CN101417364B - Semi-automatic welding method of metal flux cored filler rod conduit root - Google Patents
Semi-automatic welding method of metal flux cored filler rod conduit root Download PDFInfo
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Abstract
The invention relates to the technical field of welding of a long distance pipeline and is a semi-automatic welding method of root welding of a pipeline with metal powder core welding wire; the root welding layer welding is carried out as follows: the metal powder core welding wire and short arc control technology are adopted, protective gases are added to carry out welding of root welding bead of full position; the welding parameters are as follows: welding current is 140A to 200A; the welding voltage is 15V to 18V; the welding speed is 16cm/min to 26cm/min; the wire feed speed is 350cm/min to 500cm/min; the wire extension is 8mm to 12mm; and the pendulum deflection is based on that weld metal is deposited to the edge of a welding pipeline. The method solves the bottleneck problem of restraining the flow construction operation of the semi-automatic welding, effectively solves the problems of undercut, depression and the like of the back surface of welding seams of circular welding joints, reduces the cost of cleaning of the surface of welding pipelines, reduces the labor intensity of workers, increases the thickness of deposited metal, reduces the welding layers, greatly improves welding production efficiency, obtains high-quality welding seams and improves the welding speed, can reduce one third time of welding compared with manual welding and reduces the operation cost.
Description
One, technical field:
The present invention relates to the welding technology field of long distance pipeline, is a kind of semi-automatic welding method of metal flux cored filler rod conduit root.
Two, background technology:
At present, the domestic filling weldering of adopting in the long distance pipeline engineering construction, cosmetic welding technology are similar, and root bead technology has bigger difference, mainly contains three kinds:
(1) internal welding machine: this welding machine is the product that weldering automatically combines with internal clamp, finishes root bead simultaneously by six automatic welding gun heads in the pipe certainly, and technology is ripe, and fastest, best in quality, but equipment cost is very high, and complex structure, the field maintenance difficulty;
What (2) the employing solid core welding wire carried out is semi-automatic down to root bead (as U.S. STT root bead equipment, Italian PWT root bead equipment): this technology is comparatively ripe, just strict to gap, unfitness of butt joint to the pipe joint group, very easily produce sidewall incomplete fusion defective, in case the gap is greater than 1mm, current interruption will appear, and cost is higher, and complex structure is unfavorable for field maintenance;
(3) SMAW: be to adopt pricker to tie up plain type welding rod to carry out under the craft to root bead, speed is slow, and cost is lower, and labor strength is big.
Three, summary of the invention:
The invention provides a kind of semi-automatic welding method of metal flux cored filler rod conduit root, the deficiency that it has overcome above-mentioned prior art has solved a bottleneck difficult problem that restricts semi-automatic welding flowing water construction operation, has improved operating efficiency greatly.
Technical scheme of the present invention is achieved like this: a kind of semi-automatic welding method of metal flux cored filler rod conduit root,
Comprise the preliminary treatment of the welding mouth of pipe; the welding of root bead layer; the welding of hot weld layer; packed layer welding and the welding of capping layer; its root bead layer welding is undertaken by following step: adopting metal powder core solder wire and short arc control technology is RMD; add protective gas and carry out the welding of pipeline all-position root pass; the welding condition of its root bead layer is as follows: adopt the semiautomatic welding downward welding technology; welding current 140A to 200A; weldingvoltage 15V to 18V; speed of welding 16cm/min to 26cm/min; wire feed rate is 350cm/min to 500cm/min; electrode extension is 8mm to 12mm; the amplitude of oscillation is as the criterion to the welding bead edge with weld metal deposition, and the deposited metal thickness of root bead layer is 3mm to 4mm.
Be further optimization and/or selection below to technique scheme:
Above-mentioned preliminary treatment is that the tube groove that needs weld is carried out groove processing and cleaning.
Above-mentioned tube groove is not for containing the outer root bead groove of inner liner, and its slope type can be double V-groove or compound double V-groove or compound U type groove.
Above-mentioned tube groove group to after group be 1.5mm to 2.5mm to the gap, the tube groove group to unfitness of butt joint should≤2.3mm, and ≯ 3mm, and should evenly distribute along the tube groove circumference.
Above-mentioned welding equipment is selected too Pulse MIG-500II FR of U.S. MillerPipepro450RFC or Austria for use; the E70C-6MH4/ Φ 1.2mm that welding wire selects for use U.S. Hao Baite company to produce; protective gas adopts mist; this mixed gases matching is 80% argon gas and 20% carbon dioxide gas; gas purity: argon gas 〉=99.96%, carbon dioxide gas 〉=99.5%, gas flow 18L/min to 25L/min.
