CN103949783A - Welding method of maritime crane barrel neck opening - Google Patents
Welding method of maritime crane barrel neck opening Download PDFInfo
- Publication number
- CN103949783A CN103949783A CN201410120661.8A CN201410120661A CN103949783A CN 103949783 A CN103949783 A CN 103949783A CN 201410120661 A CN201410120661 A CN 201410120661A CN 103949783 A CN103949783 A CN 103949783A
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- 238000003466 welding Methods 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000002093 peripheral effect Effects 0.000 claims abstract description 12
- 238000000465 moulding Methods 0.000 claims description 46
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 241000538562 Banjos Species 0.000 claims description 3
- 101100008048 Caenorhabditis elegans cut-4 gene Proteins 0.000 claims description 3
- 238000009499 grossing Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 abstract 2
- 238000003754 machining Methods 0.000 abstract 1
- 238000012795 verification Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 239000011324 bead Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a welding method of a maritime crane barrel neck opening. The welding method comprises the following steps: welding a rolling passage plate, welding an annular plate assembly, welding an annular plate assembly and a rolling passage plate, welding a box body structure and a peripheral plate, welding a lower cone, and finally folding the box body structure and a cone. The welding method has the advantages that the maritime crane barrel neck opening is manufactured according to the welding method strictly through repeated verifications of a plurality of items, so that the allowance can be effectively reduced, the welding workload is reduced, the machining workload is reduced, the deformation of the barrel neck opening can be well controlled, the qualified rate of finished products is improved, and the welding method is beneficial to popularization.
Description
Technical field
The present invention relates to welding deformation controlling method, be specifically related to the welding method of extra large work crane large scale cylindrical shell neckline.
Background technology
Marine energy more and more receives global concern, and the emergence of extra large work crane is pursued.But because extra large work crane cylindrical shell collar structure material is special, select high-strength steel S690 material, add size larger, in its welding process, be out of shape waywardly, increased the workload of welding, and qualification rate is low, is unfavorable for promoting.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of welding method that can effectively control extra large work crane tube structure distortion.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
The welding method of sea work crane cylindrical shell neckline, comprises the following steps: welding equipment raceway plate, welding equipment ring flat-plate assembly, welding equipment ring flat-plate assembly and raceway plate, welding equipment body structure and peripheral board and welding equipment bottom cone, finally close up body structure and cone.
Wherein, welding equipment raceway plate comprises the following steps:
1) moulding bed of making raceway plate welding equipment, winches to moulding bed by five sections of raceway plates, location;
2) five pieces of raceway plate junction are carried out to backstep simultaneously: first weld 2/3 of piece inner side, then in outside back chipping, inspection, then weld piece outside, finally weld 1/3 of piece inner side remainder;
3) checking measurements, confirm after the quality of above-mentioned each weld seam, mark cross centre line and the horizontal datum of raceway plate.
Welding equipment ring flat-plate assembly, point eight sections of splicings, every section contain upper and lower two-layer ring flat-plate and between dividing plate, ring flat-plate is divided into inner ring plate and outer ring plate, it comprises the following steps:
1) moulding bed of making ring flat-plate assembly and raceway plate welding equipment, winches to moulding bed by ring flat-plate;
2) to inner ring plate and the outer ring plate misalignment 200mm positioning splicing of each layer;
3) weld the seam between all inner ring plates and outer ring plate: cushioning iron plate under seam, first burn-on layer above inner ring plate and lower floor's inner ring plate below seam, relocate the seam below layer inner ring plate of burn-oning and above lower floor's inner ring plate, does not weld the 48-52mm position at seam both ends, and postwelding is smoothed with mechanical means;
4) the upper and lower two-layer ring lining out after smoothing, installs dividing plate;
5) repeating step 2) ~ step 4), until eight sections all welded.
