CN103320800B - A kind of method and apparatus improving stainless steel weld joint erosion resistance - Google Patents
A kind of method and apparatus improving stainless steel weld joint erosion resistance Download PDFInfo
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- CN103320800B CN103320800B CN201310270921.5A CN201310270921A CN103320800B CN 103320800 B CN103320800 B CN 103320800B CN 201310270921 A CN201310270921 A CN 201310270921A CN 103320800 B CN103320800 B CN 103320800B
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Abstract
The invention discloses a kind of method and the device that improve stainless steel weld joint erosion resistance, first a kind of nano level metal corrosion inhibitor particle is prepared, secondly adopt carbon dioxide laser that nano level metal corrosion inhibitor particle is injected stainless steel weld joint and form one deck corrosion-resistant coating, by nanosecond laser, shock peening process is carried out to stainless steel weld joint surface again, thus form the high-amplitude residual compressive stress layer of certain depth in stainless steel weld joint region.The device implementing the method comprises computer control system, powder feeder, argon protective device, carbon dioxide laser, and be all-trans light microscopic, diaphotoscope, powder-feeding nozzle, stainless steel welded, gripping unit, three-axis numerical control worktable, flexible lamina, nanosecond laser.The present invention can reduce the corrosion susceptibility of stainless steel weld joint in corrosive environment to a great extent, improves its work-ing life, is adapted to the raising of various stainless steel weld joint erosion resistance, also can be extended to the raising of the weld seam such as aluminium alloy, titanium alloy erosion resistance.
Description
Technical field
The present invention relates to the field of improving surface characteristics of metal, be specifically related to a kind of raising stainless steel weld joint erosion resistance technology.
Background technology
Stainless steel welded is widely used in chemical, coastal, field of petrochemical industry due to good mechanical property and low price, but stainless steel welded intergranular corrosion, spot corrosion and stress corrosion crack easily occurs at welding joint place, this seriously constrains stainless steel welded the application under corrosive environment.Therefore the corrosion resistance nature improving weld seam becomes problem in the urgent need to address.In order to improve the erosion resistance of stainless steel weld joint, also carrying out many research both at home and abroad, wherein being laser impact intensifiedly widely used in improving stainless steel weld joint corrosion resistance nature as a kind of emerging technology.
Reiforcing laser impact technology is most important a kind of process for modifying surface, it can produce the residual compressive stress of 100 MPas at material surface, and make Stainless Steel Watch covering weave generation grain refining, under both dual functions, make the corrosion resistance nature of stainless steel weld joint be improved.
The domestic report to how improving stainless steel weld joint erosion resistance is fewer at present, mainly contain the patent of invention that number of patent application is 200610166256.5, denomination of invention is: a kind of raising anticorrosion of austenite stainless steel welding joint method, proposes a kind of remelting processing to improve the erosion resistance of stainless steel welded joint.Not yet find the report being improved stainless steel weld joint erosion resistance by laser fusion injection metal corrosion inhibitor particle in conjunction with laser impact intensified method.
Summary of the invention
The object of this invention is to provide a kind of method and apparatus improving stainless steel weld joint erosion resistance.There is the coating of non-corrosibility in order to increase one deck in stainless steel weld joint region and form darker grain refining layer, the degree of depth in stainless steel weld joint region more than the high-amplitude residual compressive stress layer of 1mm, significantly improving the corrosion resistance nature of stainless steel weld joint.
In order to solve these problems above, the technical solution used in the present invention is as follows.
Improve a method for stainless steel weld joint erosion resistance, it is characterized in that step is as follows:
Step 1, chooses one piece with stainless steel welded of weld seam, carries out pre-treatment to it, and be fixed on three-axis numerical control worktable by good for pre-treatment stainless steel welded;
Step 2,20-50nm metal corrosion inhibitor particle is put into powder feeder, regulate powder-feeding nozzle relative to the angle to 30 ° of stainless steel weld joint surface normal, determine that metal corrosion inhibitor particle injects the position in molten bath and the continuous laser distance be radiated on stainless steel weld joint between position is 5-10mm by mobile powder-feeding nozzle;
Step 3, the Systematical control carbon dioxide laser that computerizeds control give off laser beam direct irradiation stainless steel weld joint surface, 1000-1500 DEG C of molten bath is formed on stainless steel weld joint surface, interval after 3 seconds by powder-feeding nozzle to molten bath metal injection corrosion inhibitor particle, thus form the good corrosion-resistant coating of one deck compactness on the surface of stainless steel weld joint;
Step 4, carries out polishing to the corrosion-resistant coating formed, and make its smooth surface steady, reduce the surfaceness of corrosion-resistant coating, the corrosion-resistant coating thickness after polishing is greater than 0;
Step 5, flexible lamina is posted after a polish on stainless steel welded of corrosion-resistant coating, again Pulsed Laser Parameters is set according to the thickness of stainless steel welded and material behavior: pulsewidth, repetition rate, pulse energy and spot diameter, thus realizes carrying out laser impact intensified to stainless steel weld joint and whole heat-affected zone.