Above-mentioned hot weld layer welding, packed layer welding and the welding of capping layer adopt medicine core self-shielded welding wire to carry out; its welding condition is as follows: equipment choosing U.S. Lincoln DC-400 or Austria is DC-500II type or bear paddy MPS500 too; welding wire is selected E81T8-Ni2J/ Φ 2.0mm for use; adopt the semiautomatic welding downward welding technology; welding current 190A to 250A; weldingvoltage 17V to 24V; speed of welding 17cm/min to 38cm/min; wire feed rate is 200cm/min to 300cm/min; electrode extension is 6mm to 20mm, and the amplitude of oscillation is as the criterion to the welding bead edge with weld metal deposition.
Should adopt eddy-current heating or electrically heated method that tube groove is preheated to 100 ℃ to 200 ℃ before above-mentioned welding, the preheating width is advisable to be not less than in each 50mm scope of tube groove both sides, and guarantees that preheat temperature is even; Interlayer temperature should be 50 ℃ to 150 ℃.
The concrete parameter of above-mentioned compound double V-groove is: going up bevel angle is 10 ° to 15 °, following bevel angle is 25 ° to 35 °, and change groove flex point is 10 ± 1mm apart from the height of inwall, and root face is 0.8mm to 1.5mm, the gap is 1.5mm to 2.5mm, and thickness of pipe wall is 18.4mm.
The invention solves the bottleneck difficult problem of restriction semi-automatic welding flowing water construction operation, can effectively solve problems such as undercut that the girth joint back of weld exists, depression, reduce welding bead removing surface cost, reduce labor strength, increase deposited metal thickness, reduce the welding number of plies, improve welding production efficiency greatly, obtain high-quality weld seam, speed of welding improves, can reduce by 1/3rd weld interval than manual welding, reduce operating cost.
Four, description of drawings:
Accompanying drawing 1 is the structural representation of double V-groove for one of tube groove of the present invention.
Accompanying drawing 2 is the structural representation of compound double V-groove for two of tube groove of the present invention.
Accompanying drawing 3 is the structural representation of compound U type groove for three of tube groove of the present invention.
Accompanying drawing 4 is the pipe joint project organization schematic diagram of the compound double V-groove of the present invention.
Accompanying drawing 5 is the pipe joint weld seam weld layer table structure schematic diagram of the compound double V-groove of the present invention.
Label in the accompanying drawing is respectively: 1 is the root bead layer, and 2 are the hot weld layer, and 3 to 7 for filling layer, and 8 is the capping layer; α is groove (or down groove) angle, and β is last bevel angle, and H is for becoming the height of groove flex point apart from inwall, and R is groove 1/4 arc radius down, and δ is a thickness of pipe wall, and p is a root face, and b is the gap, and h is the face of weld reinforcement, and W is the cap weld width.
Five, the specific embodiment:
The present invention is not subjected to the restriction of following embodiment, can determine concrete embodiment according to the technical scheme and the actual conditions of the invention described above.
Below in conjunction with most preferred embodiment the present invention is done further argumentation:
This semi-automatic welding method of metal flux cored filler rod conduit root is undertaken by following step: it comprises the preliminary treatment of the welding mouth of pipe; the welding of root bead layer; the welding of hot weld layer; packed layer welding and the welding of capping layer; its root bead layer welding is undertaken by following step: adopting metal powder core solder wire and short arc control technology is RMD; add protective gas and carry out the welding of pipeline all-position root pass; the welding condition of its root bead layer is as follows: adopt the semiautomatic welding downward welding technology; welding current 140A to 200A; weldingvoltage 15V to 18V; speed of welding 16cm/min to 26cm/min; wire feed rate is 350cm/min to 500cm/min; electrode extension is 8mm to 12mm; the amplitude of oscillation is as the criterion to the welding bead edge with weld metal deposition, and the deposited metal thickness of root bead layer is 3mm to 4mm.
Can according to actual needs above-mentioned semi-automatic welding method of metal flux cored filler rod conduit root be made further optimization and/or improvements:
Shown in accompanying drawing 1 to 4, above-mentioned preliminary treatment is that the tube groove that needs weld is carried out groove processing and cleaning; Tube groove is not for containing the outer root bead groove of inner liner, and its slope type can be double V-groove or compound double V-groove or compound U type groove; The tube groove group to after group be 1.5mm to 2.5mm to the gap, the tube groove group to unfitness of butt joint should≤2.3mm, and ≯ 3mm, and should evenly distribute along the tube groove circumference; Tube groove the best can be compound double V-groove, the best concrete parameter of this compound double V-groove is: going up bevel angle β is 10 ° to 15 °, following bevel angle α is 25 ° to 35 °, change groove flex point is 10 ± 1mm apart from the height H of inwall, root face p is 0.8mm to 1.5mm, gap b is 1.5mm to 2.5mm, and thickness of pipe wall δ is 18.4mm.
