CN104801839A - Welding technology of austenitic stainless steel and chrome molybdenum heat resistant steel - Google Patents
Welding technology of austenitic stainless steel and chrome molybdenum heat resistant steel Download PDFInfo
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- CN104801839A CN104801839A CN201510151587.0A CN201510151587A CN104801839A CN 104801839 A CN104801839 A CN 104801839A CN 201510151587 A CN201510151587 A CN 201510151587A CN 104801839 A CN104801839 A CN 104801839A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
- B23K9/232—Arc welding or cutting taking account of the properties of the materials to be welded of different metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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Abstract
The invention provides a welding technology of austenitic stainless steel and chrome molybdenum heat resistant steel. The welding technology comprises the following steps: processing before welding: processing welding ports on the butt joint surfaces of workpieces, polishing the beveled edges and truncated edges of the butt joint surfaces of workpieces, removing oil contamination on the butt joint surfaces, and removing oil contamination and oxidation film on the surfaces of a welding strip or a welding silk via organic solvent; adopting nickel-based alloy welding silk for executing overlaying treatment on chrome molybdenum heat resistant steel workpiece, adopting manual metal-arc welding or argon tungsten-arc welding for welding; after welding, adopting the air cooling gradient cooling method for cooling the welding ends; removing surface scale and floating dust on the welding ports of the butt joint surfaces, and checking whether the welding ports of the butt joint surfaces have welding problem or not. The leakage problem of connection welding line of the austenitic stainless steel and chrome molybdenum heat resistant steel is solved, ideal different steel welding joint can be obtained and the use performance of the different steel welding welded junction is greatly improved.
Description
Technical field
The present invention relates to welding technology field.More particularly, the present invention relates to there is the austenitic stainless steel of weld seam flawless excellent specific property and the welding procedure of chrome molybdenum heat resisting steel.
Background technology
The Dissimilar Steel Welded Joint that austenitic stainless steel is connected with chrome molybdenum heat resisting steel mainly considers the intercrystalline corrosion of joint, stress corrosion, high-temperature oxydation and high temperature creep property etc., require that in welding point, fused district composition will be stablized, transition zone is not obvious, so adopted the little and easy to operate manual metal-arc welding of penetration ratio just, but in hydrogen operating mode, (working media has hydrogen, at high temperature to be rich in hydrogen from) under, such as, in the synthesis loop formed at synthetic tower and the battalion road that is connected thereof, hydrogen dividing potential drop is up to more than 100bar, dissimilar steel joint in this system (or loop), the particularly xenogenesis joint that welds mutually with austenitic steel (such as A312TP321 or SB168ALLOY800H) of low-alloy steel (such as A335GR.P22), also must consider hydrogen-type corrosion problem (main manifestations is disbonding cracking in this xenogenesis joint).And at home and abroad, be no matter from design and practice of construction process, all Main Basis code requirements and not being combined in concrete use procedure because the difference worked adopts different materials and construction technology respectively.
Summary of the invention
As the result of various extensive and careful research and experiment, the present inventor has been found that, when utilizing the gradient process for cooling after specifically welding pre-treatment, welding and welding in welding procedure, contribute to the Dissimilar Steel Welded Joint weld seam flawless excellent specific property performance that raising austenitic stainless steel is connected with chrome molybdenum heat resisting steel.Based on this discovery, complete the present invention.
An object of the present invention is to solve at least the problems referred to above and/or defect, and the advantage will illustrated at least is below provided.
A further object of the invention is to provide a kind of dissimilar steel welding technology be connected with chrome molybdenum heat resisting steel for austenitic stainless steel, and it can promote the Dissimilar Steel Welded Joint weld seam flawless excellent specific property that austenitic stainless steel is connected with chrome molybdenum heat resisting steel.
A further object of the invention be by welding after air cooling gradient cooling cooling means, improve the residual stress of the Dissimilar Steel Welded Joint that austenitic stainless steel is connected with chrome molybdenum heat resisting steel, and then the efficiency of the intensity of raising Dissimilar Steel Welded Joint, to obtain better Dissimilar Steel Welded Joint.
