CN101704152A - In-situ stress-free resurfacing welding repair process of abrasion of large-sized rotor journal - Google Patents

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

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

Technical field

The invention belongs to the plant equipment service technique, specifically a kind of abrasion of large-sized rotor journal in-situ stress-free resurfacing welding repair process.

Background technology

1. existing rotor journal recovery technique has. and brush coating technology, repair layer are copper, and matter is soft not wear-resisting, and bond strength is low again, comes off easily; 2.. laser melting and coating technique, hot input quantity is big, and the transition region metallographic structure has change, reduces the axle journal mechanical property, forms new bigger hidden danger, and the field repair complex process; 3.. differential of the arc welding technology, efficient is low, and the rotor journal size is big slightly, and repair just is difficult to finish, and the coating quality exists shortcoming such as low-level oxidation, pit are many, fineness difference.

Summary of the invention

In order to overcome the defective of prior art, the object of the present invention is to provide a kind of abrasion of large-sized rotor journal in-situ stress-free resurfacing welding repair process.

The objective of the invention is to be achieved through the following technical solutions:

A kind of abrasion of large-sized rotor journal in-situ stress-free resurfacing welding technology renovation technique, its processing step is:

1., built-up welding preparation: comprise rotor journal fray burr, acute angle etc. are filed finishing shape, and greasy dirt is carried out with chemical solvents such as ethanol, acetone in the rotor journal position of wearing and tearing clean, remove with needle file again and repair position oxide layer and fatigue layer;

2., stress-free resurfacing welding: adopt accurate stress-free resurfacing welding machine that welding wire is not had the temperature rise sloppy heat and repair the position, adopt dislocation, antiposition, dystopy method to carry out different gimmick built-up welding, reserve allowance at rotor journal;

3., thick reconditioning: with lapping device or bastard file the surplus of surfacing part is roughly ground, and then built-up welding eliminates defective, leave the surplus of 0.05mm until overlay cladding;

4., refine mill: with needle file overlay cladding is carried out the surplus of refine to 0.01mm, finish grind to axle journal requirement size with the drawstring device again;

5., polishing: with No. 120, No. 180, No. 240, No. 360 emery cloths, abrasive paper for metallograph rotor journal is repaired position follow procedure polishing respectively.

The beneficial effect of advantage of the present invention and generation is:

Compared with prior art, laser melting and coating technique is too big to the hot input quantity of axle journal, variation has all taken place in the basic material metallographic structure of repairing the position, the mechanical property of axle journal decreases, and the stress-free resurfacing welding technology does not have too much hot input quantity to axle journal, can not cause that basic material metallographic structure and mechanical property change, safe and reliable; It is more that differential of the arc welding technology is repaired surperficial pit, is difficult to eliminate, and fineness can only reach Ra3.2, and adopt stress-free resurfacing welding technology reparation position and matrix not to have undercut, and color and luster is about the same, and fineness reaches Ra0.8, and reparation speed is fast, is three times of differential of the arc weldering.

The present invention adopts the stress-free resurfacing welding technology, no temperature rise with the welding wire sloppy heat at the journal wear position, overlay cladding and rotor matrix are metallurgical binding, the intensity height, hot strength surpasses 985Mpa/cm ², yield strength surpasses 762Mpa/cm ², quality is good; The allowance that built-up welding is reserved, through thick, refine grinding process, eliminate residual stress, technical security is reliable, does not have trouble and worry. and the expense of stress-free resurfacing welding efficient height, reparation duration weak point, cost is low, make the large-sized rotor journal scene of wearing and tearing can obtain repairing, and the axle journal repairing effect is better than other any technology, has shortened inspection speed greatly, reduced because of stopping production and repaired the loss of axle journal, for the operation of generating set long-term safety provides strong assurance.

The specific embodiment

A kind of abrasion of large-sized rotor journal in-situ stress-free resurfacing welding technology renovation technique the steps include:

1., built-up welding preparation: earlier rotor journal fray burr, acute angle are filed finishing shape, and greasy dirt is carried out with chemical solvents such as absolute ethyl alcohol, acetone in the rotor journal position of wearing and tearing clean, remove with needle file again and repair position oxide layer and fatigue layer;

2., stress-free resurfacing welding: adopt RMK-01 stress-free resurfacing welding machine (development of Lanzhou Rui Maike Power Tech Corp. Inc.) that the sloppy heat of steel alloy welding wire is repaired the position at rotor journal, adopt different gimmick built-up welding such as dislocation, antiposition, dystopy, eliminate residual stress; Allowance is reserved in built-up welding;

3., thick reconditioning: with lapping device (development of Lanzhou Rui Maike Power Tech Corp. Inc.) or bastard file surfacing part is roughly ground, the surplus of 0.05mm is arranged until overlay cladding;

4., refine mill: overlay cladding is carried out the surplus of refine to 0.01mm with needle file, repair drawstring device (development of Lanzhou Rui Maike Power Tech Corp. Inc.) with the axle journal of Lanzhou Rui Maike Power Tech Corp. Inc. development again and finish grind, reach the dimensional requirement of rotor journal circularity 0.02mm, tapering 0.02mm;

5., polishing: with No. 120, No. 180, No. 240, No. 360 emery cloths, abrasive paper for metallograph the label of rotor journal reparation position by emery cloth polished respectively, reach the fineness of rotor journal requirement.

Claims (1)

1. abrasion of large-sized rotor journal in-situ stress-free resurfacing welding technology renovation technique, its step comprises:

1., built-up welding preparation: rotor journal fray burr, acute angle etc. are filed finishing shape, again greasy dirt is carried out with chemical solvents such as ethanol, acetone in the rotor journal position of wearing and tearing and clean, the back is removed with needle file and is repaired position oxide layer and fatigue layer again;

2., stress-free resurfacing welding: adopt dislocation, antiposition, the different gimmicks of dystopy, the sloppy heat of welding wire not being had temperature rise with accurate stress-free resurfacing welding machine is reserved built-up welding allowance at the journal wear position;

3., thick reconditioning: with lapping device or bastard file the surplus of surfacing part is roughly ground, left the surplus of 0.05mm until overlay cladding;

4., refine mill: with needle file overlay cladding is carried out the surplus of refine to 0.01mm, finish grind to axle journal requirement size with the drawstring device again;

5., polishing: with No. 120, No. 180, No. 240, No. 360 emery cloths, abrasive paper for metallograph rotor journal is repaired position follow procedure polishing respectively.