CN1171316A - CO2 gas protected semi-automatic vertical and\or vertical scarf welding technology - Google Patents
CO2 gas protected semi-automatic vertical and\or vertical scarf welding technology Download PDFInfo
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- CN1171316A CN1171316A CN 96107082 CN96107082A CN1171316A CN 1171316 A CN1171316 A CN 1171316A CN 96107082 CN96107082 CN 96107082 CN 96107082 A CN96107082 A CN 96107082A CN 1171316 A CN1171316 A CN 1171316A
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Abstract
A CO2 gas protected semi-automatic vertical and/or vertical scarf welding technology features that based on the CO2 gas protected semi-automatic downhand or flat-position welding, that is, use of their semi-automatic welding wire and gas feeding function, the welding parameters and welding operation techniques are regulated, such as longer welding wire feed and higher flow of protecting gas to ensure the protection of gas to molten metal. Said technology is suitable to weld ultra-thick (130 mm) steel plate with high-quality weld.
Description
The present invention relates to CO
2The gas shield solder technology, particularly a kind of CO
2Semi-automatic vertical position welding of gas shield and/or oblique vertical position welding technology.
CO
2Gas shield semi-automatic welding method is the source of welding current with the direct current, combines in the process of carrying out the member welding in the effect with filler and electrode, is used CO
2Gas is to forming about 1000mm around molten bath and the molten bath
2Air tube of bamboo in granary, cover and treat solder joint, with protection electric arc and molten metal.At present, general CO
2The gas shield semiautomatic welding mainly is applicable to " downhand welding of bowing " and " horizontal horizontal position welding " these two kinds of welding processes.These two kinds of weldering methods have welding current and the comparatively constant characteristics of arc voltage, make it show that speed of welding is fast, weldquality good, be suitable for the big advantages such as operation process of welding job amount.On the other hand, also the speed just because of these two kinds of welding methods is exceedingly fast, but is by Artificial Control and operation, so operating process can not be too complicated, particularly still can not adapt to the welding of weld seams such as vertical vertical position welding, inclination vertical position welding.Before the invention of this technology, when meeting, if adopt the CO of standard such as situations such as vertical vertical position welding, inclination vertical position welding, angle overhead welding, angle vertical position weldings
2Electrogas process, then there are the following problems: 1). and welding wire often touches the molten bath, so that interrupts welding; 2). the deposite metal easily drops into knurl; 3). because of the hot and cold air inside and outside the vertical position welding weld groove flows, cause air tube of bamboo in granary distortion and displacement, cause the molten bath and can not get effective protection, the pore growing amount is big; 4). easily be stained with sticking splashing in the gas shiled sleeve, gas circuit is obstructed seriously, is difficult to smooth fortune weldering in dark narrow groove, and the operator is difficult for directly observing the welding overall process; 5). easily form weld seam middle part drum flange indentation, be prone to slag stringer and incomplete fusion, easily form the molten bath and disconnect.
People proposed multiple solution of the above problems already respectively.CN93241469.9 proposes a kind ofly to pile up in order to control spatter and weldering meat, with the shaping that improves weld seam and the carbon dioxide gas arc welding droplet transfer control device of quality.And for example the push-pull short circuit transition welding method and the pulsating solder wire feeder thereof of CN85100690 proposition make the selection of welding conditions not be subjected to the restriction of droplet transfer, can reduce and splash, and improve to be shaped, and improve deposition efficiency.The sliding pliers pulsating silk machine that CN8510691 advised for another example helps to guarantee the accurate advance and retreat of each step of periodically pulsing wire feed process.Yet the scheme of all these suggestions is not all clearly pointed out can be used to vertical position welding and tiltedly vertical position welding operation, particularly unresolved CO
2Gas shield is applicable to the vertical position welding or the oblique vertical position welding problem of large-scale weldment effectively.