In order to realize according to these objects of the present invention and other advantage, provide 1, the welding procedure of a kind of austenitic stainless steel and chrome molybdenum heat resisting steel, wherein, described welding procedure comprises the following steps:
Step 1, welding pre-treatment, specifically comprise:
1) soldering opening is processed to austenite stainless steel workpiece and chrome molybdenum heat resisting steel workpiece interface, described soldering opening is single V groove with root face, the bevel angle sum making described austenite stainless steel workpiece and chrome molybdenum heat resisting steel workpiece interface is 44 ~ 54 degree, and root face is 2.5 ~ 3.5mm;
2) grinding process is carried out to the groove of described austenite stainless steel workpiece and chrome molybdenum heat resisting steel workpiece interface and root face, make surface roughness be 1.0 ~ 1.8 μm, with groove and the root face of interface described in alcohol washes, remove the greasy dirt of described interface;
3) before welding implemented by use welding rod or welding wire, first the surface and oil contaminant of welding rod or welding wire is removed with machine solvent, afterwards, by the NaOH solution of 5% ~ 10%, be, under the condition of 70 DEG C, welding rod or welding wire are implemented welding immersion 30 ~ 60s in temperature, to remove the oxide-film of welding rod or welding wire surface, then, airing clean with clear water also keeps clean clean;
Step 2, employing nickel-base alloy bare welding filler metal carry out built-up welding process to described chrome molybdenum heat resisting steel workpiece, and the technological parameter of described built-up welding process is: adopt plasma arc surfacing, built-up welding dilution rate 5 ~ 15%, deposition rate 0.5 ~ 6.8kg/h, the chrome molybdenum heat resisting steel piece-holder of austenite stainless steel workpiece with heap postwelding is fixed, keep described austenite stainless steel workpiece and chrome molybdenum heat resisting steel workpiece butt welding face level, manual metal-arc welding or argon tungsten-arc welding is adopted to weld, described manual metal-arc welding floating voltage is 60 ~ 70V, argon tungsten arc process parameter is: tungsten electrode adopts Ce-W electrode, purity of argon is more than 99.98, be 35 ~ 40L/min when argon flow amount starts, during welding, flow remains on 20 ~ 25L/min welding current, 3 ~ 10A alternating current, welding arc voltage 20V ~ 30V, speed of welding 40 ~ 50mm/min,
After step 3, described austenite stainless steel workpiece have all welded with chrome molybdenum heat resisting steel workpiece interface soldering opening, the air cooling gradient method that cools is taked to be cooled by welding point, specifically comprise: the first stage: be cooled to 600 ~ 700 DEG C, cooling velocity is 180 DEG C/h, keeps temperature 2 ~ 3h; Second stage: be cooled to 500 ~ 550 DEG C, cooling velocity is 150 DEG C/h, keeps temperature 1 ~ 2h; Phase III: be cooled to 300 ~ 350 DEG C, cooling velocity is 120 DEG C/h, keeps temperature 1 ~ 2h; Fourth stage: be cooled to room temperature in air, cooling velocity is 100 DEG C/h;
Step 4, the soldering opening surface scale removing described interface and floating dust, check whether the soldering opening of described interface exists Welding Problems;
Preferably, wherein, under operating temperature is greater than the non-hydrogen operating mode of 450 DEG C, described welding rod or welding wire adopt Nickel-based Alloy Welding material.
Preferably, wherein, described Nickel-based Alloy Welding material is Inconel 82 welding wire or Inconel 182 welding rod.
Preferably, wherein, under hydrogen operating mode, described austenitic stainless steel is E309 type welding rod with the weld bond welding material welded of chrome molybdenum heat resisting steel.
Preferably, wherein, if described austenite stainless steel workpiece and chrome molybdenum heat resisting steel workpiece are duct work, also step is comprised: selection group is to tooling device between step 1 and step 2, horizontal group pair is carried out to described duct work, group is 2 ~ 3mm to gap and evenly, maintenance group is less than 2mm to the soldering opening inwall deviation completed, and outer wall deviation is less than 3mm.
Preferably, wherein, carrying out to the groove of described interface and root face the method that grinding process adopts is water mill polishing grinding method, specifically comprises: first grind off bright star with 800#-900# sand paper, then uses the light frosted trace of 1500# sand paper.
