CN104128694A - Longitudinal seam red copper liner welding process of steel sheet pressure vessel and red copper liner used by same - Google Patents
Longitudinal seam red copper liner welding process of steel sheet pressure vessel and red copper liner used by same Download PDFInfo
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- CN104128694A CN104128694A CN201410355772.7A CN201410355772A CN104128694A CN 104128694 A CN104128694 A CN 104128694A CN 201410355772 A CN201410355772 A CN 201410355772A CN 104128694 A CN104128694 A CN 104128694A
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- copper liner
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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
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/035—Seam welding; Backing means; Inserts with backing means disposed under the seam
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/003—Cooling means
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/10—Pipe-lines
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a longitudinal seam red copper liner welding process of a steel sheet pressure vessel. The longitudinal seam red copper liner welding process sequentially comprises the steps of (a), aligning and splicing a longitudinal seam of a machined cylinder and carrying out point welding fixation; (b), placing the inner longitudinal seam of the machined cylinder on a red copper liner; (c), aligning the longitudinal seam of the machined cylinder to the center line of a welding groove of the red copper liner, fixing the machined cylinder and the red copper liner through an air cylinder, and guiding water into a cooling water pipe of the red copper liner; (d), carrying out welding; (e), disassembling the machined cylinder after the longitudinal seam of the machined cylinder is welded. The welding process has the advantages that automatic submerged arc welding of one-side welding and two-side forming is achieved, the RT flaw detection qualification rate is high, welding flux is saved, the manufacturing quality of the steel sheet pressure vessel is improved, and the production cost is lowered.
Description
Technical field
The present invention relates to a kind of pressure vessel welding procedure, the copper liner that is specifically related to a kind of steel sheet pressure vessel longitudinal joint copper liner welding procedure and uses.
Background technology
Steel sheet pressure vessel diameter is generally at 250～600mm, and material is Q235-B, wall thickness 3～5mm; Be applied in during industrial and mining enterprises produce, mainly contain the products such as oil expeller, gs-oil separator, flange form air cleaner, air heat exchanger of air compressor storage tank, air cleaning series.
At present, steel sheet pressure vessel is applied extremely extensive in the suitability for industrialized production of China, and demand is huge.In recent years, the steel sheet pressure vessel number of units that my company manufactures often increases progressively with 30% every year, and annual production is crossed ten thousand.Because longitudinal joint and girth welding are the master operations that pressure vessel is manufactured, only be improved steel sheet pressure vessel longitudinal seam welding efficiency and X ray (RT) flaw detection qualification rate, quality and the production efficiency that could improve product, reduce production costs, and guarantees the survival and development of enterprise.
Traditional welding procedure, the longitudinal seam welding of steel sheet pressure vessel adopts two-sided welding, first longitudinal joint in cylindrical shell is welded to one manual electric arc welding, then to after the outer longitudinal joint polishing of cylindrical shell back chipping, then carries out one Lincoln weld.Because steel sheet pressure vessel diameter is little, narrow space, insufficient light in cylindrical shell, the not good many factors that waits in visual angle, while carrying out manual electric arc welding in cylindrical shell longitudinal joint, welder's operating difficulties, be difficult to guarantee the welding quality of longitudinal seam in cylindrical shell, make inside weld easily produce pore, the bad defect such as slag inclusion and surperficial undercut, according to < < bearing device Non-Destructive Testing > > (JB/T4730-2005) and < < GB150-1998 > > (GB150-2011) standard, in weld seam, single hole diameter is answered≤1/2 thickness of slab, or wall scroll slag inclusion length≤6mm on same line, the undercut degree of depth on container welding surface must not be greater than 0.5mm, undercut continuous length must not be greater than 100mm, otherwise weld defect exceeds standard defective, cause weld seam X ray (RT) flaw detection and surface quality qualification rate is low, repair rate is high, thereby increased cost of goods manufactured and manufacturing cycle.
Based on above-mentioned situation, test of many times is passed through by my company, find to adopt the welding procedure of one side welding with back formation to weld steel sheet pressure container cylinder longitudinal joint, can exempt longitudinal joint manual electric arc welding welding operation in cylindrical shell, improve cylindrical shell longitudinal joint RT flaw detection qualification rate, thereby improve speed of welding and the welding quality of longitudinal joint.Therefore, my company changes the longitudinal seam welding of barrel technique of steel sheet pressure vessel into one side welding with back formation by original welding by both sides, and the welding procedure of one side welding with back formation need to be used liner, at first, my company has adopted the Lincoln weld method of solder flux liner one side welding with back formation, the welding efficiency of longitudinal joint is improved, and also solves the cylindrical shell longitudinal joint one side welding with back formation problem of steel sheet pressure vessel, but has following shortcoming:
(1) longitudinal seam shaping surface is undesirable in cylindrical shell, as weld seam exists undercut, slag inclusion, the blemish such as not round and smooth and overlap with mother metal transition;
(2) cylindrical shell longitudinal joint RT flaw detection qualification rate is on the low side, repair rate is higher;
(3) flux material consumption is large, increases cost of goods manufactured.
