CN103949783B - The welding method of extra large work crane cylinder neckline - Google Patents

The welding method of extra large work crane cylinder neckline Download PDF

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Publication number
CN103949783B
CN103949783B CN201410120661.8A CN201410120661A CN103949783B CN 103949783 B CN103949783 B CN 103949783B CN 201410120661 A CN201410120661 A CN 201410120661A CN 103949783 B CN103949783 B CN 103949783B
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plate
welding
ring
raceway
cone
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CN103949783A (en
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杨丽苹
杨宏
田文会
张曦
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Nantong CIMC Pacific Ocean Engineering Co., Ltd.
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Sinopacific Offshore and Engineering Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02Processes 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

Abstract

The invention discloses a kind of welding method of extra large work crane cylinder neckline, comprise the following steps:Welding equipment raceway plate, welding equipment ring flat-plate component, welding equipment ring flat-plate component and raceway plate, welding equipment body structure and peripheral board and welding equipment bottom cone, finally close up body structure and cone.It is an advantage of the invention that:Verified repeatedly through multiple projects, the cylinder neckline of extra large work crane makes in strict accordance with the welding method, is effectively reduced surplus, welding job amount is reduced, machining workload is reduced, the deformation of cylinder neckline can be controlled well, the qualification rate of finished product is improved, beneficial to popularization.