Preferably, wherein, the method removing the employing of workpiece interface soldering opening surface scale described in step 4 is specially: be placed in the KOH solution of 2% ~ 5% by interface soldering opening, at temperature is 50 DEG C, soak 30 ~ 60s.
Preferably, wherein, step 4 checks that described workpiece interface soldering opening specifically comprises: weld complete, all weld seams carry out visual examination, comprises and checks whether weld edge round and smoothly should be transitioned into mother metal; Whether face of weld exists crackle, lack of penetration, the defect such as incomplete fusion and overlap; Whether the undercut degree of depth is not more than 0.5mm, and whether undercut total length in weld seam both sides is no more than 20% of weld seam total length; Finally carry out 100%RT inspection, check whether RT is not less than JB/T4730-2005-II grade standard.
Preferably, wherein, described organic solvent is trichloro-ethylene.
The present invention at least comprises following beneficial effect:
1, owing to have employed the welding procedure of the rear air cooling gradient cooling of welding pre-treatment, arc welding and welding, it can promote the Dissimilar Steel Welded Joint weld seam flawless excellent specific property that austenitic stainless steel is connected with chrome molybdenum heat resisting steel;
2, by the air cooling gradient cooling cooling means after welding, the residual stress of the Dissimilar Steel Welded Joint that austenitic stainless steel is connected with chrome molybdenum heat resisting steel is improved, and then the efficiency of the intensity of raising Dissimilar Steel Welded Joint, obtain better Dissimilar Steel Welded Joint;
3, due to petrochemical plant 3 years will overhaul once, adopt this technique not only to obtain good welding effect to the welding petroleum chemical industry equipment of austenitic stainless steel and chrome molybdenum heat resisting steel, also significant to the prospect of process pipelines welding;
4, E309 type welding rod is selected.The performance of its intensity and resistant to hydrogen corrosion can meet technological requirement completely, and to the hydrogen system of the hydrogen-type corrosion effect split by force, E309 type welding rod is selected in welding; Good welding performance, economic effect promotes;
5, because postwelding need not carry out post weld heat treatment, shorten the construction period, saved construction cost, compared with conventional construction method, integrated construction cost can save 20-30%, and economic benefit is obvious;
6, group checks interval 100% the front blanking to pipeline, cut polishing, group, improves the efficiency of welding.
Part is embodied by explanation below by other advantage of the present invention, target and feature, part also will by research and practice of the present invention by those skilled in the art is understood.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the welding procedure of austenitic stainless steel of the present invention and chrome molybdenum heat resisting steel;
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to description word to make those skilled in the art.
Should be appreciated that used hereinly such as " to have ", other element one or more do not allotted in " comprising " and " comprising " term or the existence of its combination or interpolation.
< example 1>
Under hydrogen operating mode, austenite stainless steel plate material welds with chrome molybdenum heat resisting steel sheet material
As shown in Figure 1, concrete implementing process comprises:
Step 1, welding pre-treatment, specifically comprise:
1) soldering opening is processed to austenite stainless steel plate material and chrome molybdenum heat resisting steel sheet material interface, described soldering opening is single V groove with root face, the bevel angle sum making described austenite stainless steel plate material and chrome molybdenum heat resisting steel sheet material interface is 44 ~ 54 degree, and root face is 2.5 ~ 3.5mm;
2) grinding process is carried out to the groove of described austenite stainless steel plate material and chrome molybdenum heat resisting steel sheet material interface and root face, first grind off bright star with 800#-900# sand paper, use the light frosted trace of 1500# sand paper again, surface roughness is made to be 1.0 ~ 1.8 μm, with groove and the root face of interface described in alcohol washes, remove the greasy dirt of described interface;