In the present invention; above-mentioned welding equipment the best is selected too PulseMIG-500 IIFR of PipePro 450RFC that U.S. Miller company produces or Austria for use; the E70C-6M H4/ Φ 1.2mm that welding wire selects for use U.S. Hao Baite company to produce; protective gas adopts mist, and this mixed gases matching is 80% argon Ar+20% carbon dioxide CO
2, gas purity: argon Ar 〉=99.96%, carbon dioxide CO
2〉=99.5%, gas flow 18L/min to 25L/min.
In the present invention; above-mentioned hot weld layer welding; the best medicine core self-shielded welding wire that adopts of packed layer welding and the welding of capping layer carries out; its welding procedure optimal parameter is as follows: equipment choosing U.S. Lincoln DC-400 or Austria is DC-500II type or bear paddy MPS500 too; welding wire is selected E81T8-Ni2J/ Φ 2.0mm for use; adopt the semiautomatic welding downward welding technology; welding current 190A to 250A; weldingvoltage 17V to 24V; speed of welding 17cm/min to 38cm/min; wire feed rate is 200cm/min to 300cm/min; electrode extension is 6mm to 20mm, and the amplitude of oscillation is as the criterion to the welding bead edge with weld metal deposition.
In the present invention, should adopt eddy-current heating or electrically heated method that tube groove is preheated to 100 ℃ to 200 ℃ before the above-mentioned welding, the preheating width is advisable to be not less than in each 50mm scope of tube groove both sides, and guarantees that preheat temperature is even; Interlayer temperature should be 50 ℃ to 150 ℃.
In the present invention: the percentage of gas all is percent by volume.
In the present invention, except abovementioned technology, other technical measures can adopt existing routine techniques in the art.As: RMD is meant existing known short arc control technology, and it to the short circuiting transfer precision Control Technology, can in time change welding current and voltage as a kind of by detecting the short circuit current time of origin, becomes a kind of dynamic control technology; The semiautomatic welding downward welding technology also is the existing known technology that adopts.
Above technical characterictic has constituted most preferred embodiment of the present invention, and it has stronger adaptability and best implementation result, can increase and decrease non-essential technical characterictic according to actual needs, satisfies the demand of different situations.
Most preferred embodiment of the present invention is as follows:
The first step: groove processing.The steel pipe material is selected the X80 steel for use, caliber ￠ 1219 * 18.4mm, and slope type is selected compound double V-groove for use, and groove type is as shown in Figure 2.β＝10°～15°，α＝25°～35°，H＝10±1mm，p＝0.8～1.5mm，b＝1.5～2.5mm，δ＝18.4mm。All pipe end grooves must adopt mechanical means processing, and the finished edge end face must be smooth, even, smooth.
Second step: pipe end cleaning.Soldered surface should be even, smooth, the delamination that do not have, wearing and tearing, iron rust, slag dirt, grease, paint and influence other harmful substance of welding quality.Before welding, should adopt mechanical means to clear up to presenting metallic luster in each 25mm scope of mouth of pipe surfaces externally and internally groove both sides.
The 3rd step: mouth of pipe group is right.Should preferentially adopt the internal clamp group right.When using internal clamp, should not stay indentation, polishing scratch and greasy dirt at steel pipe internal-surface to mouthpart.Steel pipe to the time should not knock steel pipe two ends.Mouth of pipe group is answered≤2.3mm unfitness of butt joint, and ≯ 3mm, and should evenly distribute along mouth of pipe circumference.The bevel angle that the pipe joint group is right, root face, group should meet requirement among Fig. 4 to the gap equidimension.
The 4th step: welding step.The welding number of plies of pipe joint weld seam as shown in Figure 5.1 is the root bead layer among the figure, and 2 are the hot weld layer, and 3～7 for filling layer, and 8 is the capping layer.
1, checks before the weldering.(1) root bead equipment choosing PipePro 450RFC, hot weld, filling weldering, cosmetic welding equipment choosing bear paddy MPS500; (2) the root bead welding wire is selected E70C-6M H4/ Φ 1.2mm for use, and protective gas is selected 80% argon Ar+20% carbon dioxide CO for use
2Mixed air, gas purity argon Ar 〉=99.96%, carbon dioxide CO
2〉=99.5%, hot weld, filling weldering, cosmetic welding welding wire are selected E81T8-Ni2J/ Φ 2.0mm for use.
