CN115041785A - Manual TIG welding method based on low-alloy high-strength dissimilar steel gluing sleeving assembly - Google Patents
Manual TIG welding method based on low-alloy high-strength dissimilar steel gluing sleeving assembly Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 288
- 238000000034 method Methods 0.000 title claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 28
- 239000010959 steel Substances 0.000 title claims abstract description 28
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 17
- 239000000956 alloy Substances 0.000 title claims abstract description 17
- 238000004026 adhesive bonding Methods 0.000 title claims abstract description 16
- 230000007547 defect Effects 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000007689 inspection Methods 0.000 claims abstract description 5
- 239000006247 magnetic powder Substances 0.000 claims abstract description 5
- 238000010583 slow cooling Methods 0.000 claims abstract description 4
- 238000007711 solidification Methods 0.000 claims abstract description 4
- 230000008023 solidification Effects 0.000 claims abstract description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 24
- 239000003292 glue Substances 0.000 claims description 15
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 15
- 229910052721 tungsten Inorganic materials 0.000 claims description 15
- 239000010937 tungsten Substances 0.000 claims description 15
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 12
- GOBDOVFGDMNCFY-UHFFFAOYSA-N P(O)(O)(O)=O.[Cu]=O Chemical compound P(O)(O)(O)=O.[Cu]=O GOBDOVFGDMNCFY-UHFFFAOYSA-N 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- IADRPEYPEFONML-UHFFFAOYSA-N [Ce].[W] Chemical compound [Ce].[W] IADRPEYPEFONML-UHFFFAOYSA-N 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 239000000084 colloidal system Substances 0.000 claims description 2
- 238000010891 electric arc Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- 230000007704 transition Effects 0.000 description 1
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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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 discloses a manual TIG welding method based on a low-alloy high-strength dissimilar steel gluing sleeve assembly, which specifically comprises the following steps of: firstly, processing welding grooves of two low-alloy high-strength dissimilar steel gluing and sleeving components, and processing the welding end of a thicker welding part into a lockstitching groove form; after solidification, cleaning the inner part of the groove, the surfaces of the two sides of the groove within the range of 30mm and the welding wire without oil rust by using a steel wire brush; performing positioning welding in the groove at the contact position of the thicker welding part and the thinner welding part along the circumferential direction; adopting a left welding method to weld a thicker welding part and a thinner welding part comprehensively; immediately putting the welded test piece into a furnace with temperature for slow cooling; detecting a welding seam by adopting a magnetic powder inspection method, wherein cracks and air holes are not allowed on the surface of the welding seam; the defects such as pits, undercut and the like are observed visually. Compared with the prior art, the invention can effectively solve the problems that the high-strength dissimilar steel has poor self weldability and generates a large amount of air holes after being coated, so that a welded joint is good in forming, free of welding defects and good in mechanical property.
Description
Technical Field
The invention relates to the technical field of dissimilar steel TIG welding, in particular to a manual TIG welding method based on a low-alloy high-strength dissimilar steel gluing sleeving component.
Background
With the actual requirements of development and design of weapon industry products, a series of ultra-high strength steel materials such as 35CrMnSiA and 50SiMnVB are applied to a high-strength product welding structure, but the materials such as 35CrMnSiA and 50SiMnVB have very strong sensibility to heat and brittleness-hardness tendency, very strict requirement on heat input, high carbon equivalent, wide welding range, narrow welding current adjustment width and poor welding of the materials, which brings difficulty to welding, especially more difficulty to welding of dissimilar materials. However, in order to meet the special requirements of product performance indexes, the inner side of a cylinder made of 35CrMnSiA is coated with phosphoric acid-copper oxide inorganic glue, and then the cylinder is sleeved on a cylinder made of 50SiMnVB in a transition fit mode, and then the glue is heated, cured and welded. In the actual production process, a large amount of bubbles are generated when the phosphoric acid-copper oxide inorganic glue is solidified, reaction water is generated, a crystal substance generated by solidification is decomposed to generate crystal water when the phosphoric acid-copper oxide inorganic glue is heated at high temperature in the welding process, and the crystal water and the reaction water are accompanied with the whole welding process, so that poor welding seam forming after welding is caused, a large amount of air holes are generated at the welding seam, and even cracks are generated.
