CN101011785A - Cr13 series overlay welding self-protection flux-cored wire - Google Patents

Abstract

The invention relates to the Cr13 series build-up self-shielded welding wire aiming to solve the wastes of material, low production efficiency, complex equipment and high cost of existing build-up welding material. It features in the mass percentage of calcium fluoride 10-20%, barium fluoride 10-20%, soda 1-2%, chrome metal 30-40%, metal powder 3-10%, manganese metal 3-5%, high carbon ferro-chrome 0-6%, Al-Mg alloy 8-14%, potassium titanate 3-7%, magnesia 2-5%. It has stable electric arc, good welding seam, easy for slag peeling clinker coating, with good self-shield effect in the welding process.

Description

Cr13 series built-up welding self-protection flux-cored wire

Technical field

The invention belongs to the welding field in the Materials Processing Engineering, is to utilize carbon steel steel band parcel alloy powder to make the self-protection flux-cored wire of deposited metal for Cr13 series 1Cr13 and 2Cr13 type.This invention is mainly used in the reparation welding of materials such as the axle class that is operated under heat-resisting, corrosion-resistant, the condition of work of resistance to wearing, valve type.

Background technology

In recent years, re-manufacturing technology is greatly developed and extensive use, by overlaying method the heavy parts that is operated under the mal-condition is repaired, and recovers its serviceability, increases the service life, and has saved resource greatly, reduces production costs.Cr13 type stainless steel has good anti-corrosion, heat-resisting and wear-resisting combination property, wheel shaft, and the pressure vessel valve has extensive use in the strength member productions such as turbine blade.Adopt the overlaying method transition alloy elements very general in the production of these parts and maintenance process.At present Cr13 type built-up welding welding material is based on welding rod, inefficiency, and waste of material rate height, the application of flux-cored wire mainly concentrates on metal-cored or the gas-shielded flux-cored wire field, and equipment cost and material cost are higher relatively, and also there is certain limitation the application scenario.In welding process, the hydrogen that is added in the weld seam is the key factor of inducing crackle to produce, and has retardance, probably cracks in any time of postwelding in one or two years, and is very dangerous.

At above-mentioned situation, develop a kind of high fluoride basic slag system self-protection flux-cored wire.By carbon steel steel band H08A parcel alloy powder transition alloy elements, by suitable adjustment phosphorus content, make deposited metal be reached for 1Cr13 or the stainless requirement of 2Cr13, its characteristics are to make sheetmetal with carbon steel band, reach the composition requirement of Cr13; More fluoride is as the slag making material, and can reach good slag and cover, and effectively flux shielding carried out in the transition of alloying element, and the control diffusible hydrogen content reduces the possibility of generation delayed crack in the use; Particularly material cost is relatively low, and the application scenario is flexible, and equipment is simple, and production efficiency is good, and welding procedure is good, has the good prospect of marketing.

Relevant patent report is not seen in the development of high fluoride basic slag system self protection pile-up welding flux core welding wire at home and abroad as yet.

Summary of the invention

Problem to be solved by this invention is to rely on carbon steel band parcel alloy powder to make flux-cored wire; need not add gas shield during welding; make deposited metal reach 1Cr13 or the stainless composition requirement of 2Cr13; hardness number 1Cr13 reaches HRC 〉=40; 2Cr13 reaches HRC 〉=45 requirements; has the favorable manufacturability energy, as slag spreadability, the removability of slag, arc stability, low spatter performance.Under the high fluoride condition, can have good anti-pore ability and arc stability.

A kind of high fluoride Cr13 series built-up welding self-protection flux-cored wire is characterized in that described drug core component quality percentage composition scope is as follows:

Calcirm-fluoride: 10～20%; Barium fluoride: 10～20%; Sodium carbonate: 1～2%; Crome metal 30～40%; Iron powder: 3～10%; Manganese metal: 3～5% high carbon ferro-chromes: 0～6%; Al-Mg alloy: 8～14%; Potassium titanate: 3～7%; Magnesia 2～5%.

Calcirm-fluoride: the slag making material, the shoddye agent helps reducing diffusible hydrogen content.