Welding equipment ring flat-plate assembly and raceway plate comprise the following steps:
1) moulding bed of making ring flat-plate assembly and raceway plate welding equipment, on moulding bed, locate successively raceway plate and each section of ring flat-plate assembly, tack welding is in outside, final stage ring flat-plate assembly cutting surplus is held groove successfully and is relocated, and raceway plate is concentric with the circle of moulding bed bottom line, ovality is less than 6, and the surplus of inner ring meets machined requirement;
2) the joint angle weld seam of each section of ring flat-plate assembly in whole circumference and raceway plate is welded simultaneously: every section of ring flat-plate divides at least two sections to weld in circumferential direction, i.e. welding from the middle to both ends, does not weld 48-52mm position, two ends; The welding of upper and lower ring flat-plate and raceway plate is staggered carrying out also, first weld lower ring plate inner side 2/3, the ring flat-plate inner side 2/3 of burn-oning again after standing up, and carry out back chipping and the back welding in lower ring plate outside, after standing up again, carry out back chipping and back welding and the remaining welding job in lower ring plate inner side in upper ring plate outside, then stand up the remaining welding job in rear welding upper ring plate inner side;
3) symmetrical welding equipment of carrying out the banjo fixing butt jointing between levels ring flat-plate on moulding bed, tack welding is in outside, and first weld inner side, upper and lower inside and outside staggered welding, with step 2), it is the ceramic substrate of 140-160mm that the internal orifice of the two ends of inner ring plate abutted seam and outer ring plate abutted seam all adopts length;
4) after 72 hours, measure the inspection distortion of above-mentioned box-structure and the welding quality of weld seam.
Welding equipment box-structure and peripheral board comprise the following steps:
1) in the outside of box-structure, peripheral board is installed, cut 4 interim manholes and 4 place's gutter channels, manhole is mended plate and is carried out direction, mark, holds groove successfully, after internal work finishes, envelope is mended, after 3 interim manhole inner sides weld, outside back chipping back welding, last remaining interim manhole outside weldering, double-faced forming;
2) measure, check, again carry out the mark of cross centre line and horizontal datum, upper box body structure welding completes;
Welding equipment bottom cone comprises the following steps:
1) make the assembled moulding bed of cone, locate and fix five blocks of cone plates successively counter making on moulding bed, between cone plate, the gap of piece is not more than 2mm, the poor 2mm that is less than of edges of boards, angularity deviation 2mm;
2) first weld piece inner side, short transverse is divided at least three sections of backstep weldings, and after inner side weldering 2/3, outside back chipping, welding, be finally soldered the remaining work in inner side;
3) according to installing after actual measured results cutting surplus, locating the 6th block of cone plate, piece welding requirements is with reference to step 2);
4) postwelding measurement cone is suitable for reading descending up with end opening, pulls cross centre line and horizontal datum, and carries out visible marking.
Close up body structure and cone comprises the following steps:
1) upper box body structure is made on moulding bed according to the cross centre line pulling and horizontal datum location counter;
2) by bottom cone and the concentric locating of upper box body structure to horizontal level;
3) abutment joint of raceway plate in welding equipment cone and body structure, tack welding, in inner side, adopts many people subregion to weld simultaneously, first welds the outer side weld of abutment joint, and back welding after inner side polishing back chipping, completes whole anti-welding of making cylindrical shell neckline;
4) postwelding is measured, and marks center line and the horizontal datum of cylindrical shell collar structure according to moulding bed bottom line, and carries out visible marking, is the cylindrical shell neckline of extra large work crane after integrated overturn.