For welding of dissimilar steel sleeve components after application of phosphoric acid-copper oxide inorganic glue, no relevant TIG welding method has been provided in the prior art documents. Therefore, the manual TIG welding method for the low-alloy high-strength dissimilar steel gluing sleeve assembly, which is disclosed by the invention, has certain necessity and practicability by utilizing the TIG welding characteristics and combining the product structure characteristics.
Disclosure of Invention
In order to solve the defects, the invention aims to provide a manual TIG welding method based on a low-alloy high-strength dissimilar steel gluing sleeve assembly, which can effectively solve the technical problems of poor weldability of 35CrMnSiA and 50SiMnVB high-strength dissimilar steels, large amount of air holes and even cracks generated after gluing, ensure that a welded joint is well formed, has no welding defects and good mechanical properties, and meet the design requirements of products.
In order to achieve the purpose, the invention adopts the technical scheme that: a manual TIG welding method based on a low-alloy high-strength dissimilar steel gluing sleeving component adopts groove pre-exhausting and symmetrical, sectional, layered, alternative desoldering and temperature control to perform manual TIG welding, and specifically comprises the following steps:
step 1) processing welding grooves of two low-alloy high-strength dissimilar steel gluing and sleeving components: processing the welding end of a thicker welding part into a lock edge groove form, namely a lock bottom joint, wherein the lock bottom joint is formed by uniformly coating phosphoric acid-copper oxide inorganic glue on the inner wall of the thinner welding part along the circumferential direction, not coating glue on the inner wall within the range of 20mm away from the welding end, standing for 5min after the glue coating, sleeving the lock bottom joint on the thicker welding part until a gap of 0.4-1.2 mm is reserved between the welding end of the thinner welding part and the welding end of the thicker welding part, then processing a V-shaped groove with a slope angle of 30 degrees on one side of the contact end of the thicker welding part, processing a slope angle of 30 degrees on one side of the contact end of the thinner welding part and a root gap of 0.5-1 mm, and then standing for 30min and then performing colloid curing;
step 2) cleaning: after solidification, cleaning the inner part of the groove, the surfaces of the two sides of the groove within the range of 30mm by using a steel wire brush and the welding wire without oil rust, then polishing to remove oil stain, rust, burrs and water dirt until metal luster is exposed, and confirming that the welding part is free of defects within the range of 20 mm;
step 3), positioning and welding a thicker welding part and a thinner welding part: horizontally placing the two cleaned weldments on a roller bracket, adopting manual TIG welding, carrying out positioning welding in the groove at the contact position of the thicker weldment and the thinner weldment along the circumferential direction, respectively carrying out positioning welding on 8 points, symmetrically welding the welding points around the circle center, staggering welding beads, uniformly distributing welding seams, wherein the length of each welding seam is 3-4 mm, a cerium tungsten electrode is selected as a tungsten electrode, the diameter of the tungsten electrode is phi 2.0mm, the welding current is 100-130A, the diameter of the welding wire is 1.2mm, and the gas flow is 9-12L/min; the purity of argon is 99.99 percent; confirming that the welded seam has no crack defect;
step 4), comprehensively welding a thicker welding part and a thinner welding part: placing a blank of a workpiece to be welded on a roller wheel bracket by adopting a left welding method, equally dividing 8 sections on the surface of the blank along the circumferential direction by using a marking pen, and pairwise symmetrical with the center of a circle; sequentially and symmetrically performing manual TIG welding in a staggered manner along the clockwise direction; the roller is rotated to always enable the welding position to be in a horizontal position; the welding adopts double-layer welding, 8 sections are respectively welded on each layer, when the first layer is welded, after the