Whether each rotary switch such as checkout facility, indicating meter, switch, electric power polarity puts in place, and whether circuit connects, and whether the appendix joint tightens, and whether the welding gun connector is loosening, and whether ignition tip is tightened, and commissioning device guarantees that welding circuit is normal; Check gas cylinder, argon Ar table, carbon dioxide CO
2Table and air inlet pipe guarantee the unimpeded and gas pressure stability of gas circuit.
2, welding operation.Should adopt eddy-current heating or electrically heated method with pipe end preheating to 100 ℃～200 ℃ before the welding, the preheating width is advisable to be not less than in each 50mm scope of groove both sides, and should guarantee that preheat temperature is even; Interlayer temperature should be 50 ℃～150 ℃.
(1) root bead layer welding, its welding condition is as follows: equipment choosing PipePro 450RFC, welding wire is selected E70C-6MH4/ Φ 1.2mm for use, adopt the semiautomatic welding downward welding technology, welding current 140A～200A, weldingvoltage 15V～18V, speed of welding 16cm/min～26cm/min, wire feed rate is 350cm/min～500cm/min, electrode extension is 8mm～12mm, the amplitude of oscillation is as the criterion to the welding bead edge with weld metal deposition, and deposited metal thickness is 3mm～4mm, and mixed gases matching is 80% argon Ar+20% carbon dioxide CO
2, gas purity argon Ar 〉=99.96%, carbon dioxide CO
2〉=99.5%, gas flow 18L/min～25L/min.
(2) hot weld layer welding, its welding condition is as follows: equipment choosing bear paddy MPS500, welding wire is selected E81T8-Ni2J/ Φ 2.0mm for use, adopt the semiautomatic welding downward welding technology, welding current 190A～250A, weldingvoltage 17V～24V, speed of welding 17cm/min～38cm/min, wire feed rate is 200cm/min～300cm/min, and electrode extension is 6mm～20mm, and the amplitude of oscillation is as the criterion to the welding bead edge with weld metal deposition.
(3) packed layer welding, its welding condition is as follows: equipment choosing bear paddy MPS500, welding wire is selected E81T8-Ni2J/ Φ 2.0mm for use, adopt the semiautomatic welding downward welding technology, welding current 190A～250A, weldingvoltage 17V～24V, speed of welding 17cm/min～38cm/min, wire feed rate is 200cm/min～300cm/min, and electrode extension is 6mm～20mm, and the amplitude of oscillation is as the criterion to the welding bead edge with weld metal deposition.
(4) capping layer welding, its welding condition is as follows: equipment choosing bear paddy MPS500, welding wire selects for use E81T8-Ni2J/ Φ 2.0mm to adopt the semiautomatic welding downward welding technology, welding current 190A～250A, weldingvoltage 17V～24V, speed of welding 17cm/min～38cm/min, wire feed rate is 200cm/min～300cm/min, electrode extension is 6mm～20mm, and the amplitude of oscillation is as the criterion to the welding bead edge with weld metal deposition.
Adopt the inventive method and affiliated welding condition that the above-mentioned mouth of pipe is welded, according to standard Q/SYGJX0110-2007 " transfering natural gas from the west to the east two wires pipeline engineering circuit solder technology standard " requirement, the Interventions Requested of banjo fixing butt jointing are: visual examination, RT detect and mechanical property test.
Check result shows: weld appearance shaping uniformity defectives such as crackle, incomplete fusion, pore, slag inclusion, depression do not occur on weld seam and near the surface thereof; The cap weld width W increases 0.5mm～2.0mm than the every side of outer surface groove width, unfitness of butt joint≤1/8 δ, and face of weld reinforcement h is between 0mm～2mm, and the undercut degree of depth is between 0.2mm～0.5mm; After visual examination is qualified, carries out RT and detect, meet the requirement of " transfering natural gas from the west to the east two wires pipeline engineering Non-Destructive Testing " ray standard; After the RT detection is qualified, carry out mechanical property test again, all requirements of accord with Q/SY GJX0110-2007 standards such as its tension test, the disconnected test of cutting hammer, bend test, low-temperature impact test, macroscopical metallographic, hardness test.
In sum, the present invention can be widely used in the pipeline flowing water weld job that caliber is not less than 300mm, and its beneficial effect is as follows:
1, the present invention can change present manual welding root bead technology based on SMAW, improved the root bead speed of welding, solved the bottleneck of restriction semi-automatic welding flowing water construction operation, improved operating efficiency greatly, the welding number of plies reduces, speed of welding improves, and can reduce by 1/3rd weld interval than manual welding, has reduced operating cost.