Summary of the invention
For overcoming the Lincoln weld technique shortcoming of above solder flux liner one side welding with back formation, we utilize copper liner to replace solder flux liner through test of many times.The experiment proved that, it is attractive in appearance, round and smooth with mother metal transition that the cylindrical shell longitudinal joint surfaces externally and internally of steel sheet pressure vessel is shaped, and RT flaw detection qualification rate is high, has saved flux material, has improved the workmanship of steel sheet pressure vessel, has reduced production cost.
The present invention solves this technical problem adopted technical scheme: a kind of steel sheet pressure vessel longitudinal joint copper liner welding procedure, and its step is as follows successively:
(a) will process cylindrical shell longitudinal joint to splicing, the spot welding of going forward side by side is fixed;
(b) longitudinal joint in this processing cylindrical shell is placed on copper liner;
(c) center line of the welding groove of the longitudinal joint of this processing cylindrical shell and copper liner is aligned, by cylinder, fix this processing cylindrical shell and copper liner, the cooling water pipe water flowing of this copper liner;
(d) welding;
(e) this processing longitudinal seam welding of barrel is complete, unloads this processing cylindrical shell.
Further, this copper liner is block, and its upper surface is the curved surface of an evagination, and is provided with a longitudinal welding groove, and the lower surface of this copper liner has a longitudinal cold pipe groove, the embedded cooling water pipe of this cold pipe groove.
Further, the corrosion, greasy dirt, oxide skin and the moisture content that before weldering, the interface of this processing cylindrical shell and both sides, welding position are not less than within the scope of 20mm are removed totally.
Further, after the longitudinal joint and copper liner centering of this processing cylindrical shell, promote this copper liner fit tightly with processing cylindrical shell longitudinal joint by least one cylinder, this number of cylinders is definite according to the length of this processing cylindrical shell, and this cylinder distribute spacing is 200mm.
Particularly, this processing cylindrical shell longitudinal joint groove type that thickness of slab is 3～5mm is that groove gap gets 0
+ 1, bevel angle is 0 °.
The present invention solves this technical problem another technical scheme is also provided: a kind of copper liner, it is block, and its upper surface is the curved surface of an evagination, and is provided with a longitudinal welding groove, the lower surface of this copper liner has a longitudinal cold pipe groove, the embedded cooling water pipe of this cold pipe groove.
Further, this cooling water pipe is copper tube, and this red copper cooling water pipe is close in this cold pipe groove by extruding.
Particularly, the profile radius R on the arc limit of the cross section of this copper liner is 85%～95% of this processing cylindrical shell radius.
Particularly, the processing longitudinal seam welding of barrel that is 3～5mm to thickness of slab, the sectional area>=2500mm of this copper liner
2.
Particularly, the processing longitudinal seam welding of barrel that is 3～5mm to thickness of slab, the value of the depth H of this welding groove is≤1.5mm.
Compared with prior art, because the thermal conductivity factor of red copper is large, heat transfer speed is high, can avoid weld metal to fuse into copper liner, welding procedure of the present invention utilizes copper liner to replace solder flux liner to carry out the Lincoln weld of one side welding with back formation, the cylindrical shell longitudinal joint surfaces externally and internally of simultaneously having realized steel sheet pressure vessel is shaped attractive in appearance, round and smooth with mother metal transition, RT flaw detection qualification rate is high, saved flux material, the workmanship that has improved steel sheet pressure vessel, has reduced the technique effects such as production cost.
Below in conjunction with drawings and Examples, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is the cross sectional representation of copper liner of the present invention.
Fig. 2 is section of weld joint figure of the present invention.
Fig. 3 is the partial enlarged drawing of the I portion of above-mentioned section of weld joint figure.
Fig. 4 is the schematic diagram of processing cylindrical shell butting grooves.
Fig. 5 is use state diagram of the present invention.
The specific embodiment
Please refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, steel sheet pressure vessel longitudinal joint copper liner welding procedure of the present invention comprises following main points:
(1) select suitable copper liner 10.
This copper liner 10 is block.It should be noted that, copper liner 10 is the upper surface 11 of copper liner 10 with the one side that contacts and weld of processing cylindrical shell 20, and it is the curved surface of an evagination.The opposite of the upper surface 11 of this copper liner 10 is the lower surface 12 of copper liner 10.The cross section of copper liner 10 is this upper surface 11, lower surface 12 and two frontal plane of projection that side surround adjacent with two straight flanges of this upper surface 11, the high a of this cross section be two straight flanges of this upper surface 11 to lower surface 12 average distance, the wide b of this cross section is the distance between two sides.The arc limit of this cross section is cutting upper surface formation.
