CN101003104A - Built up welding technique of restoring roller for shape bar - Google Patents
Built up welding technique of restoring roller for shape bar Download PDFInfo
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- CN101003104A CN101003104A CN 200610021925 CN200610021925A CN101003104A CN 101003104 A CN101003104 A CN 101003104A CN 200610021925 CN200610021925 CN 200610021925 CN 200610021925 A CN200610021925 A CN 200610021925A CN 101003104 A CN101003104 A CN 101003104A
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Abstract
A build-up welding technology for repairing the rolling roller of section includes such steps as pre-turning, defect inspection, pre-heating, welding transition layer with flux-cored wire SN-YD1031 and flux SSF, welding working layer with flux-cored wire SN-YD285 and flux HJ107, heat treating, turning, and inspection.
Description
Technical field
The invention belongs to the technique for overlaying field, relate to the omnipotent production line second rolling mill roll overlaying reparation of a kind of Metallurgical Enterprise, particularly a kind of section roll build-up welding repair process.
Background technology
Roll is the crucial spare part that Metallurgical Enterprise is produced, climbing the omnipotent production line second rolling mill roll of steel (being commonly called as the BD2 roll) material is 60CrNiMo, barrel diameter has φ 1090 according to steel rolling product type difference, φ 1320, φ 1340, specifications such as φ 1350, can rolling 75Kg/m, 60Kg/m, 50Kg/m, 43Kg/m heavy rail and 300*175H, 200*200H, 250*250H, section bars such as 300*200H shaped steel, the body of roll bears huge high speed alternation draught pressure during work, square steel is through being shaped substantially behind this milling train, drafts is big when rolling, the pass wearing and tearing are big, require at high temperature to have certain red hardness, wearability, fatigue resistance.The production of BD2 roll need be through manufacturing procedures such as steel-making, forging and pressing, normalizings, and the production cycle is long, and disposable occupied fund volume is big, the manufacturing cost costliness, a pair of this roll is worth about 1,500,000 yuan, if do not do repair process after the normal abandonment, will cause enormous economic loss to smelter.As the normal abandonment roll is carried out the built-up welding reparation, solved long, problems such as lack service life, wear no resistance, production cost height of this roll production cycle well, realized the utilization again of the residual body of useless roller simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is to provide the build-up welding repair process of a kind of Metallurgical Enterprise second roll of omnipotent production line (BD2).
Its technical scheme is, described build-up welding repair process steps in sequence is rough turn before the roll weldering, carrying out flaw detection, and preheating, the built-up welding transition zone, the built-up welding working lining, post weld heat treatment, surperficial turning processing, carrying out flaw detection is carried out intermediate heat-treatment in built-up welding working lining process.Adopt this technology can be, reduce the Metallurgical Enterprise production cost the BD2 roll repairing and reusing of normal abandonment, adopt BD2 roll after the reparation of this technology be service life former new roller 1-2 doubly.
The specific embodiment
Processing step sequencing of the present invention is rough turn before the roll weldering, carrying out flaw detection, preheating, built-up welding transition zone, built-up welding working lining, post weld heat treatment, roll finished product turning processing, carrying out flaw detection.
In built-up welding working lining process, carry out intermediate heat-treatment respectively.
1, rough turn before the roll weldering
Rough turn purpose is to remove roller surface fatigue layer and blemish before the weldering, the minimum 3mm that is not less than of the turning degree of depth, concrete visual fatigue layer thickness and decide requires fatigue layer is thoroughly removed totally, the respective surface defective can be carried out local turning or polishing, and purpose is that defective is removed totally.
2, carrying out flaw detection
Must carry out flaw detection after roll is rough turn, adopt magnetic powder inspection and ultrasonic examination to check that roll barrel surface or inside have or not the crack defect that exceeds standard, exist the roll of crack defect not do reparation to body of roll inside, carry out local turning or polishing to what there was defective in body surface, but reparation is not done less than what roll used the diameter lower limit in the roller footpath after the turning.
3, preheating
The BD2 roll that flaw detection is qualified is packed into and is carried out weld preheating in the special-purpose thermal insulation cover and handle, and programming rate is 20-40 ℃/h, and preheat temperature is 350 ℃ ± 10 ℃, and constant temperature cools the temperature to 280-320 ℃ of beginning built-up welding transition zone after 16 hours.
4, built-up welding transition zone
Transition zone built-up welding one deck all adopts the built-up welding of transition zone technology smooth to body of roll local defect position.Transition zone bead-welding technology parameter is as follows:
Resurfacing welding material: SN-YD1031 (Ф 4.0mm) flux-cored wire+SSF solder flux;
Electric power polarity: dc reverse connection;
Welding current: 380-420A;
Weldingvoltage: 29-32V;
Speed of welding: 400-420mm/min;
Stem elongation: 25-30mm; Eccentric throw: 30-40mm;
Amount of lap: 50-60%; Interlayer temperature: 280-320 ℃;
5, built-up welding working lining
Promptly begin the built-up welding working lining after the transition zone built-up welding finishes, bead-welding technology is as follows:
Resurfacing welding material: SN-YD285 (Ф 4.0mm) flux-cored wire+HJ107 solder flux
Electric power polarity: dc reverse connection;
Welding current: 380-420A;
Weldingvoltage: 30-34V;
Speed of welding: 400-420mm/min;
Stem elongation: 25-30mm;
Eccentric throw: 30-40mm;
Amount of lap: 50-60%;
Interlayer temperature: 300-330 ℃;
Intermediate heat-treatment: must do one time intermediate heat-treatment when monolateral every built-up welding 25-30mm is thick in the working lining weld deposit process, technological parameter is: programming rate is 20-40 ℃/h, be warming up to 500-520 ℃ of insulation 12 hours, continue built-up welding after being cooled to 300-330 ℃ with the cooling velocity of 20-40 ℃/h then.