Barium fluoride: the slag making material, help improving slag melting point, support the short arc welding simultaneously, improve slag spreadability, the removability of slag and appearance of weld.

Sodium carbonate: gas making, slag making, possess certain stabilising arc effect simultaneously.

Crome metal: to the weld seam transition alloy elements.

Fe powder:, improve conductance to the weld seam transition metal.

Manganese metal: deoxidation, desulfurization, to the weld seam transition alloy elements, deoxidation products enters slag.

High carbon ferro-chrome:, adjust the deposited metal carbon content to the weld seam transition alloy elements.The quality percentage composition is 0～3% o'clock, and deposited metal satisfies the requirement of 1Cr13 composition; The quality percentage composition is 3～6% o'clock, and deposited metal composition satisfies the requirement of 2Cr13 composition.

The Al-Mg alloyed powder: main effect is deoxidation, decides nitrogen, protects the transition of useful alloying elements such as chromium.The Al that generates after the deoxidation ₂O ₃, MgO has fluxing effect.

Potassium titanate: main effect is the refinement molten drop, and reduction is splashed.

Magnesia: the high-melting-point material helps adjusting the fusing point of slag, improves the slag spreadability.

Characteristics such as flux-cored wire provided by the present invention has arc stability, and deflection is good, and appearance of weld is good, and slag covers and be easy to take off slag, and the welding process self-shield is respond well.This welding wire is mainly used in surface overlaying, repair welding and the reparation of parts such as reach class, valve type, turbine blade, has certain heat-resisting, corrosion-resistant, wear resistance.

Preparation method of the present invention adopts prior art, may further comprise the steps:

1, steel band is rolled into U-shaped, in U-lag, add 20～30% the medicinal powder of the present invention account for welding wire gross weight of the present invention;

2, U-lag is healed up, make the medicinal powder parcel wherein,,, make its diameter reach 2.0mm at last, obtain final products by road drawing, tube reducing by wire drawing die.

The specific embodiment:

All embodiment welding wires all are that " the passive drawing formula of the FCWM50 flux-cored wire machine " that adopt Kunming Heavy Machinery Factory to produce made.Selecting width for use is 10～14mm, and thickness is the H08 carbon steel steel band of 0.3～0.4mm.Earlier it is rolled into U-shaped, adding granularity again in U-lag was 40～80 purpose mixed powders, and adding powder coefficient (medicinal powder weight accounts for the percentage of welding wire gross weight) is 20～30%.Then U-lag is healed up, make the medicinal powder parcel wherein.Specific embodiments is as follows:

Embodiment 1: the H08 carbon steel steel band of selecting 14 * 0.3 (width is 14mm, and thickness is 0.3mm) for use.Earlier it is rolled into U-shaped.With calcirm-fluoride powder 10 grams, barium fluoride powder 20 grams, powdered sodium carbonate 1 gram, crome metal powder 30 grams, iron powder 8 grams, manganese metal powder 5 grams, high carbon ferro-chrome powder 3 grams, al-mg alloy powder 14 grams, potassium titanate powder 7 grams, magnesia powder 2 grams (institute's powder of getting is all by 60 order sub-sieves) mix.In mixed powder machine, fully mix, add in the U-lag, make that to add the powder coefficient be 30%.U-lag is healed up, make the medicinal powder parcel wherein.Make it by diameter be respectively then: the wire drawing die of 4.2mm, 3.6mm, 3.3mm, 3.15mm, 2.95mm, 2.7mm, 2.5mm, 2.3mm, 2.1mm, 1.96mm by road drawing, tube reducing, makes its diameter reach 2.0mm at last.Under the unprotect gas condition, weld, four layers of built-up welding, welding current is 250～350A, weldingvoltage 26～30V, speed of welding is 0.5m/min, 150～300 ℃ of interlayer temperature controls.Postwelding inspection pore, crackle, mensuration are taken off slag rate, overlay cladding deposited metal hardness and relative wear resistance, see Table 1.

