CN104625556A

CN104625556A - Method for achieving circle shear blade build-up welding repair

Info

Publication number: CN104625556A
Application number: CN201410787380.8A
Authority: CN
Inventors: 牛建业; 丁志勇; 韩义安; 张绍国; 祝继奎; 李晓峰; 张俊峰; 朱小山; 向德文; 王亮
Original assignee: Qinhuangdao Shouqin Metal Materials Co Ltd
Current assignee: Qinhuangdao Shouqin Metal Materials Co Ltd
Priority date: 2014-12-17
Filing date: 2014-12-17
Publication date: 2015-05-20

Abstract

The invention provides a method for achieving circle shear blade build-up welding repair, and belongs to the technical field of build-up welding. The method includes the specific steps of selecting and distributing welding materials; machining a shear blade; determining welding parameters; conducting the temper temperature process, wherein the low-temperature tempering at a temperature of 260 DEG C to 280 DEG C is conducted before repair is conducted, heat preservation is conducted for 2 hours, high-temperature tempering at a temperature of 500 DEG C to 520 DEG C is conducted after repair is conducted, heat preservation is conducted for 2 hours, tempering at a temperature of 500 DEG C to 520 DEG C is conducted after finished products are obtained through machining, and heat preservation is conducted for 2 hours. According to the parameters, the welding speed ranges from 450 mm/min to 550 mm/min, the current ranges from 280 A to 350 A, the voltage ranges from 28 V to 32 V, and the pressing and covering amount ranges from 50% to 60%. The method has the advantages that repair devices are popular, the procedure control is easy, the production efficiency is high, old parts are remanufactured, incomes are increased, and expenses are reduced.

Description

A kind of method realizing disc shear edge Bead weld repair

Technical field

The invention belongs to technique for overlaying field, particularly a kind of method realizing disc shear edge Bead weld repair.Mainly for the cutting edge of the circle shear on steel rolling production-line steel plate longitudinal edge shearing equipment, provide a kind of old method manufactured again, the serviceability of former cutting edge can be reached, again can cost efficiency, realize increasing income and economizing on spending.

Background technology

Disc shear edge is one of important spare part of Hot-rolled Middle Plate factory finished product sheet shearing longitudinal edge, it is diameter 1000mm*80mm two-sided use rapid wear class huge tool, failure mode in cutting edge use procedure is tipping and root face, requires that cutting edge has enough toughness and elevated temperature strength.The serviceability that the perfect adaptation of flexible and intensity just can make cutting edge reach good.Originally rotary cutter edge is just scrapped after using 980mm by cycle reconditioning and is not reused.Because single rotary cutter edge is expensive, enterprise is made to spend more buying expenses.The high cost that the present invention is directed to rotary cutter edge and the feature do not reused start to grope build-up welding repair process, and succeed at one stroke.

Summary of the invention

The object of the present invention is to provide a kind of method realizing disc shear edge Bead weld repair.Solve the problem that disc shear edge is not easily repaired again.Disc shear edge can reach the serviceability of former cutting edge after repairing.

The present invention mainly comprises the apolegamy of welding material, the machining of cutting edge, welding parameter, temperature technique.Concrete technology step and parameter as follows:

1, the apolegamy of welding material: phosphorus content and hardness first with reference to mother metal during selection welding material, then considers every mechanical property, heat resistance, high temperature hardness, wearability and toughness.Phosphorus content 0.1-the 0.2wt% lower than the phosphorus content of mother metal of welding material, overlay hardness HRC48-52.In order to improve the solderability of mother metal and overlay cladding, use a kind of transition zone welding wire, transition zone below welding wire carbon content C:0.2wt%, overlay hardness is between HRC28-32.Solder flux is the performance important materials ensureing overlay cladding, and select solder flux mainly to consider in welding process few to wire composition scaling loss, the S content of sintered flux is at below 0.04wt%, AL ₂o ₃+ MnO is 28-31wt%.

2, the machining of cutting edge: the processing of fatigue layer before repairing before this, then do reparation aft-loaded airfoil by figure paper size.

3, welding parameter is determined: in order to improve the performance of wlding in welding process, reduce the dilution with mother metal, improve deposition rate, reduce the scaling loss of welding wire by opposition method, speed of welding is 450-550mm/min, current range 280-350A, according to welding bead shaping situation adjustment voltage, voltage range 28-32V, the gland amount according to welding bead adjusts transverse moving speed, and gland amount is 50%-60%.

4, temperature technique: repair front 260-280 DEG C of lonneals, insulation 2h, carries out Bead weld repair afterwards, and object is the residual stress after eliminating cutting edge use, reduces the welding stress of repair process simultaneously; 500-520 DEG C of high temperings after repairing, insulation 2h, cools to less than 100 DEG C with the furnace, and object eliminates welding stress; Be processed as 500-520 DEG C of tempering after finished product, insulation 2h, cools to 300-350 DEG C with the furnace, air cooling of coming out of the stove, object crystal grain thinning tissue raising surface property.