During processing cylindrical shell 20 longitudinal seam welding that is 3～5mm to thickness of slab, the sectional area>=2500mm of copper liner 10
2, otherwise the heat transfer speed of liner is low, the temperature of liner is high, causes weld seam 21 surfaces to ooze copper or weld seam 21 metals fuse into red copper, affects the service life of copper liner 10 and the welding quality of weld seam 21; The wide b of this cross section is greater than 2 with high a ratio, guarantees copper liner 10 flexibilities, when being beneficial to copper liner 10 and rising and cylindrical shell 20 inner surfaces fit tightly.
The profile radius R on the arc limit of the cross section of copper liner 10 is basically identical with processing cylindrical shell 20 radiuses, and its profile radius R value is 85%～95% of processing cylindrical shell 20 radiuses.
The upper surface 11 of copper liner 10 is provided with one and longitudinally welds groove 13, and it is mutually vertical with this cross section, connects the upper surface 11 of copper liner 10, for processing the shaping of cylindrical shell 20 inside welds 21.The depth H of this welding groove 13 is determined according to processing cylindrical shell 20 thicknesss of slab, processing cylindrical shell 20 longitudinal seam weldings of thickness of slab 3～5mm, and the value of the depth H of this welding groove 13 is≤1.5mm.As H value is chosen excessive, thereby form during longitudinal seam welding, processing cylindrical shell 20 inside weld 21 reinforcements are too high easily produces pore 22 defects at weld seam 21 reinforcement places, as shown in Figures 2 and 3, and according to the relevant regulations of GB150-2011 < < GB150-1998 > >, weld seam 21 reinforcements are too high, defective, weld groove 13 simultaneously and answer rounding off everywhere, cylindrical shell 20 inside welds 21 are shaped round and smooth, the stress reducing between weld seam 21 and mother metal is concentrated.
The lower surface 12 of copper liner 10 has a longitudinal cold pipe groove 14, and it is mutually vertical with this cross section, connects the lower surface 12 of copper liner 10, the embedded cooling water pipe 15 of this cold pipe groove 14, its interior water flowing is cooling, reduces the temperature of copper liner 10, to guarantee welding quality.The preferred copper tube of this cooling water pipe 15, red copper cooling water pipe 15 is close in cold pipe groove 14 by extruding, improves cooling water heat exchange efficiency, accelerates copper liner 10 heat transfer speeds.
After processing cylindrical shell 20 longitudinal joints and copper liner 10 centerings, by a plurality of cylinders 30, promote copper liner 10, cylinder 30 quantity are definite according to the length of cylindrical shell 20, and cylinder 30 distribute spacings are 200mm.The interior longitudinal joint of cylindrical shell 20 and copper liner 10 are fitted tightly, avoid cylindrical shell 20 longitudinal joints and copper liner 10 excesssive gaps to cause inside weld 21 too high and easily produce pore 22 or weld seam 21 easily by defects such as burn-throughs.
Thickness of slab be 3～5mm processing cylindrical shell 20 longitudinal joint groove types as shown in Figure 4: groove gap gets 0
+ 1, bevel angle is 0 °.
(2) cleaning of welding position.
Corrosion, greasy dirt, oxide skin and the moisture content etc. that before weldering, interface and both sides, welding position are not less than within the scope of 20mm are removed clean.As surface of steel plate is not cleaned out, remaining have the foreign material such as iron rust, a defect such as the as easy as rolling off a log generation pore 22 of weld seam 21, slag inclusion during welding.The cleaning of welding position can be removed by hand, such as wire brush, portable abrasive machine or wire wheel etc., and mechanical removal can be taken the methods such as sandblast or oxygen, acetylene torch and be carried out.
(3) selection of welding condition.
The source of welding current: GS-600SS-2 arc welding rectifier.
Wlding material and specification, welding current, weldingvoltage, speed of welding and wire feed rate see the following form 1:
Table 1
(4) step of welding procedure is as follows successively:
(a) will process cylindrical shell 20 longitudinal joints to splicing, the spot welding of going forward side by side is fixed;
(b) the interior longitudinal joint of this processing cylindrical shell 20 is placed on copper liner 10;
(c) center line of the welding groove 13 of the longitudinal joint of this processing cylindrical shell 20 and copper liner 10 is aligned, by cylinder 30, fix this processing cylindrical shell 20 and copper liner 10, cooling water pipe 15 water flowings of this copper liner 10;
(d) according to said welding method parameter, carry out welding;
(e) these processing cylindrical shell 20 longitudinal seam weldings are complete, unload this processing cylindrical shell 20.
