Flux-cored wire for welding rotary cutter edge and method thereof

A technology of flux-cored welding wire and disc shear, applied in the field of flux-cored welding wire and welding disc shearing edge, can solve the problems of chipping, blunt edge, etc., achieve no welding defects, improve wear resistance and toughness, and improve the operation process. simple effect

Inactive Publication Date: 2009-04-15
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most disc shears are not reused after they are used to the scrap size. The main problems in the working process are chipping and blunt edges.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: For repairing tensile strength ≥ 1500N / mm 2 55NiCrW disc shears for hot work die series.

[0024] Flux-cored welding wire of the present invention, according to disc shearing edge performance requirement, select following alloy powder: ferrochrome, tungsten carbide, ferromolybdenum, ferrosilicon, ferrovanadium, ferronickel, iron powder, ferrotungsten, its granularity 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 2.4mm tubular flux-cored wire; the chemical composition of the flux-cored wire should be controlled at:

[0025] C: 0.15%, Si: 2.00%, Mn: 0.30%, Cr: 7.00, Mo: 0.50%, W: 3.50%, V: 0.20%, Ni: 1.00%, and the balance is iron.

Embodiment 2

[0026] Example 2: for repairing tensile strength ≥ 1550N / mm 2 Disc shear blades of the H13 hot work die series,

[0027] Process ferrochromium, tungsten carbide, ferromolybdenum, ferrosilicon, ferrovanadium, ferronickel, iron powder and ferro-tungsten alloy powder into a particle size of 60-120 mesh, mix them evenly and put them into the distributor 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 sheath steel strip to wrap it into a tube, and then drawn through a wire drawing machine to make an outer diameter of 3.2mm tubular flux-cored wire; the chemical composition of the tubular flux-cored wire should be controlled at: C: 0.40%, Si: 0.50%, Mn: 2.00%, Cr: 4.00%, Mo: 2.50%, W: 1.00 %, V: 1.00%, Ni: 0.20%, S: 0.03%, P: 0.03%, and the balance is iron.

Embodiment 3

[0028] Example 3: repair tensile strength ≥ 1500N / mm 2 55NiCrW Hot Work Die Series Disc Shears,

[0029] The disc shear blade specifications are 1000mm×80mm (thickness). Cut off the fatigue layer of the disc shear blade used to the limit size, and use the following method for surfacing repair:

[0030] 1. Machining and non-destructive testing: machine the old disc shear blades of the limit size or the newly produced low-medium alloy steel disc shear blades to the size to be welded, and go through magnetic particle and ultrasonic flaw detection to ensure that the surfacing welding manufacturing Disc blades are free from defects.

[0031] 2. Preheating: Preheat the disc scissors with no flaws in the flaw detection to 350-450°C, and keep it at this temperature for 4 hours.

[0032] 3. Constant temperature surfacing operation: use special disc shears to repair and manufacture special flux cored wire (another patent content), keep the temperature between the surfacing layers o...

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Abstract

The invention provides a flux-cored wire for welding a circular shear edge. The flux-cored wire has a steel belt as an outer skin, wherein the flux core comprises the following components in weight percentage: 0.15 to 0.40 percent of C, 0.50 to 2.00 percent of Si, 0.30 to 2.00 percent of Mn, 4.00 to 7.00 percent of Cr, 0.50 to 2.50 percent of Mo, 1.00 to 3.50 percent of W, 0.20 to 1.00 percent of V, 0.20 to 1.00 percent of Ni, 0 to 0.03 percent of S, 0 to 0.03 percent of P and the balance being iron. When the flux-cored wire is used for the constant temperature surfacing welding, the interlayer temperature of circular shear edge surfacing welding is kept to be between 300 and 350 DEG C.

Description

technical field [0001] The invention belongs to the fields of welding technology and metallurgical roll repair, and in particular relates to a flux-cored welding wire for welding disc shears. [0002] The present invention also relates to a method for welding disc shears using the flux-cored welding wire. Background technique [0003] The disc shear blade is one of the important spare parts for trimming the edge of the finished plate in the hot-rolled medium plate factory. At present, most disc shears are no longer reused after they are used to the scrap size. The main problems in the working process are chipping and blunt edges. Contents of the invention [0004] The object of the present invention is to provide a flux-cored welding wire for welding disc shears. [0005] Another object of the present invention is to provide a method for welding disc shears with the above-mentioned flux-cored welding wire. [0006] In order to achieve the above, the flux-cored welding w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/12B23P15/40
Inventor 眭向荣沈风刚刘景凤白波张迪王清宝汤春天廖秋尽
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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