The invention has the advantages that: prosthetic appliance is universal, operation controls simply, high, old of production efficiency manufactures, increases income and economizes on spending.

Detailed description of the invention

Embodiment 1

1, disc shear edge material 55CrNiW, in order to the wear-resisting working lining making cutting edge surface obtain high strength, high tenacity, to adapt to the condition of work in cutting edge use procedure, by carrying out impact test under hardness test, metal ingredient chemical examination, metallographic structure analysis, Abrasion test and normal temperature to the material after mother metal and multiple deposition, the YJ259-S (C:0.35 that final choice Liao Zhong smelting group institute of welding is produced; Cr:6.0; Mo:1.20; W:2.0; Si:0.90; Mn:1.80 other: 0.6) welding wire is as built-up welding cutting edge working layer, and welding wire is organized as martensite, and carbide dispersion is distributed on martensite basis, hardness HRC50.8; In order to well be combined with mother metal, transition zone welding wire also have selected the YJ011-S (C:0.12 that Zhong Ye group institute of welding is produced; Cr:0.70; Si:0.80; Mn:1.80) be organized as ferrite+granular bainite welding wire, hardness HRC28, match the solder flux Main Ingredients and Appearance that a scaling loss is smaller: CaO+MgO 31.43% simultaneously; AL ₂o ₃+ MnO 29.56%; SiO ₂+ TiO ₂23.42%; CaF ₂+ FeO16.11%; S 0.035%; P 0.041%.

2, the machining of cutting edge, disc shear edge diameter 1000mm*80mm, diameter is less than 980mm and will scraps, add and should consider that overlay properties also will avoid the waste of welding material man-hour, by observing the abrasion condition used on the machine after characteristic and use of disc shear edge, final selection cutting edge both sides 20mm presses 970mm processing, and middle 40mm presses 978mm processing.

3, welding parameter: the welding parameter of two-layer transition zone welding wire; Ground floor selects high-speed welding, welds fast 550mm/min, electric current 350A, voltage 32V, gland amount 55%, and the second layer selects steadily welding, welds fast 470mm/min, electric current 290, voltage 28V, gland amount 60%.The welding parameter of working lining implements welding according to the optimal parameter after the adjustment of second layer transition zone.

4, temperature technique: repair front 270 DEG C of lonneals, insulation 2h, carries out Bead weld repair afterwards, and object is the residual stress after eliminating cutting edge use, reduces the welding stress of repair process simultaneously; Repair rear 500 DEG C of high temperings, insulation 2h, cools to less than 90 DEG C with the furnace, and object eliminates welding stress; Be processed as 510 DEG C of tempering after finished product, insulation 2h, cools to 320 DEG C with the furnace, air cooling of coming out of the stove, object crystal grain thinning tissue raising surface property.

The mechanics property analysis of disc shear edge mother metal and built-up welding deposited metal:

1. built-up welding exemplar hardness test

Adopt HL-160A Leeb Hardness Tester to measure the hardness number of bead weld specimen (two groups), result is as shown in table 1:

Table 1 built-up welding exemplar hardness number

2. disc shear edge mother metal hardness test

Adopt HL-160A Leeb Hardness Tester to measure the hardness number of disc shear edge mother metal, result is as shown in table 2:

Table 2 disc shear edge mother metal hardness number

3. Abrasion test

Adopt ML-10 grain-abrasion testing machine to test, the results are shown in Table 3:

Table 3 abrasive grain wear test data

4. tension test

Tension test is undertaken by GB/T2652, and normal temperature impact test adopts the method for GB/T2650 to carry out.The tensile strength of deposited metal tension test is 1610MPa, and the tensile strength of disc shear edge mother metal is 1680MPa.Impact test result of the test is in table 4, and wherein deposited metal test specimen is numbered A, and disc shear edge mother metal is numbered B.

Table 4 impact test test data

Claims

1. realize a method for disc shear edge Bead weld repair, it is characterized in that, concrete steps and parameter as follows:

1) apolegamy of welding material: the phosphorus content 0.1-0.2wt% lower than the phosphorus content of mother metal of welding material, overlay hardness HRC48-52; Transition zone below welding wire carbon content C:0.2wt%, overlay hardness is between HRC28-32; The S content of sintered flux is at below 0.04wt%, AL ₂o ₃+ MnO is 28-31wt%;

2) machining of cutting edge: the processing of fatigue layer before repairing before this, then do reparation aft-loaded airfoil by figure paper size;

3) determine welding parameter: speed of welding is 450-550mm/min, current range 280-350A, voltage range 28-32V, gland amount is 50%-60%;

4) temperature technique: repair front 260-280 DEG C of lonneals, insulation 2h, carries out Bead weld repair afterwards; 500-520 DEG C of high temperings after repairing, insulation 2h, cools to less than 100 DEG C with the furnace; Be processed as 500-520 DEG C of tempering after finished product, insulation 2h, cools to 300-350 DEG C with the furnace, air cooling of coming out of the stove.