(5) postwelding check.
Inspected the interior about 5mm of longitudinal seam shaping width of processing cylindrical shell of welding, reinforcement h
2≤ 1.5 mm; Outer longitudinal seam width≤15mm, reinforcement h
1≤ 1.5 mm, weld seam nonstraightness≤1 mm, inner and outer welding smooth surface, the bad defect such as pore-free, undercut exists, and < < bearing device Non-Destructive Testing > > (JB/T4730-2005) assessment of conformity is pressed in RT flaw detection.
(6) cost accounting.
One side welding with back formation Lincoln weld welding technology and the welding by both sides of this copper liner, the welding procedure that solder flux the is made liner RT flaw detection qualification rate of comparing improves approximately more than 25%, save the about 0.1Kg/m of solder flux, Yi Wo unit manufactures 1.5 ten thousand meters of thin plate pressure vessel every year, my unit can save RT flaw detection film and film making artificial (3750 * 7=26250 of film unit) every year, the about 2250Kg of solder flux * 4.1=9225 unit), save the about 4000kg of welding bar for hand electric arc-welding * 4.3=17200 unit, save 15000 * 5=75000 of manual electric arc welding labour cost unit, within 1 year, add up to and save 1,276,750,000 yuan, shorten every pressure vessel manufacturing time, improve the quality of products, the direct economic effect indirect economic effect producing is very remarkable, company is created to good economic benefit.
The present invention is not limited to above-mentioned embodiment, if various changes of the present invention or modification are not departed to the spirit and scope of the present invention, if within these changes and modification belong to claim of the present invention and equivalent technologies scope, the present invention is also intended to comprise these changes and modification.
Claims (10)
1. a steel sheet pressure vessel longitudinal joint copper liner welding procedure, is characterized in that, its step is as follows successively:
(a) will process cylindrical shell longitudinal joint to splicing, the spot welding of going forward side by side is fixed;
(b) longitudinal joint in this processing cylindrical shell is placed on copper liner;
(c) center line of the welding groove of the longitudinal joint of this processing cylindrical shell and copper liner is aligned, by cylinder, fix this processing cylindrical shell and copper liner, the cooling water pipe water flowing of this copper liner;
(d) welding;
(e) this processing longitudinal seam welding of barrel is complete, unloads this processing cylindrical shell.
2. steel sheet pressure vessel longitudinal joint copper liner welding procedure as claimed in claim 1, it is characterized in that: this copper liner is for block, its upper surface is the curved surface of an evagination, and be provided with a longitudinal welding groove, the lower surface of this copper liner has a longitudinal cold pipe groove, the embedded cooling water pipe of this cold pipe groove.
3. steel sheet pressure vessel longitudinal joint copper liner welding procedure as claimed in claim 1, is characterized in that: the corrosion, greasy dirt, oxide skin and the moisture content that before weldering, the interface of this processing cylindrical shell and both sides, welding position are not less than within the scope of 20mm are removed totally.
4. steel sheet pressure vessel longitudinal joint copper liner welding procedure as claimed in claim 1, it is characterized in that: after the longitudinal joint of this processing cylindrical shell and copper liner centering, by at least one cylinder, promoting this copper liner fixes, this number of cylinders is definite according to the length of this processing cylindrical shell, and this cylinder distribute spacing is 200mm.
5. steel sheet pressure vessel longitudinal joint copper liner welding procedure as claimed in claim 1, is characterized in that: this processing cylindrical shell longitudinal joint groove type that thickness of slab is 3～5mm is that groove gap gets 0
+ 1, bevel angle is 0 °.
6. a copper liner, is characterized in that: it is for block, and its upper surface is the curved surface of an evagination, and is provided with a longitudinal welding groove, and the lower surface of this copper liner has a longitudinal cold pipe groove, the embedded cooling water pipe of this cold pipe groove.
7. copper liner as claimed in claim 6, is characterized in that: this cooling water pipe is copper tube, and this red copper cooling water pipe is close in this cold pipe groove by extruding.
8. copper liner as claimed in claim 6, is characterized in that: the profile radius R on the arc limit of the cross section of this copper liner is 85%～95% of this processing cylindrical shell radius.
9. copper liner as claimed in claim 6, is characterized in that: the processing longitudinal seam welding of barrel that is 3～5mm to thickness of slab, the sectional area>=2500mm of this copper liner
2.
10. copper liner as claimed in claim 6, is characterized in that: the processing longitudinal seam welding of barrel that is 3～5mm to thickness of slab, value of the depth H of this welding groove is≤1.5mm.
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