Slag, porosity, wear and chipping and other locality defects on the bearing surface of the thrust pad, the defect can be removed and the expected welding parts scrape a new crop, then do a local welding process, when welding, make the old and new welding area alloy fusion , and to take measures to ensure that the non-repaired zone temperature does not exceed 100 ℃, and then press the intact part of the screed board.