arc is pressed down before each welding to perform non-wire-filling pre-welding, after the first welding seam is welded along the clockwise direction, the weldment is rotated by 180 degrees, the second welding seam is welded along the anticlockwise direction, after the second welding seam is welded, the first layer of welding seam is sequentially welded in a staggered manner, and the arc striking position is always positioned at the arc extinguishing position of the upper welding seam in the whole welding process; then, carrying out second layer welding in the same welding sequence as the first layer welding sequence; the tungsten electrode is a cerium tungsten electrode, the diameter of the tungsten electrode is phi 2.0mm, the end head of the tungsten electrode is frustum-shaped, the angle is 30 degrees, and the diameter of the smallest end is 1.1 mm; the welding is started in cold welding, the current is the upper limit value, the welding is not swung at a slow speed, each section of welding is continuously finished without stopping, the welding current is properly reduced along with the temperature rise of a welding blank, when the temperature of the blank exceeds 150 ℃, the next section of welding is carried out after the temperature of the blank is slowly reduced to 100-150 ℃, and a welding line is slowly cooled to 100-150 ℃ after the welding is finished;
step 5), slow cooling: after welding, immediately putting the welded test piece into a furnace with the temperature, wherein the furnace temperature is initial 60-80 ℃, 190 +/-10 ℃ and 6-8 h of heat preservation time, and then taking the test piece out of the furnace and air-cooling the test piece to the room temperature along with the furnace cooling to 60 ℃;
step sixthly, detection: detecting a welding seam by adopting a magnetic powder inspection method, wherein cracks and air holes are not allowed on the surface of the welding seam; no pits and undercut defects were observed visually.
Further, in the step 1), the thickness of the thin welding part 2 is 4mm, and the thickness of the thick welding part 1 is 3 to 5 times of the thickness of the thin welding part 2.
In the wire-filling-free preheating welding procedure in the step 4), the gas flow is 9L/min-12L/min, and the argon purity is 99.99%; the welding current is 100A-120A, and the direct current is connected positively; performing first-layer welding by TIG welding, wherein the welding wire is H18CrMoA, the diameter of the welding wire is phi 1.2mm, the gas flow is 9L/min-12L/min, and the argon purity is 99.99%; the welding current is 100A-120A, and the direct current is connected positively; performing second-layer welding by adopting TIG welding, wherein H18CrMoA is selected as a welding wire, the diameter of the welding wire is phi 1.2mm, the gas flow is 9L/min-12L/min, and the argon purity is 99.99%; the welding current is 130A-140A, and the direct current is positive; the welding seam allowance after welding is 0.5 mm-1.0 mm.
The invention has the beneficial effects that: the advantages of TIG welding are fully exerted, reasonable low-intensity matching is achieved, good fusion of the welding seams of 50SiMnVB and 35CrMnSiA steel can be guaranteed, no crack defect is found in the welding seams and a heat affected zone through magnetic powder inspection, and the welding seams are well formed.
The method reasonably selects small linear energy input, adopts the steps of pre-grooving and exhausting, symmetrical subsection and layering staggered welding, slowly cooling a welding blank and controlling the width of a heat affected zone and the temperature before, after and between layers of a welding seam, so that the defects of air holes and cracks of the welding seam caused by the phosphoric acid-copper oxide inorganic adhesive tape can be avoided, and a high-quality welding seam is obtained.
The method is suitable for manual TIG welding of low-alloy high-strength dissimilar steel gluing and sleeving, and can be popularized to TIG welding of low-alloy steel high-strength dissimilar steel butt joint, TIG welding of low-alloy high-strength steel with unequal wall thickness and the like.
Drawings
The technical features of the present invention will be further described with reference to the accompanying drawings and embodiments.
Fig. 1 is a schematic view of a thicker weld of 50 simvb material and a thinner weld of 35CrMnSiA material as welded.