Advantage of the present invention is: repeatedly verify through multiple projects, the cylindrical shell neckline of extra large work crane is made in strict accordance with this welding method, can effectively reduce surplus, reduce welding job amount, reduce machined workload, can well control the distortion of cylindrical shell neckline, the qualification rate that has improved finished product, is beneficial to popularization.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is raceway plate moulding bed position view in the present invention;
Fig. 2 is backstep welding bead distribution schematic diagram in the present invention;
Fig. 3 is ring flat-plate assembly moulding bed position view in the present invention;
Fig. 4 is the structural representation of ring flat-plate assembly in the present invention;
Fig. 5 is ring flat-plate assembly and raceway plate moulding bed position view in the present invention;
Fig. 6 is ring flat-plate assembly and raceway plate welding profile in the present invention;
Fig. 7 is the present invention China and foreign countries ring flat-plate end connector ruggedized construction schematic diagrames;
Fig. 8 is the structure for amplifying schematic diagram of ceramic substrate position in the present invention;
Fig. 9 is box-structure and peripheral board positional structure schematic diagram in the present invention;
Figure 10 is the assembled moulding bed position view of cone in the present invention;
Figure 11 is cone structure schematic diagram in the present invention;
Figure 12 is the anti-cylindrical shell collar structure schematic diagram of making in the present invention;
Figure 13 is peripheral board structural representation in the present invention;
Figure 14 is middle cylinder body collar structure schematic diagram of the present invention.
Wherein, 1, raceway plate, 101, the moulding bed of raceway plate welding equipment, 102, piece between raceway plate, 103, welding bead, 2, ring flat-plate assembly, 201, inner ring plate, 202, outer ring plate, 203, the moulding bed of ring flat-plate assembly welding equipment, 211, weld seam, 3, dividing plate, 4, the moulding bed of ring flat-plate assembly and raceway plate welding equipment, 5, δ 25 plates, 501, bolt, 6, ceramic substrate, 7, peripheral board, 8, box-structure, 9, the moulding bed that cone is assembled, 10, annular moulding bed, 11, cone, 111, cone plate, 12, body structure, 13, gutter channel, A, the inner side of piece, B, the outside of piece.
Detailed description of the invention:
The welding method of sea work crane cylindrical shell neckline, comprises the following steps:
A, welding equipment raceway plate 1:
1) as shown in Figure 1, make the moulding bed 101 of raceway plate welding equipment, five sections of raceway plates are winched to moulding bed, location, ensures that plus tolerance is 10160
;
2) the high 1260mm of raceway plate 1, in welding process, easily form cone, for ensureing that upper and lower linearity is less than 2, need carry out backstep to five pieces 102 of raceway plate 1 junction simultaneously, divide three sections or more, tack welding is in outside, use round steel transition, the upper and lower side of piece 102 installs additional and draws, arc-extinguishing plate, as shown in Figure 2: first weld 2/3 of piece 102 inner side A, then at outside B back chipping, check, weld again piece 102 outside B, finally weld 1/3 of piece 102 inner side A remainders, alternately inside and outside, once complete whole welding jobs, and check the angularity of piece 102 with model at any time, the workload of external welding in adjusting in time, the joint of every layer of welding bead 103 staggers, spacing is greater than 25mm, stepped,
3) checking measurements, confirm after the quality of above-mentioned each weld seam, mark cross centre line and the horizontal datum of raceway plate.
B, welding equipment ring flat-plate assembly 2, point eight sections of splicings, every section contain upper and lower two-layer ring flat-plate and between dividing plate 3, ring flat-plate is divided into inner ring plate 201 and outer ring plate 202:
1) as shown in Figure 3, make the moulding bed 203 of ring flat-plate assembly 2 and raceway plate 1 welding equipment, ring flat-plate is winched to moulding bed 203;
2) as shown in Figure 4, to the inner ring plate 201 and outer ring plate 202 misalignment 200mm positioning splicings of each layer;
3) weld the seam between all inner ring plates 201 and outer ring plate 202: cushioning iron plate under seam, first burn-on layer above inner ring plate and lower floor's inner ring plate below seam, relocate the seam below layer inner ring plate of burn-oning and above lower floor's inner ring plate, does not weld the 48-52mm position at seam both ends, and postwelding is smoothed with mechanical means;
4) the upper and lower two-layer ring lining out after smoothing, installs dividing plate 3;
5) repeating step 2) ~ step 4), until eight sections all welded.
