Measurement of Residual Stress in a Weld Bead

Component welding is practiced in the manufacturing of various products in the industrial scale. During this process, some of the welded material gets deposited along the welding pass which causes stress concentration. A combination of residual stress and external loads tends to produce weld deformation which increases the stress concentration when the operating load is applied. This affects the quality of the components and their service life. Therefore, for measuring the residual stress in the weld beads, frictional strain gauges are employed.

The problem with using the conventional strain gauge, in this case, is that it cannot function well in conditions such as high temperatures and magnetic noise. The FGMH-2A strain checker from TML is especially designed for such applications where measurement is to be done on a small area such as the vicinity of a welded part. The transducer is easily attached and detached from the measurement object by the operation of a magnet lever. Furthermore, the direction of the strain can be adjusted with the help of the lever of the frictional strain gauge. Also, for getting strain measurements in three directions simultaneously, the FGMH-3A strain checker is used.