In the attached figure 1, 1 is a thicker welding part made of 50SiMnVB, 2 is a thinner welding part made of 35CrMnSiA, and 3 is a welding seam.
Detailed Description
Referring to the accompanying drawing 1, the embodiment of the invention discloses a manual TIG welding method based on a low-alloy high-strength dissimilar steel gluing sleeving assembly, the embodiment is based on TIG welding of a joint of a dissimilar steel sleeving assembly with low-alloy high-strength steel of 35CrMnSiA and 50SiMnVB, manual TIG welding is carried out by adopting groove pre-exhausting and symmetrical subsection layered alternative back-welding temperature control, and the welding method is realized by the following steps:
step 1) processing a welding groove of a 50SiMnVB thick welding piece 1 and a 35CrMnSiA thin welding piece 2: processing the welding end of a thicker welding part 1 into a form of an edge locking groove, namely a bottom locking joint, wherein the bottom locking joint is formed by uniformly coating phosphoric acid-copper oxide inorganic glue on the inner wall of a thinner welding part 2 along the circumferential direction, not coating glue on the inner wall within a range of 20mm away from the welding end, standing for 5min after the glue coating, sleeving the bottom locking joint on the thicker welding part 1 until a gap of 0.4-1.2 mm is reserved between the welding end of the thinner welding part 2 and the welding end of the thicker welding part 1, processing a slope angle on one side of the contact end of the thicker welding part 1 to form a V-shaped groove with a slope angle of 30 degrees and a root gap of 0.5-1 mm on one side of the contact end of the thinner welding part 2, and then standing for 30min and then carrying out glue body curing;
step 2) cleaning: cleaning the surface in the groove and in the range of 30mm on two sides of the groove by using a steel wire, wherein the welding wire is free from oil rust, polishing to remove dirt such as oil stain, iron rust, burrs and the like until metal luster is exposed, and determining that the welding part is free from defects in the range of 20 mm;
step 3), positioning and welding a thicker welding part 1 and a thinner welding part 2: horizontally placing the cleaned workpiece to be welded on a roller bracket, adopting manual TIG welding, carrying out positioning welding along the circumferential direction in a slope at the contact part of a thicker welding part 1 and a thinner welding part 2, respectively carrying out positioning welding for 8 points, symmetrically welding the welding points by using the circle centers, staggering welding beads, uniformly distributing welding seams, wherein the length of each welding seam is 3-4 mm, selecting a cerium tungsten electrode as a tungsten electrode, the diameter of the tungsten electrode is phi 2.0mm, the welding current is 100-130A, the diameter of the welding wire is 1.2mm, the grade of the welding wire is H18CrMoA, and the gas flow is 9-12L/min; the purity of argon is 99.99 percent; confirming that the welded seam has no defects such as pores, cracks and the like;
step 4), comprehensively welding a thicker welding part 1 and a thinner welding part 2: adopting a left welding method; placing a blank to be welded on a roller wheel bracket, uniformly dividing 8 sections on the surface of the blank along the circumferential direction by using a marking pen, and making the two sections symmetrical with each other in the center of a circle; sequentially and symmetrically performing manual TIG welding in a staggered manner along the clockwise direction; the roller is rotated to always enable the welding position to be in a horizontal position; the welding adopts double-layer welding, each layer is respectively welded with 8 sections, when the first layer is welded, low electric arc is firstly pressed before each welding to carry out wire-filling preheating welding, the gas flow is 9L/min-12L/min, and the argon purity is 99.99 percent; the welding current is 100A-120A, and the direct current is connected positively; after a first welding seam is welded in the clockwise direction, rotating the weldment for 180 degrees, welding a second welding seam in the anticlockwise direction, and after the second welding seam is welded, sequentially and alternately welding to finish a first layer of welding seam, wherein the arc starting position is always positioned at the arc extinguishing position of the upper welding seam in the whole welding process, the welding wire is H18CrMoA, the diameter of the welding wire is phi 1.2mm, the gas flow is 9L/min-12L/min, the