C, welding equipment ring flat-plate assembly 2 and raceway plate 1:
1) as shown in Figure 5, make the moulding bed 4 of ring flat-plate assembly 2 and raceway plate 1 welding equipment, on moulding bed 4, locate successively raceway plate 1 and each section of ring flat-plate assembly 2, tack welding is in outside, final stage ring flat-plate assembly 2 cuts surplus, hold groove successfully relocates, and raceway plate 1 is concentric with the circle of moulding bed 4 bottom lines, and ovality is less than 6, the surplus of inner ring meets machined requirement;
2) each section of ring flat-plate assembly 2 in whole circumference welded with the joint angle weld seam of raceway plate 1 simultaneously: every section of ring flat-plate divides at least two sections to weld in circumferential direction, i.e. welding from the middle to both ends; The welding of upper and lower ring flat-plate and raceway plate 1 is staggered carrying out also, as shown in Figure 6: first weld lower ring plate inner side 2/3, the ring flat-plate inner side 2/3 of burn-oning again after standing up, and carry out back chipping and the back welding in lower ring plate outside, after standing up again, carry out back chipping and back welding and the remaining welding job in lower ring plate inner side in upper ring plate outside, stand up again the remaining welding job in rear welding upper ring plate inner side, wherein: does not weld 48-52mm position, every section of ring flat-plate two ends, the capping layer of each side welding adopts normalizing pass, and the joint of each layer of welding bead staggers and is no less than 25mm; As shown in Figure 7,16 end connectors that stand up front levels outer ring plate 202 add δ 25 plates 5 to be fixed, and unclamps bolt 501 after standing up, and before standing up next time, tightens again; Because insert space is narrow and small, preheat temperature is higher, and does not allow to blow a cold wind over, and need take certain safety prevention measure;
3) symmetrical welding equipment of carrying out the banjo fixing butt jointing between levels ring flat-plate on moulding bed 4, tack welding is in outside, inner side is weldering first, upper and lower inside and outside staggered welding, with step 2), it is the ceramic substrate 6 of 140-160mm that the internal orifice of the two ends of inner ring plate 201 abutted seams and outer ring plate 202 abutted seams all adopts length, as shown in Figure 8; The abutted seam of same place inner and outer ring requires one-time continuous to complete, and does not pause midway, and inside and outside standing up while alternately welding still needs to do necessary reinforcement, after standing up, needn't remove;
4) after 72 hours, measure the inspection distortion of above-mentioned box-structure 8 and the welding quality of weld seam.
D, welding equipment box-structure 8 and peripheral board 7, as shown in Figure 9:
1) in the outside of box-structure 8, peripheral board 7 is installed, cut 4 interim manholes and 4 place's gutter channels, as shown in figure 13, manhole is mended plate and is carried out direction, mark, holds groove successfully, after internal work finishes, envelope is mended, after 3 interim manhole inner sides weld, and outside back chipping back welding, last remaining interim manhole outside weldering, double-faced forming;
2) measure, check, again carry out the mark of cross centre line and horizontal datum, upper box body structure 12 has been welded.
E, welding equipment bottom cone 10:
1) as shown in figure 10, make the assembled moulding bed 9 of cone 10, annular moulding bed 10 uses angle steel to fix, and locates and fixes five blocks of cone plates 111 successively counter making on moulding bed, and the gap of 111 pieces of cone plate is not more than 2mm, the poor 2mm that is less than of edges of boards, angularity deviation 2mm;
2) first weld piece inner side, short transverse is divided at least three sections of backstep weldings, and after inner side weldering 2/3, outside back chipping, welding, be finally soldered the remaining work in inner side;
3) according to installing after actual measured results cutting surplus, the 6th block of cone plate in location, piece welding requirements is with reference to step 2), after welding as shown in figure 11;
4) postwelding measurement cone 11 is suitable for reading descending up with end opening, pulls cross centre line and horizontal datum, and carries out visible marking.
