In-situ stress-free resurfacing welding repair process of abrasion of large-sized rotor journal

Abstract

The invention relates to an in-situ stress-free resurfacing welding repair process of the abrasion of a large-sized rotor journal. The process comprises the following steps of: (1), carrying out the preparation work of resurfacing welding, filing and shaping burrs, acute angles and the like at the abraded positions of the large-sized rotor journal, cleaning oil spots and rusty scales chemically, then removing repaired positions and covering fatigue layers; (2), carrying out stress-free resurfacing welding, melting a welding wire coldly by adopting a stress-free resurfacing welding machine, carrying out resurfacing welding without temperature rise on the abraded positions of the journal and remaining a processing redundancy; (3), carrying out rough grinding, then carrying out resurfacing welding on defects after rough grinding and afterwards carrying out polishing and fine grinding; and (4), finally, polishing to reach the required size of the rotor journal. The invention adopts a stress-free resurfacing welding technique, has high strength, good quality, high efficiency, short construction period and low cost, enables the in-situ high-quality repair of the abrasion of the large-sized rotor journal to become actual and provides powerful guarantee for the long-term safe running of a generator set; and a resurfacing welding layer and a rotor basal body are in metallurgical bonding.

Description

technical field [0001] The invention belongs to the repair technology of mechanical equipment, in particular to a non-stress surfacing welding repair process on the site of large-scale rotor journal wear. Background technique [0002] The existing rotor journal repair technologies include ①. electric brush plating technology, the repair layer is copper, which is soft and not wear-resistant, has low bonding strength, and is easy to fall off; ②. laser cladding technology, with large heat input and gold in the transition zone. The phase structure changes, reducing the mechanical properties of the journal, forming new and greater hidden dangers, and the on-site repair process is complicated; ③. Micro-arc welding technology, low efficiency, slightly larger rotor journal size, difficult to complete the repair work, and the cladding The quality has shortcomings such as micro-oxidation, many pitting spots, and poor finish. Contents of the invention [0003] In order to overcome t...

AI Technical Summary

Problems solved by technology

[0002] The existing rotor journal repair technologies include ①. electric brush plating technology, the repair layer is copper, which is soft and not wear-resistant, has low bonding strength, and is easy to fall off; ②. laser cladding technology, with large heat input and gold in the transition zone. The phase structure changes, reducing the mechanical properties of the journal, forming new and greater hidden dangers, and the on-site repair process is complicated; ③. Micro-arc welding technology, low efficiency, slightly larger rotor journal size, difficult to complete the repair work, and the cladding The quality has shortcomings such as micro-oxidation, many pitting spots, and poor finish