Description

The welding method of extra large work crane cylinder neckline
Technical field
The present invention relates to welding deformation controlling method, and in particular to the welding method of extra large work crane large scale cylinder neckline.
Background technology
Marine energy is increasingly by global concern, and the emergence of extra large work crane is pursued.But due to extra large work crane Cylinder collar structure material is special, from high-strength steel S690 materials, along with size is larger, is deformed in its welding process not easily-controllable System, adds the workload of welding, and qualification rate is low, is unfavorable for promoting.
The content of the invention
The technical problem to be solved in the invention is to provide a kind of weldering that can effectively control extra large work crane tube structure to deform Connect method.
In order to solve the above technical problems, the technical solution adopted by the present invention is:
The welding method of extra large work crane cylinder neckline, comprises the following steps:Welding equipment raceway plate, welding equipment ring flat-plate component, welding equipment Ring flat-plate component 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)The moulding bed of raceway plate welding equipment is made, five sections of raceway plates are hung to moulding bed, is positioned;
2)Backstep is carried out simultaneously to five pieces of raceway plate junction:2/3 on the inside of piece is first welded, then outside Side back chipping, inspection, then weld on the outside of piece, finally weld remaining 1/3 on the inside of piece;
3)Measurement is examined, after the quality for confirming above-mentioned each weld seam, the cross centre line and horizontal datum of raceway plate is marked.
Welding equipment ring flat-plate component, points of eight sections splicings, every section containing two layers of ring flat-plate up and down and its between dividing plate, in ring flat-plate is divided into Ring flat-plate and outer ring plate, it comprises the following steps:
1)Ring flat-plate component and the moulding bed of raceway plate welding equipment are made, ring flat-plate is hung to moulding bed;
2)To the inner ring plate and outer ring plate misalignment 200mm positioning splicings of each layer;
3)Weld the seam between all inner ring plates and outer ring plate:Above cushioning iron plate under seam, layer inner ring plate of first burn-oning The seam burn-on with the seam below lower floor inner ring plate, repositioning below layer inner ring plate and above lower floor's inner ring plate, seam two ends The 48-52mm positions in portion are not welded, and postwelding is mechanically smoothed;
4)Two layers of ring lining out up and down after smoothing, installs dividing plate;
5)Repeat step 2)~ step 4), until eight sections have all been welded.
Welding equipment ring flat-plate component and raceway plate comprise the following steps:
1)Ring flat-plate component and the moulding bed of raceway plate welding equipment are made, raceway plate and each section of ring flat-plate group is positioned successively on moulding bed Part, tack welding is in outside, and final stage ring flat-plate component cutting surplus holds groove repositioning, and the circle of raceway plate and moulding bed bottom line successfully With one heart, ovality is less than 6, and the surplus of inner ring meets machining requirements;
2)Connection angle welding to each section of ring flat-plate component and raceway plate in whole circumference is welded simultaneously:Every section of ring flat-plate is in girth Direction is divided at least two sections to be welded, i.e., weld from the middle to both ends, and two ends 48-52mm positions are not welded;Upper and lower ring flat-plate and raceway The welding of plate is also staggeredly carried out, i.e., first 2/3 on the inside of weldering lower ring plate, 2/3 on the inside of ring flat-plate of being burn-on again after standing up, and is carried out outside lower ring plate The back chipping of side and back welding, then remaining Welder on the inside of the back chipping and back welding and lower ring plate on the outside of upper ring plate is carried out after standing up Make, then remaining welding job on the inside of welding upper ring plate after standing up;
3)The symmetrical welding equipment for carrying out the banjo fixing butt jointing between levels ring flat-plate on moulding bed, tack welding is first welded in outside, inner side, It is inside and outside up and down staggeredly to be welded, with step 2), the two ends of inner ring plate abutted seam and the internal orifice of outer ring plate abutted seam are using length Spend the ceramic substrate for 140-160mm;
4)The deformation of above-mentioned box-structure and the welding quality of weld seam are examined in measurement after 72 hours.
Welding equipment box-structure and peripheral board comprise the following steps:
1)Gutter channel at peripheral board, 4 interim manholes and 4 of cutting is installed in the outside of box-structure, manhole is mended plate and carried out Direction, mark, hold groove successfully, sealing and mend after internal work terminates, after 3 interim manholes inner sides are welded, outside back chipping back welding, Welded on the outside of last remaining interim manhole, double-faced forming;
2)Measurement, inspection, carry out the mark of cross centre line and horizontal datum, upper box body structure welding is complete again Into;
Welding equipment bottom cone comprises the following steps:
1)Make the assembled moulding bed of cone, it is counter make to position successively on moulding bed fix piece between five blocks of cone plates, cone plate Gap is not more than 2mm, and edges of boards difference is less than 2mm, angularity deviation 2mm;