Directly at CO
2The well known materials of gas shield vertical position welding or oblique vertical position welding technology is found in as U.S. Pat 4,292,496, wherein discloses the riser welding method of the employing diclinic weld seam of people such as M.G.Hoy invention, and this proposes at thick plates.Described as this article, the known practice of improving thick plates strengthens welding current or reduces speed of welding etc. such as adopting special weld seam (as single or double U, V, X and single V groove with root face).The method of this patent promptly at such as aluminium and aluminium alloy thick plate (about 3.8cm) arc welding, selects welding current at 290-420A, and proposes to adopt under inert gas (as pure argon gas) protection the riser welding procedure of diclinic seam.But the essence of this method is the weld bond toughness that is conceived to improve when welding such as aluminium alloy, and does not take into account how to guarantee speed of welding, does not particularly provide the practical parameter that is applicable to the steel plate welding.Though Chinese patent CN94114847.5 relates to large-scale workpiece, " scene " welding method as disc type water-wheel generator rotor support, provide the fit system of relevant welding parameter, but the operating type essence of this method is considered by factory's formula condition, promptly diameter is surpassed 10 meters, steel plate thickness only at 30 meters ultra-large workpiece, under about 24V weldingvoltage condition, only about 130A, its speed of welding is only at about 160mm/min for used welding current.Adopt such as balanced welding, the assembly welding measures such as weldering, skip welding that intersect as for proposing, purpose but only is at described special weldment, for reducing welding stress, disc face contraction and distortion.U.S. Pat 3,732,393 disclosed Arc Welding Process are applicable to the jam weld of clean steel plate and/or low alloy steel plate, particularly a kind of consumable welding wire, at CO
2Gas or contain CO
2(18%) weld the position of facing upward under the mixed gas protected condition, and used gage of wire 0.2-1.2mm is at 300-400A/mm
2During current density, weldingvoltage is got 25-40V, adopts the X weld seam, and the weld seam A/F should be 4-5mm, and its path of welding is controlled.This article propose to make wire-electrode with by the angle of weldering plate face between 80 °-100 °, will help generating weak point and welding arc stably.Yet this technology all has higher requirements to speed of welding, the depth of weld and wire melting ability.The semiautomatic welding termination process of Artificial Control operation can't be applicable to, more on-the-spot installation exercise can not be adapted to, the particularly changeable requirement of weld seam Type of Welding.
The objective of the invention is to propose a kind of processes such as being used for vertical vertical position welding, inclination vertical position welding, angle overhead welding, angle vertical position welding that can adapt to widely, be specially adapted to slab, ultra-thick plate are implemented CO
2The method of gas shield semi-automatic welding, to guarantee the welding process stable and controllable, smooth welded seam is orderly and the rate of climb is even, guarantees CO
2Gas obtains the welding soldering tip of good mechanical property to effective protection in electric arc and molten bath.
For achieving the above object, the present invention proposes a kind of CO
2Semi-automatic vertical position welding of gas shield and/or oblique vertical position welding welding procedure, it may further comprise the steps: weldment (mother metal) is carried out checking before the routine weldering, and carry out environment maintenance and equipment debugging; Carry out the weldment group to and weldment cleaning, and the solid liner plate of point and introducing, end tab; Mother metal is simulated test weld outward, checks, checks and adjust vertical position welding and/or oblique vertical position welding welding welding parameter; Weldment is carried out the preceding heating schedule of weldering; Vertical position welding and/or oblique vertical position welding welding parameter by this law are welded with the operation skill and technique, wherein adopt the wire feed and the CO of welding wire
2The automatic feed of protective gas; Welding point is kept away capable postwelding after-baking by rules; Slab and ultra-thick plate are carried out the strict insulation in heat affected area after weld seam is finished.
The invention described above CO
2The semi-automatic vertical position welding of gas shield the and/or tiltedly welding parameter of vertical position welding is as follows: use the welding wire trade mark as YM-26, the condition of gage of wire as 1.2mm under; first floor welding arc voltage is not more than 23V; welding current must be not more than 200A, electrode extension between 30-35mm, used CO
2Gas flow is not less than 55L/min; The welding arc voltage of second layer is 23-25V, and welding current adopts 200-220A, and electrode extension is controlled at 25-30mm, CO
2Gas flow is controlled between 45-55L/min; Corresponding each parameter of the 3rd layer is divided: arc voltage is 25-27V, welding current 220～250A, electrode extension 25～30mm, CO
2Gas flow 45～55L/min; Each layer is answered the shunting welding later on, and relevant parameter is respectively: arc voltage is 25-27V, welding current 220～250A, electrode extension 20～25mm, CO
2Gas flow 35～45/min.