3) before use weld bond welding material E309 type welding rod, first the surface and oil contaminant of welding rod or welding wire is removed with machine solvent trichlorethylene, afterwards, by the NaOH solution of 5% ~ 10%, be E309 type welding rod is implemented welding immersion 30 ~ 60s under the condition of 70 DEG C in temperature, to remove the oxide-film on E309 type welding rod surface, then, airing clean with clear water also keeps clean clean;
Step 2, employing Inconel 82 welding wire or Inconel 182 welding rod carry out built-up welding process to described chrome molybdenum heat resisting steel sheet material, and the technological parameter of described built-up welding process is: adopt plasma arc surfacing, built-up welding dilution rate 5 ~ 15%, deposition rate 0.5 ~ 6.8kg/h; The chrome molybdenum heat resisting steel sheet material of austenite stainless steel plate material with heap postwelding is gripped, keep described austenite stainless steel plate material and chrome molybdenum heat resisting steel sheet material butt welding face level, argon tungsten-arc welding is adopted to weld, argon tungsten arc process parameter is: tungsten electrode adopts Ce-W electrode, purity of argon is more than 99.98, be 35 ~ 40L/min when argon flow amount starts, during welding, flow remains on 20 ~ 25L/min welding current, 3 ~ 10A alternating current, welding arc voltage 20V ~ 30V, speed of welding 40 ~ 50mm/min;
After step 3, described austenite stainless steel plate material have all welded with chrome molybdenum heat resisting steel sheet material interface soldering opening, the air cooling gradient method that cools is taked to be cooled by welding point, specifically comprise: the first stage: be cooled to 600 ~ 700 DEG C, cooling velocity is 180 DEG C/h, keeps temperature 2 ~ 3h; Second stage: be cooled to 500 ~ 550 DEG C, cooling velocity is 150 DEG C/h, keeps temperature 1 ~ 2h; Phase III: be cooled to 300 ~ 350 DEG C, cooling velocity is 120 DEG C/h, keeps temperature 1 ~ 2h; Fourth stage: be cooled to room temperature in air, cooling velocity is 100 DEG C/h;
Step 4, interface soldering opening are placed in the KOH solution of 2% ~ 5%, at temperature is 50 DEG C, soaks 30 ~ 60s, removes soldering opening surface scale and the floating dust of described interface, weld complete, all weld seams carry out visual examination, comprise and check whether weld edge round and smoothly should be transitioned into mother metal; Whether face of weld exists crackle, lack of penetration, the defect such as incomplete fusion and overlap; Whether the undercut degree of depth is not more than 0.5mm, and whether undercut total length in weld seam both sides is no more than 20% of weld seam total length; Finally carry out 100%RT inspection, check whether RT is not less than JB/T4730-2005-II grade standard.
< example 2>
Under hydrogen operating mode, Austenitic stainless steel pipe material welds with chrome molybdenum heat resisting steel tubing
As shown in Figure 1, concrete implementing process comprises:
Step 1, welding pre-treatment, specifically comprise:
1) soldering opening is processed to Austenitic stainless steel pipe material and chrome molybdenum heat resisting steel tubing interface, described soldering opening is single V groove with root face, the bevel angle sum making described Austenitic stainless steel pipe material and chrome molybdenum heat resisting steel tubing interface is 44 ~ 54 degree, and root face is 2.5 ~ 3.5mm;
2) grinding process is carried out to the groove of described Austenitic stainless steel pipe material and chrome molybdenum heat resisting steel tubing interface and root face, first grind off bright star with 800#-900# sand paper, use the light frosted trace of 1500# sand paper again, surface roughness is made to be 1.0 ~ 1.8 μm, with groove and the root face of interface described in alcohol washes, remove the greasy dirt of described interface;
3) before use weld bond welding material E309 type welding rod, first the surface and oil contaminant of welding rod or welding wire is removed with machine solvent trichlorethylene, afterwards, by the NaOH solution of 5% ~ 10%, be E309 type welding rod is implemented welding immersion 30 ~ 60s under the condition of 70 DEG C in temperature, to remove the oxide-film on E309 type welding rod surface, then, airing clean with clear water also keeps clean clean;
4) selection group, to tooling device, carries out horizontal group pair to described tubing, and group is 2 ~ 3mm to gap and evenly, maintenance group is less than 2mm to the soldering opening inwall deviation completed, and outer wall deviation is less than 3mm;
