Cast steel stator pressing ring repair welding process

Abstract

The invention relates to an economic and effective repair welding process for finding defects of a cast steel stator pressing ring. The repair welding process sequentially comprises the following steps that: (1) the defect checking on the rough processing surface of the cast steel stator pressing ring is carried out, and marks are made in defect positions; (2) the defects are dug and removed according to the positions and the depths of the defects; (3) the repair welding is carried out; (4) the cast steel pressing ring is processed to the size according to part draws; (5) the cast steel stator pressing ring is assembled and welded into a stator machine seat; and (6) the stator machine seat is mechanically processed to the final size. In the defect checking on the rough processing surface of the cast steel stator pressing ring, firstly, a 4MHz phase array inclined probe is used for finding the defects, in addition, marks are made in the defect positions, then, a 5MHz phase array probe with a distance being 2mm near the field region is used for scanning near the defect positions, the defect depth is precisely positioned, and cracks and other defects are distinguished. The cast steel stator pressing ring repair welding process provided by the invention has the advantages that the defect finding, positioning and determination accuracies are high, the repair welding workload is small, the process route is short, and the repair cost is low.

Description

technical field [0001] The invention relates to a defect detection and economical and effective welding repair process for a cast steel stator pressure ring. Background technique [0002] The frames of high-power traction motors with a stand-alone capacity of more than 500kW used by high-power railway trains and locomotives in foreign countries generally adopt a welded structure of cast steel pressure rings on both sides and middle steel plates. The iron core is formed in the seat, which is called the stator frame. The stator pressure ring is an important part of this type of traction motor. It must be connected with the gearbox to output torque, and must also bear its own weight and various dynamic loads generated during the operation of the locomotive through the suspension bolts on the bogie. Since it is impossible to cure the casting defects of the stator pressure ring castings, some casting defects on the product must be solved by welding. At present, the main process...

AI Technical Summary

Problems solved by technology

Since ordinary straight probes are used to detect defects on the rough machined surface of the cast steel stator pressure ring, the common straight probes have a large blind area near the surface during detection, that is, the superficial defects within 10mm of the detection surface cannot be found, and the defects below 10mm cannot be found. The reliability of probability, positioning and qualitative is poor, and some defects are only discovered in the stator frame processing process, which not only wastes a lot of repair time and machining center man-hours, sometimes even scraps the entire stator frame

Images