Described metal corrosion inhibitor particle is any one in potassium magnesium phosphate, sodium phosphate magnesium and secondary magnesium phosphate; Described metal corrosion inhibitor particle diameter size is 20-50nm.
Corrosion-resistant coating thickness after described polishing is 0.2-0.4mm.
When carrying out laser fusion injection in described step 3, carbon dioxide laser parameter is: laser power is 3-6kw, sweep velocity is 0.2-1.0m/min, powder sending quantity is 60-150mg/s, and spot size is 1-5mm, when carrying out laser impact intensified in steps of 5, nanosecond laser Pulsed Laser Parameters is: pulsewidth 8 ?30ns, repetition rate be 10 ?20Hz, pulse energy be 5 ?15J, spot diameter be 1 ?5mm.
A kind of device of method of described raising stainless steel weld joint erosion resistance, it is characterized in that: comprise computer control system (1), powder feeder (2), argon protective device (3), carbon dioxide laser (4), be all-trans light microscopic (5), diaphotoscope (6), powder-feeding nozzle (7), continuous laser (8), stainless steel welded (9), gripping unit (10), three-axis numerical control worktable (11), flexible lamina (12), pulse laser (13), diaphotoscope (14), be all-trans light microscopic (15) and nanosecond laser (16), three-axis numerical control worktable (11), powder feeder (2), carbon dioxide laser (4), nanosecond laser (16), diaphotoscope (6) are connected with computer control system (1) respectively with diaphotoscope (14), the light microscopic that is all-trans (4) is equipped with in carbon dioxide laser (4) bright dipping front, is provided with diaphotoscope (6) immediately below the light microscopic that is all-trans (5), the light microscopic that is all-trans (15) is equipped with in nanosecond laser (16) bright dipping front, is provided with diaphotoscope (14) immediately below the light microscopic that is all-trans (15), gripping unit (10) is fixed on three-axis numerical control worktable (11), powder feeder (2) and argon shield device (3) provide metal corrosion inhibitor particle and argon gas for powder-feeding nozzle (7), flexible lamina (12) is attached on stainless steel welded (9).
First utilize computer control system (1) control carbon dioxide laser (4) to launch continuous laser (8) during work and form molten bath on stainless steel weld joint, then control powder feeder (2) for powder-feeding nozzle (7) provide metallic corrosion suppress particle, metallic corrosion suppression particle is ejected in molten bath by powder-feeding nozzle (7) and forms one deck corrosion-resistant coating under the effect of argon gas, then polishing is carried out to stainless steel welded (9) with corrosion-resistant coating, nanosecond laser (16) is finally utilized to carry out laser impact intensified to corrosion-resistant coating under computer control system (1) controls.
The present invention has following beneficial effect:
(1) the present invention selects nano level metal corrosion inhibitor particle can form the good corrosion-resistant coating of one deck compactness in stainless steel weld joint region; the corrosion susceptibility of stainless steel weld joint under corrosive environment can be reduced to a great extent, play the first heavily provide protection.
(2) the present invention proposes to use laser fusion implantttion technique to form corrosion-resistant coating, first carbon dioxide laser fusing weld seam is used, form the molten bath of a high temperature, carry out the injection of nano level metal deactivator particle subsequently, position and the guided laser bundle distance be radiated on stainless steel weld joint between position in nano level metal corrosion inhibitor particle injection molten bath are 5-10mm, can effectively avoid the too high or too low for temperature of molten bath and cause forming fine and close corrosion-resistant coating.
(3) the present invention arranges Pulsed Laser Parameters according to the thickness of stainless steel welded and material behavior, pulsewidth, repetition rate, pulse energy and spot diameter, carry out laser impact intensified to the surface of stainless steel weld joint and heat affected zone, the tensile stress state that stainless steel weld joint region exists can be eliminated, and the high-amplitude residual compressive stress layer of certain depth is formed at stainless steel weld joint and heat affected zone, serve the second heavily provide protection, the erosion resistance of further raising stainless steel weld joint, the present invention is not only applicable to the raising of various corrosion resistant property stainless steel welding seam, also raising aluminium alloy can be applied to, the solidity to corrosion of the weld seams such as titanium alloy.