Step 2, employing Inconel 82 welding wire or Inconel 182 welding rod carry out built-up welding process to described chrome molybdenum heat resisting steel tubing, and the technological parameter of described built-up welding process is: adopt plasma arc surfacing, built-up welding dilution rate 5 ~ 15%, deposition rate 0.5 ~ 6.8kg/h; The chrome molybdenum heat resisting steel tubing of Austenitic stainless steel pipe material with heap postwelding is gripped, keep described Austenitic stainless steel pipe material and chrome molybdenum heat resisting steel tubing butt welding face level, argon tungsten-arc welding is adopted to weld, argon tungsten arc process parameter is: tungsten electrode adopts Ce-W electrode, purity of argon is more than 99.98, be 35 ~ 40L/min when argon flow amount starts, during welding, flow remains on 20 ~ 25L/min welding current, 3 ~ 10A alternating current, welding arc voltage 20V ~ 30V, speed of welding 40 ~ 50mm/min;
After step 3, described Austenitic stainless steel pipe material have all welded with chrome molybdenum heat resisting steel tubing interface soldering opening, the air cooling gradient method that cools is taked to be cooled by welding point, specifically comprise: the first stage: be cooled to 600 ~ 700 DEG C, cooling velocity is 180 DEG C/h, keeps temperature 2 ~ 3h; Second stage: be cooled to 500 ~ 550 DEG C, cooling velocity is 150 DEG C/h, keeps temperature 1 ~ 2h: the phase III: be cooled to 300 ~ 350 DEG C, cooling velocity is 120 DEG C/h, keeps temperature 1 ~ 2h; Fourth stage: be cooled to room temperature in air, cooling velocity is 100 DEG C/h;
Step 4, interface soldering opening are placed in the KOH solution of 2% ~ 5%, at temperature is 50 DEG C, soaks 30 ~ 60s, removes soldering opening surface scale and the floating dust of described interface, weld complete, all weld seams carry out visual examination, comprise and check whether weld edge round and smoothly should be transitioned into mother metal; Whether face of weld exists crackle, lack of penetration, the defect such as incomplete fusion and overlap; Whether the undercut degree of depth is not more than 0.5mm, and whether undercut total length in weld seam both sides is no more than 20% of weld seam total length; Finally carry out 100%RT inspection, check whether RT is not less than JB/T4730-2005-II grade standard.
< example 3>....
Under operating temperature is greater than the non-hydrogen operating mode of 450 DEG C, austenite stainless steel plate material welds with chrome molybdenum heat resisting steel sheet material
As shown in Figure 1, concrete implementing process comprises:
Step 1, welding pre-treatment, specifically comprise:
1) soldering opening is processed to austenite stainless steel plate material and chrome molybdenum heat resisting steel sheet material interface, described soldering opening is single V groove with root face, the bevel angle sum making described austenite stainless steel plate material and chrome molybdenum heat resisting steel sheet material interface is 44 ~ 54 degree, and root face is 2.5 ~ 3.5mm;
2) grinding process is carried out to the groove of described austenite stainless steel plate material and chrome molybdenum heat resisting steel sheet material interface and root face, first grind off bright star with 800#-900# sand paper, use the light frosted trace of 1500# sand paper again, surface roughness is made to be 1.0 ~ 1.8 μm, with groove and the root face of interface described in alcohol washes, remove the greasy dirt of described interface;
3) before use Inconel 82 welding wire or Inconel 182 welding rod, first the surface and oil contaminant of welding rod or welding wire is removed with machine solvent trichlorethylene, afterwards, by the NaOH solution of 5% ~ 10%, be, under the condition of 70 DEG C, Inconel 82 welding wire or Inconel 1 82 welding rod are implemented welding immersion 30 ~ 60s in temperature, to remove the oxide-film on Inconel 82 welding wire or Inconel 182 welding rod surface, then, airing clean with clear water also keeps clean clean;