2)First on the inside of weldering piece, at least three sections backstep weldings of short transverse point, after inner side weldering 2/3, outside back chipping, welding, finally It is soldered the remaining work in inner side;
3)Cut according to actual measured results and installed after surplus, position the 6th block of cone plate, piece welding requirements is with reference to step Rapid 2);
4)The postwelding measurement suitable for reading descending and lower mouth of cone is up, pulls cross centre line and horizontal datum, and carry out bright Aobvious mark.
Close up body structure and cone comprises the following steps:
1)Upper box body structure is made on moulding bed according to cross centre line and the horizontal datum positioning pulled counter;
2)By bottom cone and upper box body structure concentric locating to horizontal level;
3)Welding equipment cone and the abutment joint of raceway plate in body structure, tack welding are welded simultaneously in inner side using many people's subregions Connect, first weld back welding after the outer side weld of abutment joint, inner side polishing back chipping, complete the whole anti-welding for making cylinder neckline;
4)Postwelding is measured, and marks according to moulding bed bottom line the center line and horizontal datum of cylinder collar structure, and is carried out Visible marking, is the cylinder neckline of extra large work crane after overall upset.
It is an advantage of the invention that:Verified repeatedly through multiple projects, the cylinder neckline of extra large work crane is in strict accordance with the welding side Method makes, and is effectively reduced surplus, reduces welding job amount, reduces machining workload, cylinder neckline can be controlled well Deformation, improves the qualification rate of finished product, beneficial to popularization.
Brief description of the drawings
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
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 middle ring board component moulding bed position view of the present invention;
Fig. 4 is the structural representation of middle ring board component of the present invention;
Fig. 5 is middle ring board component of the present invention and raceway plate moulding bed position view;
Fig. 6 is middle ring board component of the present invention and raceway plate weld profile;
Fig. 7 is outer ring plate end connector ruggedized construction schematic diagram in the present invention;
Fig. 8 is the mplifying structure 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-cylinder collar structure schematic diagram made 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, the piece between 102, raceway plate, 103, welding bead, 2, ring flat-plate Component, 201, inner ring plate, 202, outer ring plate, 203, the moulding bed of ring flat-plate component welding equipment, 211, weld seam, 3, dividing plate, 4, ring flat-plate component With the moulding bed of raceway plate welding equipment, 5, the plates of δ 25,501, bolt, 6, ceramic substrate, 7, peripheral board, 8, box-structure, 9, cone it is assembled Moulding bed, 10, annular moulding bed, 11, cone, 111, cone plate, 12, body structure, 13, gutter channel, A, the inner side of piece, B, spelling The outside of seam.
Embodiment:
The welding method of extra large work crane cylinder neckline, comprises the following steps:
A, welding equipment raceway plate 1:
1)As shown in figure 1, making the moulding bed 101 of raceway plate welding equipment, five sections of raceway plates are hung to moulding bed, positioned, it is ensured that just Tolerance is 10160
2)In the high 1260mm of raceway plate 1, welding process, cone is easily formed, is that linearity above and below guarantee is less than 2, need pair Five pieces 102 of the junction of raceway plate 1 carry out backstep simultaneously, divide three sections or more, tack welding uses round steel mistake in outside Cross, the upper and lower side of piece 102 install additional draw, arc-extinguishing plate, as shown in Figure 2:The 2/3 of the inner side A of piece 102 is first welded, then B is clear in outside Root, inspection, then the outside B of piece 102 is welded, the inner side A remaining 1/3 of piece 102 is finally welded, inside and outside alternating once completes whole Welding job, and the angularity of piece 102 is checked with model at any time, the workload of the interior external welding of adjustment in time, every layer of welding bead 103 Joint stagger, spacing be more than 25mm, it is stepped;
3)Measurement is examined, after the quality for confirming above-mentioned each weld seam, the cross centre line and horizontal datum of raceway plate is marked.
B, welding equipment ring flat-plate component 2, points of eight sections splicings, every section containing two layers of ring flat-plate up and down and its between dividing plate 3, ring flat-plate point For inner ring plate 201 and outer ring plate 202:
1)As shown in figure 3, making ring flat-plate component 2 and the moulding bed 203 of the welding equipment of raceway plate 1, ring flat-plate is hung to moulding bed 203;
2)As shown in figure 4, to the inner ring plate 201 and the misalignment 200mm positioning splicings of outer ring plate 202 of each layer;
3)Weld the seam between all inner ring plates 201 and outer ring plate 202:Cushioning iron plate under seam, a layer inner ring of first burn-oning Seam above plate and below lower floor's inner ring plate, repositions the seam below layer inner ring plate of burn-oning and above lower floor's inner ring plate, connects The 48-52mm positions at seam both ends are not welded, and postwelding is mechanically smoothed;