Above-mentioned welding parameter and other parameter see the following form 1:
Table 1
| The welding level | Welding wire | Welding current A | Arc voltage V | Electrode extension mm | ?CO 2Gas flow L/min | Speed of welding cm/s | Interlayer temperature ℃ | Weld polarity | |
| The trade mark | Diameter phi | ||||||||
| The 1st layer | ??YM ??↓ ??26 | ?1.2mm | ??≤200 | ??≤23 | ??30-35 | ??≥55 | ≥0.5 | ????150 | ↓ anode ↑ |
| The 2nd layer | ?1.2mm | ??200-220 | ??23-25 | ??25-30 | ??45-55 | ??0.52 | ????150 | ||
| The 3rd layer | ?1.2mm | ??220-250 | ??25-27 | ??25-30 | ??45-55 | ??0.55 | ????150 | ||
| Each layer shunting weldering later on | ?1.2mm | ??220-250 | ??25-27 | ??20-25 | ??35-45 | ??0.55 | ????150 | ||
Listed parameter cooperation is applicable in the table---
Weldment material: 15MnV, 16Nn, 15MnNR, A36, A572～42W, A572～50
Welded piece material thickness: δ=25-130mm
Bevel angle: α=30 ° (to monolateral V-belt liner plate groove weld)
Fusion length: L 〉=300mm
Gap, the end is about: C 〉=10mm
Use this law, required welding surroundings is for prohibiting rain, and wind speed is less than 2m/s, and relative humidity is less than 70%.
Above-mentioned slab and ultra-thick plate respectively refer to the structural steel and iron class mother metal of thickness range between 20mm-60mm and 60m-100m.
For guaranteeing weldquality, CO of the present invention
2Semi-automatic vertical position welding of gas shield and/or oblique vertical position welding method also must cooperate and use following welding skill and technique in regular turn except that adopting above-mentioned technological parameter:
(1) pressure welding: press down welding gun mouth (promptly pressing down electric arc) by edge (as the A place among Fig. 1 and 2) in the groove side, make the welding wire of former maintenance level become the downward inclination angle in high about 5-10 ° of the low and welding wire exit of electric arc, and do 0.5 second short stay, be able to fullly so that extend the molten bath come, and guarantee to fill metal and base metals good metallurgical chemical combination in the groove side from the straight flange side;
(2) choose weldering: be right after above-mentioned pressure welding action, almost (being Fig. 1,2 and 3 A place) is partial to the related electric arc of muzzle the straight flange of weld groove still in the original place of above-mentioned pressure welding action, make welding wire and straight flange keep being about 15 ° of angles, the operator does amplitude upward with muzzle and electric arc rapidly, and to be that 3.5-4mm is gently and fast oblique provoke, make the molten bath rise to the height of about 3.5-4mm, and begin the fortune weldering of next chain;
(3) tape welding: the welding wire that rises to and rise in the process in the molten bath of continuing has become and points to straight flange and form 15 ° of angles, the operator need keep the weld seam bed thickness to be not more than 6mm, the high about 3.5mm of weld ripples at the uniform velocity transports weldering (as the A-B section in Fig. 1 and 4) fast to the straight flange side, forms narrow and long molten bath.Simultaneously, electric arc is to direct reach straight flange side (as the C place among the above-mentioned figure) than the amplitude of advancing of the leading 10-15mm of long narrow molten bath trailing edge;
(4) change weldering: along with the action of above-mentioned " carrying a gun ", in case electric arc arrives near the straight flange side of weld groove, the operator rotates electric arc, be about " drawing circle " action (as the C-D section in Fig. 1 and 4) of 5mm as diameter, stir the molten bath of arriving at straight flange by electric arc, weld bond straight flange mother metal is fully fused with filling metal, both can eliminate in the straight flange side anterior layer weldering meat and may conceal the defective of depositing, also make straight flange face down bonding meat full all the time and be higher than the about 3-3.5mm of groove side, satisfy arts demand.This move can also make welding wire regular meeting exist the moment of torsion that forms in the crooked wire-feeding pipe to chew the exit in conduction and be released, thereby can avoid ejecting harm because of welding wire reverses contingent molten drop usually;
(5) drag weldering: finish change the weldering action after, welding wire recovers level, the form that becomes 15 ° of angles with welding wire with the straight flange side is dragged sloping avris backstep welding to weld groove with electric arc from weld groove straight flange side, gets back to the A place in Fig. 1 and 5.This action is intended to delay molten bath surging to sloping avris by blow force of arc.In this process, need make electric arc " be sent " (as E place among Fig. 1) before the post-tensioning continuously, make the volume of the metal that solidifies gradually form the straight flange side greater than sloping avris.Can satisfy the vertical position welding process of vertical position welding/tiltedly the weld groove straight flange side that should accomplish be higher than sloping avris 3-3.5mm all the time, the specification requirement of indentation does not appear in even rising of weld ripples and edge, and can make each weld ripples melt run obtain revising, per pass weldering meat thickness is even, weld seam face attractive in appearance is shaped finally to obtain every layer.