6, post weld heat treatment
After finishing, the BD2 roll overlaying need carry out post weld heat treatment immediately, technological parameter is: at first heat-treatment furnace is preheated to 330 ℃ of constant temperature and roll was advanced stove in 1 hour, roll is warming up to 560 ± 10 ℃ with 20-40 ℃/h speed after advancing stove, constant temperature 18h is cooled to below 100 ℃ with the cooling velocity of 20-40 ℃/h then and comes out of the stove.
7, roll finished surface turning processing
After the BD2 roll was cooled to room temperature, last lathe carried out turning processing by the figure paper size.
8, carrying out flaw detection
BD2 roll after the turning need carry out blemish check and hardness detects, and through defectives such as magnetic powder detection flawless, slag inclusion, lack of penetration, incomplete fusions, the hardness detection is qualified in the HRC35-42 scope.
The invention has the advantages that weld deposit process is easy to grasp, and easy to operate, overlay cladding thickness is big, Body of roll kerve overlay cladding thickness can reach 80mm, and body of roll sidewall built-up welding thickness can reach 150mm, built-up welding Need adopt sheet iron to make the pushing off the slag circle during sidewall, point is welded on the sidewall, and every built-up welding 25mm is thick for sidewall Pushing off the slag circle of weldering during the left and right sides prevents that overlap, incomplete fusion, lack of penetration or folder from appearring in sidewall edge The defectives such as slag, adopt this technology in weld deposit process and heat treatment after overlay cladding do not produce any splitting Line and other weld defect, surfacing hardness are in the HRC35-42 scope, and deposited metal is strong Good toughness, the antifatigue damage capability is strong.
Claims (6)
1, a kind of section roll build-up welding repair process is characterized in that, it is preceding rough turn that the order of described processing step is followed successively by the roll weldering, carrying out flaw detection, preheating, built-up welding transition zone, built-up welding working lining, post weld heat treatment, roll finished product turning processing, carrying out flaw detection.
2, a kind of section roll build-up welding repair process according to claim 1, it is characterized in that, the roll that flaw detection is qualified is packed into and is carried out weld preheating in the special-purpose thermal insulation cover and handle, programming rate is 20-40 ℃/h, preheat temperature is 350 ℃ ± 10 ℃, and constant temperature cools the temperature to 280-320 ℃ of beginning built-up welding transition zone after 16 hours.
3, a kind of section roll build-up welding repair process according to claim 2 is characterized in that transition zone bead-welding technology parameter is as follows:
Resurfacing welding material: SN-YD1031 (φ 4.0mm) flux-cored wire+SSF solder flux;
Electric power polarity: dc reverse connection; Welding current: 380-420A;
Weldingvoltage: 29-32V; Speed of welding: 400-420mm/min;
Stem elongation: 25-30mm; Eccentric throw: 30-40mm;
Amount of lap: 50-60%; Interlayer temperature: 280-320 ℃.
4, according to the described any a kind of section roll build-up welding repair process of claim 1-3, it is characterized in that the technological parameter of built-up welding working lining is as follows:
Resurfacing welding material: SN-YD285 (Φ 4.0mm) flux-cored wire+HJ107 solder flux
Electric power polarity: dc reverse connection; Welding current: 380-420A;
Weldingvoltage: 30-34V; Speed of welding: 400-420mm/min;
Stem elongation: 25-30mm; Eccentric throw: 30-40mm;
Amount of lap: 50-60%; Interlayer temperature: 300-330 ℃.
5, a kind of section roll build-up welding repair process according to claim 4, it is characterized in that, must do one time intermediate heat-treatment when monolateral every built-up welding 25-30mm is thick in the working lining weld deposit process, programming rate is 20-40 ℃/h, be warming up to 500-520 ℃ of insulation 12 hours, continue built-up welding after being cooled to 300-330 ℃ with the cooling velocity of 20-40 ℃/h then.
6, according to claim 1 or 2 or 3 or 5 described a kind of section roll build-up welding repair process, it is characterized in that, after finishing, built-up welding need carry out post weld heat treatment immediately, at first heat-treatment furnace is preheated to 330 ℃ of constant temperature during heat treatment and roll was advanced stove in 1 hour, roll is warming up to 560 ± 10 ℃ with 20-40 ℃/h speed after advancing stove, constant temperature 18h is cooled to below 100 ℃ with the cooling velocity of 20-40 ℃/h then and comes out of the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610021925 CN101003104A (en) | 2006-09-22 | 2006-09-22 | Built up welding technique of restoring roller for shape bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610021925 CN101003104A (en) | 2006-09-22 | 2006-09-22 | Built up welding technique of restoring roller for shape bar |
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| CN101003104A true CN101003104A (en) | 2007-07-25 |
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