F, close up body structure 12 and cone 11, as shown in figure 12:
1) upper box body structure 12 is made on moulding bed according to the cross centre line pulling and horizontal datum location counter;
2) by bottom cone 11 with 12 concentric locatings of upper box body structure to horizontal level;
3) abutment joint of raceway plate 1 in welding equipment cone 11 and body structure 12, tack welding is in inner side, adopt many people subregion to weld simultaneously, first weld the outer side weld of abutment joint, back welding after inner side polishing back chipping adopt many people subregion to weld, and one-time continuous completes when welding simultaneously, without pausing, complete whole anti-welding of making cylindrical shell neckline midway;
4) postwelding is measured, and marks center line and the horizontal datum of cylindrical shell collar structure according to moulding bed bottom line, and carries out visible marking, is the cylindrical shell neckline of extra large work crane, as shown in figure 14 after integrated overturn.
Claims (7)
1. the welding method of extra large work crane cylindrical shell neckline, it is characterized in that: comprise the following steps: welding equipment raceway plate, welding equipment ring flat-plate assembly, welding equipment ring flat-plate assembly and raceway plate, welding equipment box-structure and peripheral board and welding equipment bottom cone, finally close up body structure and cone.
2. the welding method of extra large work crane cylindrical shell neckline according to claim 1, is characterized in that: described welding equipment raceway plate comprises the following steps:
1) moulding bed of making raceway plate welding equipment, winches to moulding bed by five sections of raceway plates, location;
2) five pieces of raceway plate junction are carried out to backstep simultaneously: first weld 2/3 of piece inner side, then in outside back chipping, inspection, then weld piece outside, finally weld 1/3 of piece inner side remainder;
3) checking measurements, confirm after the quality of above-mentioned each weld seam, mark cross centre line and the horizontal datum of raceway plate.
3. the welding method of extra large work crane cylindrical shell neckline according to claim 1, it is characterized in that: described welding equipment ring flat-plate assembly divides eight sections of splicings, every section contain upper and lower two-layer ring flat-plate and between dividing plate, ring flat-plate is divided into inner ring plate and outer ring plate, it comprises the following steps:
1) moulding bed of making ring flat-plate assembly and raceway plate welding equipment, winches to moulding bed by ring flat-plate;
2) to inner ring plate and the outer ring plate misalignment 200mm positioning splicing of each layer;
3) weld the seam between all inner ring plates and outer ring plate: cushioning iron plate under seam, first burn-on layer above inner ring plate and lower floor's inner ring plate below seam, relocate the seam below layer inner ring plate of burn-oning and above lower floor's inner ring plate, does not weld the 48-52mm position at seam both ends, and postwelding is smoothed with mechanical means;
4) the upper and lower two-layer ring lining out after smoothing, installs dividing plate;
5) repeating step 2) ~ step 4), until eight sections all welded.
4. the welding method of extra large work crane cylindrical shell neckline according to claim 1, is characterized in that: described welding equipment ring flat-plate assembly comprises the following steps:
1) moulding bed of making ring flat-plate assembly welding equipment, on moulding bed, locate successively raceway plate and each section of ring flat-plate assembly, tack welding is in outside, final stage ring flat-plate assembly cutting surplus is held groove successfully and is relocated, and raceway plate is concentric with the circle of moulding bed bottom line, ovality is less than 6, and the surplus of inner ring meets machined requirement;
2) the joint angle weld seam of each section of ring flat-plate assembly in whole circumference and raceway plate is welded simultaneously: every section of ring flat-plate divides at least two sections to weld in circumferential direction, i.e. welding from the middle to both ends, does not weld 48-52mm position, two ends; The welding of upper and lower ring flat-plate and raceway plate is staggered carrying out also, first weld lower ring plate inner side 2/3, the ring flat-plate inner side 2/3 of burn-oning again after standing up, and carry out back chipping and the back welding in lower ring plate outside, after standing up again, carry out back chipping and back welding and the remaining welding job in lower ring plate inner side in upper ring plate outside, then stand up the remaining welding job in rear welding upper ring plate inner side;
3) symmetrical welding equipment of carrying out the banjo fixing butt jointing between levels ring flat-plate on moulding bed, tack welding is in outside, and first weld inner side, upper and lower inside and outside staggered welding, with step 2), it is the ceramic substrate of 140-160mm that the internal orifice of the two ends of inner ring plate abutted seam and outer ring plate abutted seam all adopts length;
4) after 72 hours, measure the inspection distortion of above-mentioned box-structure and the welding quality of weld seam.