Finish the operation cycle of the layer weld seam that rises with this, and the weld cycle of the new same sequence that continues.
Above-mentioned five kinds of welding skill and technique must be connected in regular turn, link up and carry out, and are called " five word skill and technique ".
Adopt CO of the present invention
2Gas shield semi-automatic welding technology is used for weld jobs such as the vertical position welding of slab, ultra-thick plate, oblique vertical position welding, and its technical advantages comprises:
1. demonstrate fully CO
2The fireballing advantage of gas shield semi-automatic welding method under the same operating mode, is 4 times of manual electric arc welding speed of welding, single rifle day workload can surpass 160 linear meters, increase work efficiency greatly, and then the reduction expense cost;
2. be beneficial to very much step raising welding quality.This law gained weld seam has the very obvious effects that interlayer weldering meat is smooth, the fusion of each layer weld edge is good, compare with manual electric arc welding, adopt this technology gained welding point qualification rate can reach 100%, 10-15 when particularly being manual electric arc welding owing to the used arc density of this technology doubly, the molten bath reaches 7-8mm deeply, can make slag inclusion incomplete fusion defective in the described joint exist probability to reduce to be about zero, acceptance rate reaches 90%;
3. adopt this technology, fast because of its speed of welding, easily keep the required interlayer temperature of weldering knot, thereby the heat affected area of whole welding joints is less, can make speed of welding fast.This law also can reduce the number of times of interlayer scarfing cinder, helps further improving speed of welding; More can slow down the transition process that changes over tension in the slab deep groove weld seam welding process along the compression of thickness of slab direction generation, control the generation of hot and cold crackle effectively;
4. for same weld seam, the joint rate that adopts this technology to produce only is 1/20 of a manual electric arc welding situation;
5. the inventive method has advantages such as extensive applicability.This law can be used for butt joint vertical position welding, corner connection vertical position welding, T that gap at the bottom of material thickness δ 〉=20mm, the groove is not less than the structural steel belt material plate of 5mm and connects vertical position welding; Also can be used for the oblique vertical position welding of oblique vertical position welding, corner connection, T that gap at the bottom of material thickness δ 〉=20mm, the groove is not less than the structural steel belt material plate of 5mm and connect oblique vertical position welding.Adopt this law stand to or tiltedly upright during to welding, best welding bed thickness is not more than 7mm, molten bath the best wide cut is not more than 25mm.
Adopt CO of the present invention
2Semi-automatic vertical position welding of gas shield and/or oblique vertical position welding welding procedure can be the structural steel steel plate enforcement welding of 130mm to maximum ga(u)ge.
