or as bad as it may appear to be on its surface. It is therefore necessary to find out how satisfactory or sound the weld is. For this purpose certain weld inspection and testing procedures have been discovered and standardized to estimate the expected performance of the welded structures. The examination and test applied to welded joints range from relatively simple ones such as visual inspection of the surface of the weld which provides some information on the quality of the workmanship and presence or absence of surface defects to the more elaborate procedures carried out for the purpose of obtaining some knowledge of the behavior of the welded joint under operating conditions.