argon purity is 99.99%, the welding current is 100A-120A, and the welding wire is in direct current positive connection; then, second layer welding is carried out, the welding sequence is the same as that of the first layer welding, H18CrMoA is adopted as the welding wire, the diameter of the welding wire is phi 1.2mm, the gas flow is 9L/min-12L/min, and the argon purity is 99.99%; the welding current is 130A-140A, and the direct current is positive; the welding seam allowance after welding is 0.5 mm-1.0 mm. The tungsten electrode is a cerium tungsten electrode, the diameter of the tungsten electrode is phi 2.0mm, the end head of the tungsten electrode is frustum-shaped, the angle is 30 degrees, and the diameter of the smallest end is 1.1 mm; the welding is started in cold welding, the current is the upper limit value, the welding is not swung at a slow speed, each section of welding is continuously finished without stopping, the welding current can be properly reduced along with the temperature rise of a welding blank, when the temperature of the blank exceeds 150 ℃, the next section of welding is carried out after the temperature of the blank is slowly reduced to 100-150 ℃, and a welding line is slowly cooled to 100-150 ℃ after the welding is finished;
step 5), slow cooling: after welding, immediately putting the welded test piece into a furnace with the temperature, wherein the furnace temperature is initial 60-80 ℃, 190 +/-10 ℃ and 6-8 h of heat preservation time, and then taking the test piece out of the furnace and air-cooling the test piece to the room temperature along with the furnace cooling to 60 ℃;
step 6), detection: detecting a welding seam by adopting a magnetic powder inspection method, wherein cracks and air holes are not allowed on the surface of the welding seam; the defects such as pits, undercut and the like are observed visually.
The embodiment stabilizes the welding quality of the product, avoids the influence of a phosphoric acid-copper oxide adhesive on the performance of a welding joint, and meets the requirements of the product on the aspects of manufacture, transportation, storage, safe use and the like.
The foregoing is merely an illustrative embodiment of the present application, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present application, and such improvements and modifications should also be considered as within the scope of the present application.
Claims (3)
1. A manual TIG welding method based on a low-alloy high-strength dissimilar steel gluing sleeving component adopts groove pre-exhausting and symmetrical, sectional, layered, alternative desoldering and temperature control to perform manual TIG welding, and is characterized by comprising the following steps of:
step 1) processing welding grooves of two low-alloy high-strength dissimilar steel gluing and sleeving components: processing the welding end of a thicker welding part into a lock edge groove form, namely a lock bottom joint, wherein the lock bottom joint is formed by uniformly coating phosphoric acid-copper oxide inorganic glue on the inner wall of the thinner welding part along the circumferential direction, not coating glue on the inner wall within the range of 20mm away from the welding end, standing for 5min after the glue coating, sleeving the lock bottom joint on the thicker welding part until a gap of 0.4-1.2 mm is reserved between the welding end of the thinner welding part and the welding end of the thicker welding part, then processing a V-shaped groove with a slope angle of 30 degrees on one side of the contact end of the thicker welding part, processing a slope angle of 30 degrees on one side of the contact end of the thinner welding part and a root gap of 0.5-1 mm, and then standing for 30min and then performing colloid curing;
step 2) cleaning: after solidification, cleaning the surface of the inside of the groove and the two sides of the groove within the range of 30mm by using a steel wire brush and removing oil stain, iron rust, burrs and water dirt of the welding wire, polishing and removing the oil stain, the iron rust, the burrs and the water dirt until the metal luster is exposed, and determining that the welding part has no defect within the range of 20 mm;
