'an improved welding process to reduce welding induced distortion during fabrication of a hydro turbine component involving circumferential grooved fillet welding'

摘要

The present invention relates to an improved welding process to reduce welding induced distortion during fabrication of a hydro turbine component involving circumferential grooved fillet welding, the turbine component constituting a labyrinth consisting of at least one each flange and ring welded together by a circumferential grooved fillet joint, the method comprising the steps of: sequentially depositing weld both in an inner and outer diameter sides of the groove; carrying out back grinding step on the outside diameter side; and determining presence or otherwise of defects on the weld through conducting liquid penetrant test.