5. the welding method of extra large work crane cylindrical shell neckline according to claim 1, is characterized in that: described welding equipment box-structure and peripheral board comprise the following steps:
1) in the outside of box-structure, peripheral board is installed, cut 4 interim manholes and 4 place's gutter channels, manhole is mended plate and is carried out direction, mark, holds groove successfully, after internal work finishes, envelope is mended, after 3 interim manhole inner sides weld, outside back chipping back welding, last remaining interim manhole outside weldering, double-faced forming;
2) measure, check, again carry out the mark of cross centre line and horizontal datum, upper box body structure welding completes.
6. the welding method of extra large work crane cylindrical shell neckline according to claim 1, is characterized in that: described welding equipment bottom cone comprises the following steps:
1) make the assembled moulding bed of cone, locate and fix five blocks of cone plates successively counter making on moulding bed, between cone plate, the gap of piece is not more than 2mm, the poor 2mm that is less than of edges of boards, angularity deviation 2mm;
2) first weld piece inner side, short transverse is divided at least three sections of backstep weldings, and after inner side weldering 2/3, outside back chipping, welding, be finally soldered the remaining work in inner side;
3) according to installing after actual measured results cutting surplus, locating the 6th block of cone plate, piece welding requirements is with reference to step 2);
4) postwelding measurement cone is suitable for reading descending up with end opening, pulls cross centre line and horizontal datum, and carries out visible marking.
7. the welding method of extra large work crane cylindrical shell neckline according to claim 1, is characterized in that: described in close up body structure and cone comprises the following steps:
1) upper box body structure is made on moulding bed according to the cross centre line pulling and horizontal datum location counter;
2) by bottom cone and the concentric locating of upper box body structure to horizontal level;
3) abutment joint of raceway plate in welding equipment cone and body structure, tack welding, in inner side, adopts many people subregion to weld simultaneously, first welds the outer side weld of abutment joint, and back welding after inner side polishing back chipping, completes whole anti-welding of making cylindrical shell neckline;
4) postwelding is measured, and marks center line and the horizontal datum of cylindrical shell collar structure according to moulding bed bottom line, and carries out visible marking, is the cylindrical shell neckline of extra large work crane after integrated overturn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410120661.8A CN103949783B (en) | 2014-03-28 | 2014-03-28 | The welding method of extra large work crane cylinder neckline |
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| CN201410120661.8A CN103949783B (en) | 2014-03-28 | 2014-03-28 | The welding method of extra large work crane cylinder neckline |
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| CN103949783B CN103949783B (en) | 2017-09-05 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109128557A (en) * | 2018-10-15 | 2019-01-04 | 武汉船用机械有限责任公司 | A kind of manufacturing method of emitter water vat structural member |
| CN110757010A (en) * | 2019-11-28 | 2020-02-07 | 大族激光科技产业集团股份有限公司 | Cutting method for avoiding collision between round piece to be machined and laser head |
| CN111360441A (en) * | 2020-03-05 | 2020-07-03 | 东方电气集团东方锅炉股份有限公司 | Welding method of thick-wall closed ring |
| CN114473283A (en) * | 2022-03-24 | 2022-05-13 | 广州文冲船厂有限责任公司 | Crane base assembling and welding method and crane base assembling and welding tool |
| CN117634003A (en) * | 2024-01-24 | 2024-03-01 | 上海建工（江苏）钢结构有限公司 | Tree-shaped conversion structure manufacturing method |
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