4)Two layers of ring lining out up and down after smoothing, installs dividing plate 3;
5)Repeat step 2)~ step 4), until eight sections have all been welded.
C, welding equipment ring flat-plate component 2 and raceway plate 1:
1)As shown in figure 5, making ring flat-plate component 2 and the moulding bed 4 of the welding equipment of raceway plate 1, raceway plate is positioned successively on moulding bed 4 1 the cutting of final stage ring flat-plate component 2 surplus, holds groove repositioning, and raceway successfully in outside with each section of ring flat-plate component 2, tack welding The circle of plate 1 and the bottom line of moulding bed 4 is concentric, and ovality is less than 6, and the surplus of inner ring meets machining requirements;
2)Connection angle welding to each section of ring flat-plate component 2 and raceway plate 1 in whole circumference is welded simultaneously:Every section of ring flat-plate is in week Length direction is divided at least two sections to be welded, i.e., weld from the middle to both ends;The welding of upper and lower ring flat-plate and raceway plate 1 also interlock into OK, as shown in Figure 6:First 2/3 on the inside of weldering lower ring plate, 2/3 on the inside of ring flat-plate of being burn-on again after standing up, and the back chipping on the outside of lower ring plate is carried out And back welding, then remaining welding job on the inside of the back chipping and back welding and lower ring plate on the outside of upper ring plate is carried out after standing up, then turn over Remaining welding job on the inside of welding upper ring plate after one's death, wherein:Every section of ring flat-plate two ends 48-52mm positions are not welded, each side welding Capping layer uses normalizing pass, and the joint of each layer welding bead staggers no less than 25mm;As shown in fig. 7, standing up front upper and lower layer outer ring plate 202 16 end connectors add the plates 5 of δ 25 to fix, and bolt 501 is unclamped after standing up, and are tightened again before standing up next time;Due to empty herein Between it is narrow and small, preheating temperature is higher, and does not allow to blow a cold wind over, and need to take certain safety prevention measure;
3)The symmetrical welding equipment for carrying out the banjo fixing butt jointing between levels ring flat-plate on moulding bed 4, tack welding is in outside, and inner side is first Weldering, it is inside and outside up and down staggeredly to be welded, with step 2), the two ends of the abutted seam of inner ring plate 201 and the internal orifice of the abutted seam of outer ring plate 202 Length is used for 140-160mm ceramic substrate 6, as shown in Figure 8;The abutted seam of same place inner and outer ring requires that one-time continuous is complete Into should not pause, inside and outside standing up and still need to do necessary reinforcement when alternately welding needs not to be removed after standing up halfway;
4)The deformation of above-mentioned box-structure 8 and the welding quality of weld seam are examined in measurement after 72 hours.
D, welding equipment box-structure 8 and peripheral board 7, as shown in Figure 9:
1)Gutter channel at peripheral board 7,4 interim manholes and 4 of cutting is installed in the outside of box-structure 8, as shown in figure 13, Manhole mends plate and carries out direction, mark, hold groove successfully, seals and mends after internal work terminates, after being welded on the inside of 3 interim manholes, outside Welded on the outside of side back chipping back welding, last remaining interim manhole, double-faced forming;
2)Measurement, inspection, carry out the mark of cross centre line and horizontal datum, upper box body structure 12 has been welded again Into.
E, welding equipment bottom cone 10:
1)As shown in Figure 10, the assembled moulding bed 9 of cone 10 is made, annular moulding bed 10 is fixed using angle steel, made counter on moulding bed Five blocks of cone plates 111 are fixed in positioning successively, and the gap of 111 pieces of cone plate is not more than 2mm, and edges of boards difference is less than 2mm, angularity Deviation 2mm;
2)First on the inside of weldering piece, at least three sections backstep weldings of short transverse point, after inner side weldering 2/3, outside back chipping, welding, finally It is soldered the remaining work in inner side;
3)Cut according to actual measured results and installed after surplus, position the 6th block of cone plate, piece welding requirements is with reference to step Rapid 2), after welding as shown in figure 11;
4)The postwelding measurement suitable for reading descending and lower mouth of cone 11 is up, pulls cross centre line and horizontal datum, and carry 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 cross centre line and the horizontal datum positioning pulled counter;
2)By bottom cone 11 and the concentric locating of upper box body structure 12 to horizontal level;
3)The abutment joint of raceway plate 1 in welding equipment cone 11 and body structure 12, tack welding is same using many people's subregions in inner side When weld, first weld abutment joint outer side weld, inner side polishing back chipping after back welding, welded simultaneously using many people's subregions during welding, And one-time continuous is completed, halfway without pause, the whole anti-welding for making cylinder neckline is completed;
4)Postwelding is measured, and marks according to moulding bed bottom line the center line and horizontal datum of cylinder collar structure, and is carried out Visible marking, is the cylinder neckline of extra large work crane after overall upset, as shown in figure 14.