Step 2, employing Inconel 82 welding wire or Inconel 182 welding rod carry out built-up welding process to described chrome molybdenum heat resisting steel sheet material, and the technological parameter of described built-up welding process is: adopt plasma arc surfacing, built-up welding dilution rate 5 ~ 15%, deposition rate 0.5 ~ 6.8kg/h; The chrome molybdenum heat resisting steel sheet material of austenite stainless steel plate material with heap postwelding is gripped, keep described austenite stainless steel plate material and chrome molybdenum heat resisting steel sheet material butt welding face level, argon tungsten-arc welding is adopted to weld, argon tungsten arc process parameter is: tungsten electrode adopts Ce-W electrode, purity of argon is more than 99.98, be 35 ~ 40L/min when argon flow amount starts, during welding, flow remains on 20 ~ 25L/min welding current, 3 ~ 10A alternating current, welding arc voltage 20V ~ 30V, speed of welding 40 ~ 50mm/min;
After step 3, described austenite stainless steel plate material have all welded with chrome molybdenum heat resisting steel sheet material interface soldering opening, the air cooling gradient method that cools is taked to be cooled by welding point, specifically comprise: the first stage: be cooled to 600 ~ 700 DEG C, cooling velocity is 180 DEG C/h, keeps temperature 2 ~ 3h; Second stage: be cooled to 500 ~ 550 DEG C, cooling velocity is 150 DEG C/h, keeps temperature 1 ~ 2h; Phase III: be cooled to 300 ~ 350 DEG C, cooling velocity is 120 DEG C/h, keeps temperature 1 ~ 2h; Fourth stage: be cooled to room temperature in air, cooling velocity is 100 DEG C/h;
Step 4, interface soldering opening are placed in the KOH solution of 2% ~ 5%, at temperature is 50 DEG C, soaks 30 ~ 60s, removes soldering opening surface scale and the floating dust of described interface, weld complete, all weld seams carry out visual examination, comprise and check whether weld edge round and smoothly should be transitioned into mother metal; Whether face of weld exists crackle, lack of penetration, the defect such as incomplete fusion and overlap; Whether the undercut degree of depth is not more than 0.5mm, and whether undercut total length in weld seam both sides is no more than 20% of weld seam total length; Finally carry out 100%RT inspection, check whether RT is not less than JB/T4730-2005-II grade standard.
< embodiment 4>
Under operating temperature is greater than the non-hydrogen operating mode of 450 DEG C, Austenitic stainless steel pipe material welds with chrome molybdenum heat resisting steel tubing
As shown in Figure 1, concrete implementing process comprises:
Step 1, welding pre-treatment, specifically comprise:
1) soldering opening is processed to Austenitic stainless steel pipe material and chrome molybdenum heat resisting steel tubing interface, described soldering opening is single V groove with root face, the bevel angle sum making described Austenitic stainless steel pipe material and chrome molybdenum heat resisting steel tubing interface is 44 ~ 54 degree, and root face is 2.5 ~ 3.5mm;
2) grinding process is carried out to the groove of described Austenitic stainless steel pipe material and chrome molybdenum heat resisting steel tubing interface and root face, first grind off bright star with 800#-900# sand paper, use the light frosted trace of 1500# sand paper again, surface roughness is made to be 1.0 ~ 1.8 μm, with groove and the root face of interface described in alcohol washes, remove the greasy dirt of described interface;
3) before use Inconel 82 welding wire or Inconel 182 welding rod, first the surface and oil contaminant of welding rod or welding wire is removed with machine solvent trichlorethylene, afterwards, by the NaOH solution of 5% ~ 10%, be, under the condition of 70 DEG C, Inconel 82 welding wire or Inconel 1 82 welding rod are implemented welding immersion 30 ~ 60s in temperature, to remove the oxide-film on Inconel 82 welding wire or Inconel 182 welding rod surface, then, airing clean with clear water also keeps clean clean;
4) selection group, to tooling device, carries out horizontal group pair to described tubing, and group is 2 ~ 3mm to gap and evenly, maintenance group is less than 2mm to the soldering opening inwall deviation completed, and outer wall deviation is less than 3mm;
Step 2, employing Inconel 82 welding wire or Inconel 182 welding rod carry out built-up welding process to described chrome molybdenum heat resisting steel tubing, and the technological parameter of described built-up welding process is: adopt plasma arc surfacing, built-up welding dilution rate 5 ~ 15%, deposition rate 0.5 ~ 6.8kg/h; The chrome molybdenum heat resisting steel tubing of Austenitic stainless steel pipe material with heap postwelding is gripped, keep described Austenitic stainless steel pipe material and chrome molybdenum heat resisting steel tubing butt welding face level, argon tungsten-arc welding is adopted to weld, argon tungsten arc process parameter is: tungsten electrode adopts Ce-W electrode, purity of argon is more than 99.98, be 35 ~ 40L/min when argon flow amount starts, during welding, flow remains on 20 ~ 25L/min welding current, 3 ~ 10A alternating current, welding arc voltage 20V ~ 30V, speed of welding 40 ~ 50mm/min;