Accompanying drawing explanation
Fig. 1 is the structural representation of Laser Surface Treatment stainless steel weld joint;
Fig. 2 is that laser fusion injects particle enlarged diagram;
Fig. 3 is laser-impact weld seam enlarged diagram;
Fig. 4 is the unrelieved stress comparison diagram before and after stainless steel weld joint surface treatment;
Fig. 5 is the corrosion life variation diagram before and after stainless steel weld joint surface treatment.
In figure: 1-computer control system 2-powder feeder 3-argon protective device 4-carbon dioxide laser 5-light microscopic 6-diaphotoscope 7-powder-feeding nozzle 8-continuous laser 9-stainless steel welded the 10-gripping unit 11-three-axis numerical control worktable 12-flexible lamina 13-pulse laser 14-diaphotoscope 15-that be all-trans is all-trans light microscopic 16-nanosecond laser 17-stainless steel weld joint 18-metal corrosion inhibitor particle.
Embodiment
Details and the working condition of the concrete device that the present invention proposes is described in detail below in conjunction with Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.
Embodiment one
Device of the present invention, as Fig. 1, comprises laser fusion injection unit, laser impact intensified unit, computer control system and numerical control work system.Laser fusion injection unit comprises carbon dioxide laser 4, the light microscopic 5 that is all-trans, diaphotoscope 6, argon protective device 3, powder feeder 2 and powder-feeding nozzle 7; Laser impact intensified unit comprises nanosecond laser 16, the light microscopic 15 that is all-trans, diaphotoscope 14; Numerical control work system comprises three-axis numerical control worktable 11 and gripping unit 10.
Computer-controlled apparatus 1 controls three-axis numerical control worktable 11, nanosecond laser 3, powder feeder and carbon dioxide laser 12, completes respectively and injects metal corrosion inhibitor particle and laser impact intensified to stainless steel weld joint.The spot diameter of continuous laser 8 and pulse laser 13 regulates respectively by diaphotoscope 6 and diaphotoscope 14, is also controlled by calculating control system 1.
Figure 2 shows that in Fig. 1, laser fusion injects particle enlarged diagram, comprises continuous laser 8, powder-feeding nozzle 7, metal corrosion inhibitor particle 18, stainless steel welded 9, stainless steel weld joint 17.Continuous laser 8 irradiates stainless steel weld joint 17 front, and powder-feeding nozzle 7 metal injection corrosion inhibitor 17 is rear.
Figure 3 shows that laser-impact stainless steel weld joint enlarged diagram in Fig. 1, comprise pulse laser 13, stainless steel welded 9, stainless steel weld joint 17.
Embodiment two
Implementing a kind of concrete steps improving the method for stainless steel weld joint erosion resistance is:
(1) first to pending AISI304 stainless steel welded 9 specimen surface grindings and polished finish, reach surface roughness Ra 1.6, then dry up with acetone cleaning, treated stainless steel welded 9 is placed on three-axis numerical control worktable 11;
(2) the potassium magnesium phosphate particle of 20nm is selected, potassium magnesium phosphate particle is put into powder feeder 2, regulate the angle of powder-feeding nozzle 7 and stainless steel welded 9 surface normals, the distance between the position making the facula position of continuous laser 8 on stainless steel weld joint and potassium magnesium phosphate particle inject molten bath is 5mm;
(3) DL-HL-T5000 carbon dioxide laser 4 is adopted, predetermined power is 3kw, zlasing mode is TEM00, spot diameter is 1mm, handle three-axis numerical control worktable 11 by computer control system 1 to move, sweep velocity is 0.2m/min, in the molten bath that stainless steel weld joint surface formation temperature is very high, and then PEL-1A powder feeder 2 is adopted, powder feeding rate controls at about 60mg/s by powder feeder 2, spray in molten bath through powder-feeding nozzle 7 under argon shield, form the good corrosion-resistant coating of one deck compactness on stainless steel weld joint surface after cooling;
(4) after stainless steel weld joint surface forms one deck corrosion-resistant coating, stainless steel welded 9 is taken off from three-axis numerical control worktable 11, grinding is carried out and polished finish to stainless steel welded 9 specimen surfaces processed, make its surfaceness reach Ra1.6, the corrosion-resistant coating thickness after polishing is 0.2mm.