Claims (3)

1. the welding method of extra large work crane cylinder neckline, it is characterised in that:Comprise the following steps:Welding equipment raceway plate, welding equipment ring flat-plate Component, welding equipment ring flat-plate component and raceway plate, welding equipment box-structure and peripheral board and welding equipment bottom cone, finally close up casing knot Structure and cone;
The welding equipment raceway plate comprises the following steps:
1)The moulding bed of raceway plate welding equipment is made, five sections of raceway plates are hung to moulding bed, is positioned;
2)Backstep is carried out simultaneously to five pieces of raceway plate junction:First 2/3 on the inside of weldering piece, then clear in outside Root, inspection, then weld on the outside of piece, finally weld remaining 1/3 on the inside of piece;
3)Measurement is examined, after the quality for confirming above-mentioned each weld seam, the cross centre line and horizontal datum of raceway plate is marked;
Points of eight sections splicings of the welding equipment ring flat-plate component, every section containing two layers of ring flat-plate up and down and its between dividing plate, in ring flat-plate is divided into Ring flat-plate and outer ring plate, it comprises the following steps:
1)Ring flat-plate component and the moulding bed of raceway plate welding equipment are made, ring flat-plate is hung to moulding bed;
2)To the inner ring plate and outer ring plate misalignment 200mm positioning splicings of each layer;
3)Weld the seam between all inner ring plates and outer ring plate:Above cushioning iron plate under seam, layer inner ring plate of first burn-oning with Seam below layer inner ring plate, repositions the seam below layer inner ring plate of burn-oning and above lower floor's inner ring plate, seam both ends 48-52mm is not welded position, and postwelding is mechanically smoothed;
4)Two layers of ring lining out up and down after smoothing, installs dividing plate;
5)Repeat step 2)~ step 4), until eight sections have all been welded;
The welding equipment ring flat-plate component and raceway plate comprise the following steps:
1)The moulding bed of ring flat-plate component welding equipment is made, raceway plate and each section of ring flat-plate component is positioned successively on moulding bed, tack welding is outside Side, final stage ring flat-plate component cutting surplus holds groove repositioning successfully, and the circle of raceway plate and moulding bed bottom line is concentric, and ovality is small In 6, the surplus of inner ring meets machining requirements;
2)Connection angle welding to each section of ring flat-plate component and raceway plate in whole circumference is welded simultaneously:Every section of ring flat-plate is in circumferential direction It is divided at least two sections to be welded, i.e., welds from the middle to both ends, two ends 48-52mm positions is not welded;Upper and lower ring flat-plate and raceway plate Welding is also staggeredly carried out, i.e., first 2/3 on the inside of weldering lower ring plate, 2/3 on the inside of ring flat-plate of being burn-on again after standing up, and is carried out on the outside of lower ring plate Back chipping and back welding, then carry out remaining welding job on the inside of the back chipping and back welding and lower ring plate on the outside of upper ring plate after standing up, Remaining welding job on the inside of upper ring plate is welded after standing up again;
3)The symmetrical welding equipment for carrying out the banjo fixing butt jointing between levels ring flat-plate on moulding bed, tack welding is first welded in outside, inner side, up and down It is inside and outside staggeredly to be welded, with step 2), the two ends of inner ring plate abutted seam and the internal orifice of outer ring plate abutted seam use length for 140-160mm ceramic substrate;
4)The deformation of above-mentioned box-structure and the welding quality of weld seam are examined in measurement after 72 hours;
The welding equipment box-structure and peripheral board comprise the following steps:
1)Box-structure outside install peripheral board, cutting 4 interim manholes and 4 at gutter channel, manhole benefit plate carry out direction, Mark, hold groove successfully, seal and mend after internal work terminates, after being welded on the inside of 3 interim manholes, outside back chipping back welding is remaining Last interim manhole on the outside of weld, double-faced forming;
2)Measurement, inspection, carry out the mark of cross centre line and horizontal datum again, and upper box body structure welding is completed.
2. the welding method of extra large work crane cylinder neckline according to claim 1, it is characterised in that:The welding equipment lower cone Body comprises the following steps:
1)The assembled moulding bed of cone is made, the gap for fixing piece between five blocks of cone plates, cone plate is positioned on moulding bed successively in counter make No more than 2mm, edges of boards difference is less than 2mm, angularity deviation 2mm;
2)First on the inside of weldering piece, at least three sections backstep weldings of short transverse point, after inner side weldering 2/3, outside back chipping, welding are finally soldered The remaining work in inner side;
3)Cut according to actual measured results and installed after surplus, position the 6th block of cone plate, piece welding requirements is with reference to step 2);
4)The postwelding measurement suitable for reading descending and lower mouth of cone is up, pulls cross centre line and horizontal datum, and carry out obvious mark Note.
3. the welding method of extra large work crane cylinder neckline according to claim 1, it is characterised in that:It is described to close up casing knot Structure and cone comprise the following steps:
1)Upper box body structure is made on moulding bed according to cross centre line and the horizontal datum positioning pulled counter;
2)By bottom cone and upper box body structure concentric locating to horizontal level;
3)Welding equipment cone and the abutment joint of raceway plate in body structure, tack welding are welded simultaneously in inner side using many people's subregions, first Back welding after the outer side weld of abutment joint, inner side polishing back chipping is welded, the whole anti-welding for making cylinder neckline is completed;
4)Postwelding is measured, and marks according to moulding bed bottom line the center line and horizontal datum of cylinder collar structure, and is carried out substantially Mark, is the cylinder neckline of extra large work crane after overall upset.
CN201410120661.8A 2014-03-28 2014-03-28 The welding method of extra large work crane cylinder neckline Active CN103949783B (en)