step 3), positioning and welding a thicker welding part and a thinner welding part: horizontally placing the two cleaned weldments on a roller bracket, adopting manual TIG welding, carrying out positioning welding in the groove at the contact position of the thicker weldment and the thinner weldment along the circumferential direction, respectively carrying out positioning welding on 8 points, symmetrically welding the welding points around the circle center, staggering welding beads, uniformly distributing welding seams, wherein the length of each welding seam is 3-4 mm, a cerium tungsten electrode is selected as a tungsten electrode, the diameter of the tungsten electrode is phi 2.0mm, the welding current is 100-130A, the diameter of the welding wire is 1.2mm, and the gas flow is 9-12L/min; the purity of argon is 99.99 percent; confirming that the welded seam has no crack defect;
step 4), comprehensively welding a thicker welding part and a thinner welding part: placing a blank to be welded on a roller wheel bracket by adopting a left welding method, uniformly dividing 8 sections on the surface of the blank along the circumferential direction by using a marking pen, and symmetry every two of the sections with the circle center; sequentially and symmetrically performing manual TIG welding in a staggered manner along the clockwise direction; the roller is rotated to always enable the welding position to be in a horizontal position; the welding adopts double-layer welding, 8 sections are welded on each layer respectively, when the first layer is welded, the electric arc is firstly reduced before each welding to perform non-wire-filling pre-welding, after the first welding seam is welded along the clockwise direction, a weldment is rotated by 180 degrees, the second welding seam is welded along the anticlockwise direction, after the second welding seam is welded, the first layer of welding seam is sequentially welded in a staggered manner, and the arc striking position is ensured to be always positioned at the arc extinguishing position of the upper welding seam in the whole welding process; then, carrying out second layer welding in the same welding sequence as the first layer welding sequence; the tungsten electrode is a cerium tungsten electrode, the diameter of the tungsten electrode is phi 2.0mm, the end head of the tungsten electrode is frustum-shaped, the angle is 30 degrees, and the diameter of the smallest end is 1.1 mm; the welding is started in cold welding, the current is the upper limit value, the welding is not swung at a slow speed, each section of welding is continuously finished without stopping, the welding current is properly reduced along with the temperature rise of a welding blank, when the temperature of the blank exceeds 150 ℃, the next section of welding is carried out after the temperature of the blank is slowly reduced to 100-150 ℃, and a welding line is slowly cooled to 100-150 ℃ after the welding is finished;
step 5), slow cooling: after welding, immediately putting the welded test piece into a furnace with the temperature, wherein the furnace temperature is initial 60-80 ℃, 190 +/-10 ℃ and 6-8 h of heat preservation time, and then taking the test piece out of the furnace and air-cooling the test piece to the room temperature along with the furnace cooling to 60 ℃;
step 6), detection: detecting a welding seam by adopting a magnetic powder inspection method, wherein cracks and air holes are not allowed on the surface of the welding seam; no pits and undercut defects were observed visually.
2. The manual TIG welding method based on the low-alloy high-strength dissimilar steel gluing sleeving component according to claim 1, is characterized in that: in the step 1), the thickness of the thinner welding part 2 is 4mm, and the thickness of the thicker welding part 1 is 3-5 times of the thickness of the thinner welding part 2.
3. The manual TIG welding method based on the low-alloy high-strength dissimilar steel gluing sleeving component according to claim 1, is characterized in that: in the wire-filling-free preheating welding procedure in the step 4), the gas flow is 9L/min-12L/min, and the argon purity is 99.99%; the welding current is 100A-120A, and the direct current is connected positively; performing first-layer welding by TIG welding, wherein H18CrMoA is selected as a welding wire, the diameter of the welding wire is phi 1.2mm, the gas flow is 9-12L/min, and the argon purity is 99.99%; the welding current is 100A-120A, and the direct current is connected positively; performing second-layer welding by adopting TIG welding, wherein H18CrMoA is selected as a welding wire, the diameter of the welding wire is phi 1.2mm, the gas flow is 9L/min-12L/min, and the argon purity is 99.99%; the welding current is 130A-140A, and the direct current is positive; the welding seam allowance after welding is 0.5 mm-1.0 mm.
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