With reference to the accompanying drawings, and pass through specific embodiment, CO of the present invention is described in further detail
2Semi-automatic vertical position welding of gas shield and/or oblique vertical position welding welding procedure, wherein:
Figure 1A and Figure 1B be the expression invention semi-automatic vertical position welding of CO gas shield and/or tiltedly the used pressure of vertical position welding welding procedure choose band and change and drag five word skill and technique to transport the weldering schematic diagram continuously;
Fig. 2 represents pressure welding fortune weldering schematic diagram in the five word skill and technique;
Fig. 3 represents to choose in the five word skill and technique weldering fortune weldering schematic diagram;
Fig. 4 represents tape welding fortune weldering schematic diagram in the five word skill and technique;
Fig. 5 represents five word skill and technique transfers weldering fortune weldering schematic diagram;
Fig. 6 represents to drag in the five word skill and technique weldering fortune weldering schematic diagram.
Embodiment one (one) weldment inspection
Get two vertical position welding test specimens, be numbered A, B weldment respectively.Described weldment material (contains main part A, B and annex (liner plate; Introduce, end tab)) be A572-42W.Described test specimen specification:
Weldment A, B (loose mail): 300mm * 900mm * 60mm
Liner plate: 8mm * 60mm * 1000mm
Lead in/out plate: 8mm * 65mm * 50mm (two) welding requirements, welding equipment, parameter and operating mode
The weldment group is to back specification: 610mm * 900mm * 60mm
Weldment joint form: butt joint
Position while welding: vertical vertical position welding
Weld seam form: single face double V-groove, root backing, root gap 〉=10mm
Weld seam total length 1000mm (containing introducing, each 50mm of extension)
Groove angle α=30 °
Welding material: (1) welding wire-trade mark YM-26; Diameter phi 1.2
(2) CO
2Gas: purity 〉=99.5%
Bonding machine/utensil: (1) rectifier type multifunctional welding machine
(2) wire-feed motor
(3) gas cylinder
(4) gas flowmeter
(5) welding gun assembly, and
(6) control line, tracheae, welding cable.
Welding surroundings: the same day meteorology: cloudy; Temperature: 29 ℃; Wind-force:＜2 grades of welding are encircled for protection: windproof anti-
Rain is gone along with sb. to guard him.(3) welding procedure step:
(1) check before the weldering: 1. the groove group is to no misalignment, and tack welding is all in back liner plate and main part joint place;
2. introduce, that end tab is pieced together the angle is identical with the main weld form, elongated portion is 50mm;
3. root gap evenly keeps 10mm; Face seam width: A=44mm B=44mm meets
The workpiece group is to requiring.
4. groove is inside and outside cleans, no dirt, corrosion, and sloping limit otch is neat.
(2) welding operation:
Weldment heating: vertically heat 150 ℃ along groove both sides 100mm;
First floor welding
1. welding parameter is selected as follows:
Welding wire polarity: sun
Arc voltage: 20-23 (V) (according to field condition, suggestion gets the small value)
Welding current: 180-200 (A) (according to field condition, suggestion gets the small value)
Electrode extension: 30-35 (mm) (according to field condition, big value is got in suggestion)
CO
2Gas flow: 55L-60 (L/min) (according to field condition, big value is got in suggestion)
Bed thickness: be not more than 7 (mm)
2. technological requirement: the weld seam length overall is divided into three sections of 250mm (comprising end tab), 300mm, 450mm (comprising lead-in plate), takes the backstep mode to implement welding.
1) I, II, every section beginning weldering place of III section should be controlled bed thickness and be not more than 5mm, L 〉=40mm;
When 2) the I section finishes to weld gradually, end tab partly must have been welded by formal weld seam;
When 3) II section and I section beginning weldering section engages, should be by first floor even weld, and the requirement that is not more than 7mm is the about 40mm length of I section beginning weldering place, and only 5mm section melting welding again of bed thickness, super thickness portion employing carbon arc air gouging is repaiied;
4) beginning weldering place of III section must connect lead-in plate formal weld seam welding, and welding requirements is with 3 when engaging with beginning weldering place of II section);
5) this weldering example with the weld seam backstep, fails to satisfy the continuous weldering ability of present technique for to satisfy the technological requirement that welding point should evenly expand with heat and contract with cold as far as possible in the operation.