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CN109128557B (en) * 2018-10-15 2020-07-21 武汉船用机械有限责任公司 Manufacturing method of launching device water tank structural member
CN110757010B (en) * 2019-11-28 2021-04-13 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

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CN201931189U (en) * 2010-12-13 2011-08-17 舟山中远船务工程有限公司 Automatic submerged arc welding platform for cylinder plates of ship crane
CN201960307U (en) * 2010-12-13 2011-09-07 舟山中远船务工程有限公司 Rotating construction platform for making ship crane cylinder by sections
JP2012206156A (en) * 2011-03-30 2012-10-25 Tadano Ltd Boom, and method for welding the same
CN202622270U (en) * 2012-04-24 2012-12-26 江苏政田重工股份有限公司 Tower body welding device for ship crane
CN202715934U (en) * 2012-06-13 2013-02-06 盛阳 Special automatic welding equipment used for gaps of case of line-lifted crane
CN102922161A (en) * 2012-11-19 2013-02-13 武汉船用机械有限责任公司 Method for controlling deformation of principal welding seam of ship crane
CN103332611A (en) * 2013-04-23 2013-10-02 上海振华重工(集团)股份有限公司 Fabrication method of arm support of crane

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201931189U (en) * 2010-12-13 2011-08-17 舟山中远船务工程有限公司 Automatic submerged arc welding platform for cylinder plates of ship crane
CN201960307U (en) * 2010-12-13 2011-09-07 舟山中远船务工程有限公司 Rotating construction platform for making ship crane cylinder by sections
JP2012206156A (en) * 2011-03-30 2012-10-25 Tadano Ltd Boom, and method for welding the same
CN202622270U (en) * 2012-04-24 2012-12-26 江苏政田重工股份有限公司 Tower body welding device for ship crane
CN202715934U (en) * 2012-06-13 2013-02-06 盛阳 Special automatic welding equipment used for gaps of case of line-lifted crane
CN102922161A (en) * 2012-11-19 2013-02-13 武汉船用机械有限责任公司 Method for controlling deformation of principal welding seam of ship crane
CN103332611A (en) * 2013-04-23 2013-10-02 上海振华重工(集团)股份有限公司 Fabrication method of arm support of crane

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