Embodiment 2: the H08 carbon steel steel band of selecting 14 * 0.4 (width is 14mm, and thickness is 0.4mm) for use.Earlier it is rolled into U-shaped.Calcirm-fluoride powder 15 grams, barium fluoride powder 15 grams, powdered sodium carbonate 2 grams, crome metal powder 35 grams, iron powder 5 grams, manganese metal powder 4 grams, high carbon ferro-chrome powder 6 grams, al-mg alloy powder 8 grams, potassium titanate powder 5 grams, magnesia powder 5 grams (institute's powder of getting is all by 80 order sub-sieves) are mixed.In mixed powder machine, fully mix, add in the U-lag, make that to add the powder coefficient be 20%.U-lag is healed up, make the medicinal powder parcel wherein.Make it by diameter be respectively then: the wire drawing die of 4.2mm, 3.6mm, 3.3mm, 3.15mm, 2.95mm, 2.7mm, 2.5mm, 2.3mm, 2.1mm, 1.96mm by road drawing, tube reducing, makes its diameter reach 2.0mm at last.Weld under the unprotect gas condition, welding current is 250～350A, weldingvoltage 26～30V, and speed of welding is 0.5m/min, 150～300 ℃ of interlayer temperature controls.Postwelding inspection pore, crackle, mensuration are taken off slag rate, overlay cladding deposited metal hardness and relative wear resistance, see Table 1.

Embodiment 3: the H08 carbon steel steel band of selecting 10 * 0.3 (width is 10mm, and thickness is 0.3mm) for use.Earlier it is rolled into U-shaped.With calcirm-fluoride powder 10 grams, barium fluoride powder 20 grams, powdered sodium carbonate 1.5 grams, crome metal powder 40 grams, iron powder 3 grams, manganese metal powder 4 grams, high carbon ferro-chrome powder 4.5 grams, al-mg alloy powder 10 grams, potassium titanate powder 4 grams, magnesia powder 3 grams (institute's powder of getting is all by 80 order sub-sieves) mix.In mixed powder machine, fully mix, add in the U-lag, make that to add the powder coefficient be 25%.U-lag is healed up, make the medicinal powder parcel wherein.Make it by diameter be respectively then: the wire drawing die of 2.8mm, 2.6mm, 2.4mm, 2.25mm, 2.1mm, 1.96mm by road drawing, tube reducing, makes its diameter reach 2.0mm at last.Weld under the unprotect gas condition, welding current is 250～350A, weldingvoltage 26～30V, and speed of welding is 0.5m/min, 150～300 ℃ of interlayer temperature controls.Postwelding inspection pore, crackle, mensuration are taken off slag rate, overlay cladding deposited metal hardness and relative wear resistance, see Table 1.

Embodiment 4: the H08 carbon steel steel band of selecting 14 * 0.3 (width is 14mm, and thickness is 0.3mm) for use.Earlier it is rolled into U-shaped.With calcirm-fluoride powder 10 grams, barium fluoride powder 20 grams, powdered sodium carbonate 1 gram, crome metal powder 30 grams, iron powder 8 grams, manganese metal powder 5 grams, high carbon ferro-chrome powder 3 grams, al-mg alloy powder 14 grams, potassium titanate powder 7 grams, magnesia powder 2 grams (institute's powder of getting is all by 60 order sub-sieves) mix.In mixed powder machine, fully mix, add in the U-lag, make that to add the powder coefficient be 30%.U-lag is healed up, make the medicinal powder parcel wherein.Make it by diameter be respectively then: the wire drawing die of 4.2mm, 3.6mm, 3.3mm, 3.15mm, 2.95mm, 2.7mm, 2.5mm, 2.3mm, 2.1mm, 1.96mm by road drawing, tube reducing, makes its diameter reach 2.0mm at last.Under the unprotect gas condition, weld, four layers of built-up welding, welding current is 250～350A, weldingvoltage 26～30V, speed of welding is 0.5m/min, 150～300 ℃ of interlayer temperature controls.Postwelding inspection pore, crackle, mensuration are taken off slag rate, overlay cladding deposited metal hardness and relative wear resistance, see Table 1.

