In order to repair the crack of the weld of the expansion joint of the exhaust steam pipe of GPV high pressure cylinder in a nuclear power plant caused by improper heat treatment,a welding seam cutting equipment was developed to cut off the cracked weld seam and process the groove for the next step of automatic welding repair.Firstly,the mechanical design and 3D modeling of the welding seam cutting equipment were carried out using SolidWorks.The driving motor was selected and calculated,and the structure of control system was designed.Then,a prototype of the equipment and a simulation body of the expansion joint guide tube were made.Finally,continuous cutting tests were conducted on the performance of the equipment prototype in the laboratory using the simulation body,verifying that the equipment can efficiently complete the cutting and groove processing of the expansion joint guide tube,and the groove processing quality is excellent,with stable device performance.
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