3. the first floor welds skill and technique: the first floor welding and the second layer and the 3rd layer of comparison, and section of weld joint is long-pending minimum, and this weldering method can continuously be supplied with welding required welding wire and gas automatically by machinery.Also just because of this feature, the operator must adapt to CO as far as possible
2The fireballing advantage of gas shield semiautomatic welding, and because CO
2Welding gun is difficult to freely operate in dark and narrow groove, and it is extremely short again to form the required time of each weldering slope, and present technique acts on the first floor welding bead of vertical vertical position welding, only adopts pressure welding, chooses weldering, commentaries on classics welds three kinds of skill and technique and circulated in proper order and can finish the welding needs.1. sublevel welds welding parameter and selects as follows: arc voltage: 23-25 (V) (according to field condition, suggestion gets the small value) welding current: 200-220 (A) (according to field condition, suggestion gets the small value) CO
2Gas flow: 45L-55 (L/min) is (according to field condition, big value is got in suggestion) welding extension elongation: 30-35 (mm) (according to field condition, big value is got in suggestion) bed thickness: 7 (mm) interlayer temperature: 150 ℃ of 2. welding process requirement: full welding bead is divided into 350mm (containing end tab), two sections backstep weldings of 650mm (containing lead-in plate).3. operate skill and technique: the welding of the second layer increases less than first floor weld seam wide cut, and the operation skill and technique is still as first floor requirement.4. hints on operation: 1) keep about 150 ℃ of layer jointing temp;
2) electric arc lead in/out plate all should be according to the welding of formal weld seam.Emphasis guarantees that the section of drawing bed thickness is not little
In 7mm, prevent from successively to produce to reduce to draw place's section weld seam by the road; Prevent from receiving the hasty blow-out of arc stage,
Remove muzzle ahead of time, and form pore;
3) postwelding scarfing cinder is rejected and is splashed and vaporific attachment.
The 3rd layer of welding
1. welding parameter is selected:
Arc voltage: 25-27 (V) (according to field condition, suggestion gets the small value)
Welding current: 220-250 (A) (according to field condition, the suggestion amount gets the small value)
Electrode extension: 25-30 (mm) (according to field condition, big value is got in suggestion)
CO
2Gas flow: 45L-55 (L/min) (according to field condition, big value is got in suggestion)
Interlayer temperature is more than or equal to 150 ℃
Bed thickness is smaller or equal to 7 (mm)
2. technological requirement: full weld seam is divided into 250mm (containing end tab), 400mm, 350mm (containing lead-in plate)
Three sections, backstep.Purpose is to rise with second layer welding line joint place is wrong, and keeps full weld seam temperature
Degree evenly distributes, and the joint process is still as first floor requirement.
3. operate skill and technique: this layer weld width has been fit to freely transports weldering, and is required to be the succeeding layer road and provides smooth
Aspect.For avoiding occurring the first floor and second layer CO
2The semi-automatic cross joint welding process of gas shield
In place, the sloping limit weldering meat weakness that is prone to, the easy thick collection of straight flange place weldering meat, even weld seam occurs and can not put down
The steady rising repaired the generation of weld defects such as weld seam to such an extent as to have to stop, and this level is necessary
Consecutive order by five word skill and technique of the present invention is implemented welding.
The variation such as the table 1 of the welding parameter of later each level welding, and all should be by the explanation implementation and operation of front five word skill and technique.
After above-mentioned A, B weldment adopt the inventive method and described technological parameter to require welding, gained visual examination of weld result such as table 2:
Table 2 (long measure: mm)
| Test piece number | Material thickness δ | The amount of increasing | The postwelding seam is wide | The undercut degree of depth | The undercut length overall | Angular deformation |
| ????A | ????60 | ??0-4 | ??45-50 | ????＜0.5 | ????＜40 | ????＜2° |
| ????B | ????60 | ??0.5-3.5 | ??46-51 | ????＜0.5 | ????＜40 | ????＜2° |
Adopt technology welding gained weld seam of the present invention to carry out the ultrasonic examination of U.S. AWSDI1-1 standard implementation to above-mentioned A, B weldment, result of determination reaches first water grade D grade standard.