Embodiment 5: the H08 carbon steel steel band of selecting 14 * 0.4 (width is 14mm, and thickness is 0.4mm) for use.Earlier it is rolled into U-shaped.Calcirm-fluoride powder 15 grams, barium fluoride powder 15 grams, powdered sodium carbonate 2 grams, crome metal powder 36 grams, iron powder 9 grams, manganese metal powder 4 grams, high carbon ferro-chrome powder 0 gram, al-mg alloy powder 8 grams, potassium titanate powder 6 grams, magnesia powder 5 grams (institute's powder of getting is all by 80 order sub-sieves) are mixed.In mixed powder machine, fully mix, add in the U-lag, make that to add the powder coefficient be 20%.U-lag is healed up, make the medicinal powder parcel wherein.Make it by diameter be respectively then: the wire drawing die of 4.2mm, 3.6mm, 3.3mm, 3.15mm, 2.95mm, 2.7mm, 2.5mm, 2.3mm, 2.1mm, 1.96mm by road drawing, tube reducing, makes its diameter reach 2.0mm at last.Weld under the unprotect gas condition, welding current is 250～350A, weldingvoltage 26～30V, and speed of welding is 0.5m/min, 150～300 ℃ of interlayer temperature controls.Postwelding inspection pore, crackle, mensuration are taken off slag rate, overlay cladding deposited metal hardness and relative wear resistance, see Table 1.

Embodiment 6: the H08 carbon steel steel band of selecting 10 * 0.3 (width is 10mm, and thickness is 0.3mm) for use.Earlier it is rolled into U-shaped.With calcirm-fluoride powder 10 grams, barium fluoride powder 20 grams, powdered sodium carbonate 1.5 grams, crome metal powder 40 grams, iron powder 3 grams, manganese metal powder 4 grams, high carbon ferro-chrome powder 1.5 grams, al-mg alloy powder 12 grams, potassium titanate powder 5 grams, magnesia powder 3 grams (institute's powder of getting is all by 80 order sub-sieves) mix.In mixed powder machine, fully mix, add in the U-lag, make that to add the powder coefficient be 25%.U-lag is healed up, make the medicinal powder parcel wherein.Make it by diameter be respectively then: the wire drawing die of 2.8mm, 2.6mm, 2.4mm, 2.25mm, 2.1mm, 1.96mm by road drawing, tube reducing, makes its diameter reach 2.0mm at last.Weld under the unprotect gas condition, welding current is 250～350A, weldingvoltage 26～30V, and speed of welding is 0.5m/min, 150～300 ℃ of interlayer temperature controls.Postwelding inspection pore, crackle, mensuration are taken off slag rate, overlay cladding deposited metal hardness and relative wear resistance, see Table 1.

The mensuration of taking off the slag rate adopts 45 ⁰The drop weight method of built-up welding test in the double V-groove, test plate (panel) is opened double V-groove, the heavy 3Kg of steel ball, during dull and stereotyped built-up welding, from back side hammering welding bead over against the position.When welding in the groove, the test stand height transfers to 1000mm, pounds with steel ball immediately after the built-up welding and hits the welding bead back side, pounds and hits 5 times.Taking off the slag rate calculates by formula (1).Take off the slag rate and see Table 1.

$D=\frac{L-(L_0+{0.5L}_1+{0.2L}_2)}{L}\×100\%---\left(1\right)$

In the formula: D---take off slag rate (%);

L---welding bead total length (mm);

L ₀---do not take off slag length (mm);

L ₁---serious dry slag length (mm);

L ₂---slight dry slag length (mm)

Hardness that table 1 is beaten adopts HR-150A Rockwell hardness machine, and load is 150kg, each overlay cladding is got at 6 beat hardness, obtains the average Rockwell hardness number of this welding wire built-up welding layer at last.

Table 1 embodiment effect

Claims (1)

1, a kind of Cr13 series built-up welding self-protection flux-cored wire is characterized in that described drug core component quality percentage composition scope is as follows:

Calcirm-fluoride: 10～20%; Barium fluoride: 10～20%; Sodium carbonate: 1～2%; Crome metal 30～40%; Iron powder: 3～10%; Manganese metal: 3～5% high carbon ferro-chromes: 0～6%; Al-Mg alloy: 8～14%; Potassium titanate: 3～7%; Magnesia 2～5%.