2, adopt the present invention to realize the root pass semi-automatic welding, obviously reduced welding point, thereby reduce the probability that weld defect produces, guarantee that welding quality stable is reliable.
When 3, adopting the present invention to weld, the molten bath is stable in welding process, easily produces big fusion penetration at root, and the fusion of weld seam both sides is good, effectively solved problems such as the undercut that the girth joint back of weld exists, depression, can guarantee that face of weld (positive, the back side) is smooth, moulding is attractive in appearance.
4, adopt the present invention obviously to reduce welding bead removing surface cost, reduced labor strength, realized welding procedure safety, purpose efficiently.
5, the present invention be suitable for mouth of pipe group to after slope type can be double V-groove or compound double V-groove or compound U type groove.
Claims (5)
1. semi-automatic welding method of metal flux cored filler rod conduit root, comprise the preliminary treatment of the welding mouth of pipe, the welding of root bead layer, the welding of hot weld layer, packed layer welding and the welding of capping layer, it is characterized in that root bead layer welding undertaken by following step: adopting metal powder core solder wire and short arc control technology is RMD, add protective gas and carry out the welding of pipeline all-position root pass, the welding condition of its root bead layer is as follows: adopt the semiautomatic welding downward welding technology, welding current 140A to 200A, weldingvoltage 15V to 18V, speed of welding 16cm/min to 26cm/min, wire feed rate is 350 cm/min to 500cm/min, electrode extension is 8 mm to 12mm, the amplitude of oscillation is as the criterion to the welding bead edge with weld metal deposition, and the deposited metal thickness of root bead layer is 3mm to 4mm; Wherein, adopt eddy-current heating or electrically heated method that tube groove is preheated to 100 ℃ to 200 ℃ before the welding, the preheating width to be being not less than each 50mm of tube groove both sides, and guarantees that preheat temperature is even; Interlayer temperature should be 50 ℃ to 150 ℃; Preliminary treatment is that the tube groove that needs weld is carried out groove processing and cleaning; Tube groove is not for containing the outer root bead groove of inner liner, and its slope type can be double V-groove or compound double V-groove or compound U type groove; The tube groove group to after group be 1.5 to 2.5mm to the gap, the tube groove group to unfitness of butt joint should≤2.3mm, and should evenly distribute along the tube groove circumference.
2. semi-automatic welding method of metal flux cored filler rod conduit root according to claim 1; it is characterized in that in the welding of root bead layer; welding equipment is selected too Pulse MIG-500 II FR of U.S. Miller Pipepro 450RFC or Austria for use; the E70C-6M H4/ Φ 1.2mm that welding wire selects for use U.S. Hao Baite company to produce; protective gas adopts mist; this mixed gases matching is 80% argon gas and 20% carbon dioxide gas; gas purity: argon gas 〉=99.96%, carbon dioxide gas 〉=99.5%, gas flow 18 L/min to 25L/min.
3. semi-automatic welding method of metal flux cored filler rod conduit root according to claim 1 and 2; it is characterized in that the welding of hot weld layer; packed layer welding and the welding of capping layer adopt medicine core self-shielded welding wire to carry out; its welding condition is as follows: equipment choosing U.S. Lincoln DC – 400 or Austria is DC-500 II type or bear paddy MPS500 too; welding wire is selected E81T8-Ni2J/ Φ 2.0mm for use; adopt the semiautomatic welding downward welding technology; welding current 190A to 250A; weldingvoltage 17V to 24V; speed of welding 17cm/min to 38cm/min; wire feed rate is 200 cm/min to 300cm/min; electrode extension is 6 mm to 20mm, and the amplitude of oscillation is as the criterion to the welding bead edge with weld metal deposition.
4. semi-automatic welding method of metal flux cored filler rod conduit root according to claim 1 and 2, the concrete parameter that it is characterized in that compound double V-groove is: going up bevel angle β is 10 ° to 15 °, following bevel angle α is 25 ° to 35 °, change groove flex point is 10 ± 1mm apart from the height of inwall, root face is 0.8mm to 1.5mm, the gap is 1.5mm to 2.5mm, and thickness of pipe wall is 18.4mm.
5. semi-automatic welding method of metal flux cored filler rod conduit root according to claim 3, the concrete parameter that it is characterized in that compound double V-groove is: going up bevel angle β is 10 ° to 15 °, following bevel angle α is 25 ° to 35 °, change groove flex point is 10 ± 1mm apart from the height of inwall, root face is 0.8mm to 1.5mm, the gap is 1.5mm to 2.5mm, and thickness of pipe wall is 18.4mm.
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