Flux-cored wire and method for welding cold-rolled back-up roll by same

A technology of flux-cored welding wire and support roller, which is applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve problems such as shedding, cracks, and insufficient wear resistance, and achieve improved service life, simple operation process, and no welding defects. Effect

Inactive Publication Date: 2010-06-09
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a flux-cored welding wire and its welding method for cold-rolled back-up rolls, so as to solve the problems of local shedding, insufficient wear resistance and cracks in the cold-rolled back-up rolls during the working process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: For repairing tensile strength ≥ 1500N / m 2 9Cr2Mo series of cold rolling backup rolls.

[0023] Flux-cored welding wire of the present invention, according to cold-rolled work roll performance requirements, select following alloy powder: ferrochromium, tungsten carbide, ferromolybdenum, ferrosilicon, vanadium iron, nickel iron, iron powder, tungsten iron, and its particle size is 60~ 120 mesh, mixed evenly according to the proportion and put into the feeder of the flux-cored wire rolling machine. When the wire rolling machine is working, the uniformly mixed powder is stably and evenly sprinkled on the flux-cored wire sheathed steel strip to wrap it into a tube, and then After being drawn by a wire drawing machine, the outer diameter is made of Tubular flux-cored wire; the chemical composition of the flux-cored wire should be controlled within:

[0024] Carbon C: 0.25%, Silicon Si: 0.30%, Manganese Mn: 1.50%, Chromium Cr: 5.50, Molybdenum M0: 1.50%, Tungste...

Embodiment 2

[0025] Example 2: for repairing tensile strength ≥ 1600N / mm 2 9Cr2Mo series of cold rolling backup rolls.

[0026] Flux-cored welding wire of the present invention, according to cold-rolled work roll performance requirements, select following alloy powder: ferrochromium, tungsten carbide, ferromolybdenum, ferrosilicon, vanadium iron, nickel iron, iron powder, tungsten iron, and its particle size is 60~ 120 mesh, mixed evenly according to the proportion and put into the feeder of the flux-cored wire rolling machine. When the wire rolling machine is working, the uniformly mixed powder is stably and evenly sprinkled on the flux-cored wire sheathed steel strip to wrap it into a tube, and then After being drawn by a wire drawing machine, the outer diameter is made of Tubular flux-cored wire; the chemical composition of the flux-cored wire should be controlled within:

[0027] C: 0.30%, Si: 0.40%, Mn: 1.60%, Cr: 5.80, Mo: 1.70%, W: 1.50%, V: 0.42%, Ni: 2.00%, sulfur (S): 0.020, p...

Embodiment 3

[0028] Example 3: repair tensile strength ≥ 1600N / mm 2 9Cr2Mo series of cold-rolled work rolls.

[0029] The specifications of the cold-rolled work rolls are (Roll face width). The fatigue layer of the cold-rolled work rolls used to the limit size is turned off, and the following methods are used for surfacing repair:

[0030] 1. Machining and non-destructive testing: machine the old cold-rolled work rolls of the limit size or the newly produced low-medium alloy steel cold-rolled work rolls to the size to be welded, and go through magnetic particle and ultrasonic flaw detection to ensure that Cold-rolled work rolls are free from defects.

[0031] 2. Preheating: Preheat the cold-rolled work rolls with no flaws in the flaw detection to 350-450°C, and keep them at this temperature for 6 hours.

[0032] 3. Constant temperature surfacing operation: use special flux-cored wire for repairing and manufacturing of special cold-rolled work rolls, keep the temperature between the su...

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Abstract

The invention discloses a flux-cored wire and a method for welding a cold-rolled back-up roll by the same, and relates to the welding technology. By using a steel strip as a sheath, the flux-cored wire comprises the following components in percentage by mass: 0.15 to 0.50 percent of carbon, 0.10 to 1.00 percent of silicon, 0.30 to 2.00 percent of manganese, 3.50 to 7.00 percent of chromium, 0.50 to 2.50 percent of molybdenum, 1.00 to 3.50 percent of tungsten, 0.20 to 1.00 percent of vanadium, 0.20 to 3.00 percent of nickel, 0 to 0.03 percent of sulfur, 0 to 0.03 percent of phosphorus, and the balance of iron. The flux-cored wire needs to maintain the surfacing interpass temperature of the cold-rolled back-up roll between 300 and 350 DEG C during constant temperature surfacing work. The flux-cored wire well solves the problem that the intensity of a surfacing material is not matched with the toughness after surfacing of the cold-rolled work roll, so that the hot-rolled back-up roll has high intensity and excellent toughness. Therefore, the service life of the cold-rolled back-up roll is improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a flux-cored welding wire and a method for welding cold-rolled backup rolls thereof. Background technique [0002] Cold-rolled back-up rolls are an important bulk consumption part in cold-rolled sheet production, and their quality accuracy directly affects the quality of rolled coils, while the roll consumption of cold-rolled rolls is an important technical and economic index. Due to its harsh working conditions and extremely high working stress, the surface often fails in the form of peeling, falling off, and abrasion during the working process. Therefore, the surface is required to have relatively high hardness, wear resistance and crack resistance. At present, most of the cold-rolled backup rolls at home and abroad use carbon and alloy element content such as: 9Cr2, 9Cr2Mo, 9CrV, 75CrMoV, 86CrMoV 7 , 85CrMoV7 and other materials are integrally manufactured, and then surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23P15/00B23K9/04B23K9/235C21D9/38
Inventor 眭向荣段斌白波刘景凤王清宝张迪宋世旭符定梅沈亚威张海波马计平
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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