Adopt technology welding gained weld seam of the present invention to carry out mechanical property test through mechanical means intercepting sample to above-mentioned A, B weldment, the result all satisfies the raw material mechanical performance index.Embodiment two
Present embodiment ties up to the vertical position welding weld job that adopts the inventive method to implement down with the foregoing description one the same terms.The purpose that provides present embodiment mainly is, with CO of the present invention
2Semi-automatic vertical position welding of gas shield and/or oblique vertical position welding solder technology are done manual work with the manual arc welding technology under identical weldment, the similar welding condition and are imitated contrast.
Joint title: B
2, B
3,
Weldment and weld seam example:
Weldment and annex (liner plate and introducing, end tab) material: A572-50
Weldment material thickness: δ=85mm
Position while welding: vertical vertical position welding
Fusion length: 2450mm (containing introducing, end tab)
Joint form: the two-way butt joint of two plates
Groove type: the single face mo(u)ld top half adds backing
Bevel angle: α=30 °
Gap, the end: e=10mm
Face gap: b=54mm
Welding length overall: 766 linear meters
With B
2The two two-way butt joint vertical position welding of the plate joints of group are contrast one side, adopt CO of the present invention on their weld seam
2The semi-automatic vertical position welding technical operation of gas shielded arc welding.
With B
3The two two-way butt joint vertical position welding of the plate joints of group adopt manual electric arc welding vertical position welding technical operation for the opposing party of contrast on their weld seam.
After fulfiling assignment separately, be compared as follows for the unit effect with the joint:
(1) CO
2The semi-automatic vertical position welding operation of gas shield group:
Put into 29KW/n rectifier arc welder 5 machine-teams;
Put into 0.6m
3 Air compressor 1 machine-team;
Consume φ 1.2 welding wire 104.5kg;
Consume 3 bottles of oxygen, 2 bottles of acetylene gas;
Consume CO
28 bottles of (every bottle of 4.4m of gas
3);
Real consumption is artificial: 5 work days;
The on-the-spot welding rubbish 1kg that removes of postwelding.
(2) manual electric arc welding vertical position welding operation group;
Drop into 26KW/n DC arc welder 16 machine-teams;
Drop into 0.6m
3 Air compressor 1 machine-team;
Consume high-quality electric arc bar 172kg;
Consume 3 bottles of oxygen, 2 bottles of acetylene gas;
Real consumption is artificial: 16 work days;
The postwelding scene 70kg that removes rubbish.
Above-mentioned work efficiency comparing result confirms that this contrast groups is under same working condition, to the joint employing CO of same specification
2The semi-automatic vertical position welding technical operation of gas shielded arc welding, directly knot is paid 1850 yuan (RMB) approximately.Embodiment three (one) weldment inspections
Weldment code name: amount to two groups of 22B, 23B weldment
Joint categories: the oblique vertical position welding joint of the two-way butt joint of two plates
Weldment and annex (liner plate and introducing, end tab) material is A572-42W
Weldment thickness: δ=85mm
Fusion length: 1600mm adds that leading in/out plate welding seams closes 50mm, adds up to 1700mm
The weld seam gradient: 42 ° 30 '
Groove type: single face V-type; The root backing
Bevel angle: α=30 °
Root spacing: 26mm-30mm
Seam interplanar distance: 70mm-74mm
Welding length overall: 880 linear meters
This docks oblique vertical position welding joint at the steel construction complex structure, the welding capacity high concentration, and structure installation blockiness is handled the position of alignment error; Most nodes fit-up gap overgauge spare assemblage gap, the joint group is to existing the misalignment phenomenon, and this type of joint welding constraint stress is bigger, easily produces cold and hot crackle.
To this type of joint, if adopt the manual electric arc welding operation of common double to symmetrical welding, then easily too slow because of welding speed, heat scatters and disappears fast, and interlayer temperature is low excessively, and root run is bigger with the nearly surface layer weld seam temperature difference, easily forms crackle.Adopting even if improve one's methods that 4 people are bi-directional segmented on the same group to be symmetrically welded, also only be the generation rate that has reduced the above-mentioned type quality accident to a certain extent for similar weld seam, and production efficiency is also lower.