After step 3, described Austenitic stainless steel pipe material have all welded with chrome molybdenum heat resisting steel tubing interface soldering opening, the air cooling gradient method that cools is taked to be cooled by welding point, specifically comprise: the first stage: be cooled to 600 ~ 700 DEG C, cooling velocity is 180 DEG C/h, keeps temperature 2 ~ 3h; Second stage: be cooled to 500 ~ 550 DEG C, cooling velocity is 150 DEG C/h, keeps temperature 1 ~ 2h; Phase III: be cooled to 300 ~ 350 DEG C, cooling velocity is 120 DEG C/h, keeps temperature 1 ~ 2h; Fourth stage: be cooled to room temperature in air, cooling velocity is 100 DEG C/h;
Step 4, interface soldering opening are placed in the KOH solution of 2% ~ 5%, at temperature is 50 DEG C, soaks 30 ~ 60s, removes soldering opening surface scale and the floating dust of described interface, weld complete, all weld seams carry out visual examination, comprise and check whether weld edge round and smoothly should be transitioned into mother metal; Whether face of weld exists crackle, lack of penetration, the defect such as incomplete fusion and overlap; Whether the undercut degree of depth is not more than 0.5mm, and whether undercut total length in weld seam both sides is no more than 20% of weld seam total length; Finally carry out 100%RT inspection, check whether RT is not less than JB/T4730-2005-II grade standard.
Visible, the present invention is owing to have employed the welding procedure of the rear air cooling gradient cooling of welding pre-treatment, arc welding and welding, and it can promote the Dissimilar Steel Welded Joint weld seam flawless excellent specific property that austenitic stainless steel is connected with chrome molybdenum heat resisting steel; By the air cooling gradient cooling cooling means after welding, improve the residual stress of the Dissimilar Steel Welded Joint that austenitic stainless steel is connected with chrome molybdenum heat resisting steel, and then the efficiency of the intensity of raising Dissimilar Steel Welded Joint, obtain better Dissimilar Steel Welded Joint.
Although embodiment of the present invention are open as above, it is not restricted to listed in description and embodiment utilization.It can be applied to various applicable the field of the invention completely.For those skilled in the art, can easily realize other amendment.Therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.
Claims (9)
1. a welding procedure for austenitic stainless steel and chrome molybdenum heat resisting steel, wherein, described welding procedure comprises the following steps:
Step 1, welding pre-treatment, specifically comprise:
1) soldering opening is processed to austenite stainless steel workpiece and chrome molybdenum heat resisting steel workpiece interface, described soldering opening is single V groove with root face, the bevel angle sum making described austenite stainless steel workpiece and chrome molybdenum heat resisting steel workpiece interface is 44 ~ 54 degree, and root face is 2.5 ~ 3.5mm;
2) grinding process is carried out to the groove of described austenite stainless steel workpiece and chrome molybdenum heat resisting steel workpiece interface and root face, make surface roughness be 1.0 ~ 1.8 μm, with groove and the root face of interface described in alcohol washes, remove the greasy dirt of described interface;
3) before welding implemented by use welding rod or welding wire, first the surface and oil contaminant of welding rod or welding wire is removed with machine solvent, afterwards, by the NaOH solution of 5% ~ 10%, be, under the condition of 70 DEG C, welding rod or welding wire are implemented welding immersion 30 ~ 60s in temperature, to remove the oxide-film of welding rod or welding wire surface, then, airing clean with clear water also keeps clean clean;