(5) flexible lamina 12 is sticked on stainless steel welded 9 surfaces, stainless steel welded 9 that posts flexible lamina 12 is fixed on three-axis numerical control worktable 11, the processing parameter being set nanosecond laser 16 by computer control system 1 moves to below pulse laser 13 with control three-axis numerical control worktable 11, adopt Nd:YAG laser apparatus, optical maser wavelength is 1064nm, pulsewidth is 8ns, spot radius is 1mm, pulse energy is 5J, repetition rate 10Hz, overlapping rate is 50%, pulse laser 13 is sent by nanosecond laser 16, through being all-trans light microscopic and diaphotoscope, be radiated at work surface, implement laser impact intensified,
The residual stress distribution situation of AISI304 stainless steel weld joint before and after surface treatment as shown in Figure 4, can find out, within the scope of certain depth, unrelieved stress changes compressive stress state into by original tensile stress, residual compressive stress affects layer and is approximately about 1mm, inhibit the corrosion susceptibility of stainless steel weld joint in corrosive environment, extend the corrosion life of stainless steel weld joint, before and after the surface treatment of AISI304 stainless steel weld joint, corrosion life as shown in Figure 5.
Embodiment three:
Be pulse energy by nanosecond laser 16 parameter change in embodiment two be 10J, spot radius is 3mm, and pulsewidth is 20ns and repetition rate is 15Hz; Carbon dioxide laser 4 parameter change is spot diameter is 3mm, and laser power is 5kw, and scanning speed is 0.6m/min and powder feeding rate is 100mg/s; Metal corrosion inhibitor particle selects the sodium phosphate magnesium of 35nm; Corrosion-resistant coating thickness after polishing is 0.3mm.
Embodiment four:
Be pulse energy by nanosecond laser 16 parameter change in embodiment two be 15J, spot radius is 5mm, and pulsewidth is 30ns and repetition rate is 20Hz; Carbon dioxide laser 4 parameter change is spot diameter is 5mm, and laser power is 6kw, and scanning speed is 1m/min and powder feeding rate is 150mg/s; Metal corrosion inhibitor particle selects the secondary magnesium phosphate of 50nm; Corrosion-resistant coating thickness after polishing is 0.4mm.
Claims (3)
1. improve a method for stainless steel weld joint erosion resistance, it is characterized in that step is as follows:
Step 1, chooses one piece with stainless steel welded of weld seam, carries out pre-treatment to it, and be fixed on three-axis numerical control worktable by good for pre-treatment stainless steel welded;
Step 2,20-50 nm metal corrosion inhibitor particle is put into powder feeder, regulate powder-feeding nozzle relative to the angle of stainless steel weld joint surface normal to 30o, determine that metal corrosion inhibitor particle injects the position in molten bath and the continuous laser distance be radiated on stainless steel weld joint between position is 5-10 mm by mobile powder-feeding nozzle;
Step 3, the Systematical control carbon dioxide laser that computerizeds control give off laser beam direct irradiation stainless steel weld joint surface, in formation temperature 1000-1500 DEG C of molten bath, stainless steel weld joint surface, interval after 3 seconds by powder-feeding nozzle to molten bath metal injection corrosion inhibitor particle, thus form the good corrosion-resistant coating of one deck compactness on the surface of stainless steel weld joint;
Step 4, carries out polishing to the corrosion-resistant coating formed, and make its smooth surface steady, reduce the surfaceness of corrosion-resistant coating, the corrosion-resistant coating thickness after polishing is greater than 0;
Step 5, flexible lamina is posted after a polish on stainless steel welded of corrosion-resistant coating, again Pulsed Laser Parameters is set according to the thickness of stainless steel welded and material behavior: pulsewidth, repetition rate, pulse energy and spot diameter, thus realizes carrying out laser impact intensified to stainless steel weld joint and whole heat-affected zone;
Described metal corrosion inhibitor particle is any one in potassium magnesium phosphate, sodium phosphate magnesium and secondary magnesium phosphate; Described metal corrosion inhibitor particle diameter size is 20-50 nm.
2. the method improving stainless steel weld joint erosion resistance as claimed in claim 1, it is characterized in that, the corrosion-resistant coating thickness after described polishing is 0.2-0.4 mm.
3. one kind is improved the method for stainless steel weld joint erosion resistance as claimed in claim 1, it is characterized in that, when carrying out laser fusion injection in described step 3, carbon dioxide laser parameter is: laser power is 3-6 kw, sweep velocity is 0.2-1.0 m/min, powder sending quantity is 60-150 mg/s, spot size is 1-5mm, when carrying out laser impact intensified in steps of 5, nanosecond laser Pulsed Laser Parameters is: pulsewidth 8-30 ns, repetition rate is 10-20 Hz, and pulse energy is 5-15 J, and spot diameter is 1-5 mm.
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| CN109136529A (en) * | 2018-10-25 | 2019-01-04 | 广东工业大学 | A kind of laser shock peening method |
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