Step 2, employing nickel-base alloy bare welding filler metal carry out built-up welding process to described chrome molybdenum heat resisting steel workpiece, and the technological parameter of described built-up welding process is: adopt plasma arc surfacing, built-up welding dilution rate 5 ~ 15%, deposition rate 0.5 ~ 6.8kg/h, the chrome molybdenum heat resisting steel piece-holder of austenite stainless steel workpiece with heap postwelding is fixed, keep described austenite stainless steel workpiece and chrome molybdenum heat resisting steel workpiece butt welding face level, manual metal-arc welding or argon tungsten-arc welding is adopted to weld, described manual metal-arc welding floating voltage is 60 ~ 70V, argon tungsten arc process parameter is: tungsten electrode adopts Ce-W electrode, purity of argon is more than 99.98, be 35 ~ 40L/min when argon flow amount starts, during welding, flow remains on 20 ~ 25L/min welding current, 3 ~ 10A alternating current, welding arc voltage 20V ~ 30V, speed of welding 40 ~ 50mm/min,
After step 3, described austenite stainless steel workpiece have all welded with chrome molybdenum heat resisting steel workpiece interface soldering opening, the air cooling gradient method that cools is taked to be cooled by welding point, specifically comprise: the first stage: be cooled to 600 ~ 700 DEG C, cooling velocity is 180 DEG C/h, keeps temperature 2 ~ 3h; Second stage: be cooled to 500 ~ 550 DEG C, cooling velocity is 150 DEG C/h, keeps temperature 1 ~ 2h; Phase III: be cooled to 300 ~ 350 DEG C, cooling velocity is 120 DEG C/h, keeps temperature 1 ~ 2h; Fourth stage: be cooled to room temperature in air, cooling velocity is 100 DEG C/h;
Step 4, the soldering opening surface scale removing described interface and floating dust, check whether the soldering opening of described interface exists Welding Problems.
2. the welding procedure of austenitic stainless steel as claimed in claim 1 and chrome molybdenum heat resisting steel, wherein, under operating temperature is greater than the non-hydrogen operating mode of 450 DEG C, described welding rod or welding wire adopt Nickel-based Alloy Welding material.
3. the welding procedure of austenitic stainless steel as claimed in claim 2 and chrome molybdenum heat resisting steel, wherein, described Nickel-based Alloy Welding material is Inconel 82 welding wire or Inconel 182 welding rod.
4. the welding procedure of austenitic stainless steel as claimed in claim 1 and chrome molybdenum heat resisting steel, wherein, under hydrogen operating mode, described austenitic stainless steel is E309 type welding rod with the weld bond welding material welded of chrome molybdenum heat resisting steel.
5. the welding procedure of austenitic stainless steel as claimed in claim 1 and chrome molybdenum heat resisting steel, wherein, if described austenite stainless steel workpiece and chrome molybdenum heat resisting steel workpiece are duct work, also step is comprised: selection group is to tooling device between step 1 and step 2, horizontal group pair is carried out to described duct work, group is 2 ~ 3mm to gap and evenly, maintenance group is less than 2mm to the soldering opening inwall deviation completed, and outer wall deviation is less than 3mm.
6. the welding procedure of austenitic stainless steel as claimed in claim 1 and chrome molybdenum heat resisting steel, wherein, carrying out to the groove of described interface and root face the method that grinding process adopts is water mill polishing grinding method, specifically comprise: first grind off bright star with 800#-900# sand paper, then use the light frosted trace of 1500# sand paper.
7. the welding procedure of austenitic stainless steel as claimed in claim 1 and chrome molybdenum heat resisting steel, wherein, the method removing the employing of workpiece interface soldering opening surface scale described in step 4 is specially: be placed in the KOH solution of 2% ~ 5% by interface soldering opening, at temperature is 50 DEG C, soak 30 ~ 60s.
8. the welding procedure of austenitic stainless steel as claimed in claim 1 and chrome molybdenum heat resisting steel, wherein, step 4 checks that described workpiece interface soldering opening specifically comprises: weld complete, all weld seams carry out visual examination, comprises and checks whether weld edge round and smoothly should be transitioned into mother metal; Whether face of weld exists crackle, lack of penetration, the defect such as incomplete fusion and overlap; Whether the undercut degree of depth is not more than 0.5mm, and whether undercut total length in weld seam both sides is no more than 20% of weld seam total length; Finally carry out 100%RT inspection, check whether RT is not less than JB/T4730-2005-II grade standard.
9. the welding procedure of austenitic stainless steel as claimed in claim 1 and chrome molybdenum heat resisting steel, wherein, described organic solvent is trichloro-ethylene.
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