Empirical evidence: adopt weldering speed soon, easily to keep higher interlayer temperature, welding method that welding deformation is little to handle the weld seam that this type of has big constraint stress, can reduce and avoid similar quality accident.Adopt CO of the present invention
2The semi-automatic oblique vertical position welding technical operation of gas shield promptly has this effect.(2) welding step is as follows:
1. improve the windproof and rain proof measure;
2. the inside and outside corrosion dirt of cleaning groove;
3. installation liner plate;
This routine extra wide gap weld seam adopts identical with the weldment material, and thickness is 25mm, long 1700mm, the special liner plate of wide 100mm.The installation special requirement are as follows:
(1) removes liner plate, oxide, corrosion, dirt;
(2) remove weld seam back oxide, corrosion, dirt;
(3) along the heating of weld seam straight flange back, it is identical with formal welding to add heat request;
(4) the manual electric arc welding operation is adopted in the location, and welding rod is selected the E5015 alkaline low-hydrogen electrode for use, conscientiously cures by operation instructions before the welding rod weldering;
(5) tack weld K=8mm, L 〉=50mm, every spacer segment 150mm; What should illustrate is that the tack welding weld seam only allows to carry out at the straight flange dorsal part.
4. implement welding:
(1) vertically heats heating-up temperature＞150 ℃ along straight flange outside 150mm scope;
(2) pursue road built-up welding from root to the face seam in weld seam straight flange side with reference to table 1 first floor welding parameter of the present invention; (3) the built-up welding operation does not relate to the groove place; (4) first road weld seam: bed thickness≤10mm, welding bead wide cut≤15mm; (5) method of operating: press, choose, be with, change, drag; (6) technological requirement: 1. will stitch entirely be divided into I=400mm (containing end tab), II=400mm, III=500mm, IV=400mm (
Contain lead-in plate) totally 4 sections by backstep sequence welding.Every section beginning toe L=50, welding wire are thick little
In 7mm, welding bead wide cut≤10mm.2. the segmentation joint adopts the carbon arc air gouging method to be processed into the gentle slope shape.3. each road bead-on-plate weld is all taked the backstep sequence welding after; Carbon arc gas is all adopted in each joint, road
Dig and handle.Each road joint should interlaced 50mm.Adopt carbon arc air gouging method refine weld seam when 4. all the built-up welding operation is apart from straight flange edge 5mm, remove the slope
Oral-lateral does not weld liner plate and domatic splashing, vaporific attachment, carbon dust.(7) back welding (be the first floor welding): 1. will clear up weld seam straight flange side, sloping avris after rebuilding and be heated to simultaneously and be not less than 150 ℃.2. welding parameter is selected: see Table 3. method of operating of each parameter of 1 first floor: press, choose, be with, change, drag.4. operation main points:
1) this layered suture is divided into I=300mm (containing end tab), II=500mm, III=900mm, (contain and draw
Entering plate) totally three sections backstep weldings gradually, every section beginning weldering place bed thickness are not more than 5mm, length is not less than 50mm,
The weldering place 50mm melting welding again of will beginning the last period when engaging with leading portion of one section of back, rewelding, it is not little to locate bed thickness
In 7mm.
2) this layer weld seam should be brought into play CO
2That gas shield semiautomatic welding, electric current change is small, wire feed is supplied gas
Process all can be by the advantage that is assemblied in any control of finger pressure switch on the welding gun, and continued operation is protected
Hold minimum joint.
Use CO of the present invention
2The semi-automatic oblique vertical position welding technology gained first floor weld seam of gas shield, the edge
Fusion is good, and the middle part is protruding slightly, and weld ripples is even, and wave space is from thick (being about 5mm) slightly.(8) second layer welding:
Second layer weld seam is fit to the calm utilization of five word skill and technique, and the operator does not have urgent sensation.
Welding parameter: see Table each parameter of 1 second layer
The operation main points: backstep, joint and anterior layer about 50mm that interlocks, other parts are continuous
Do not stop and finish every section welding.
After full seam is finished, scarfing cinder fast.
This level adopts the weld seam of five word skill and technique operation, and joint is two places only, with
Manual electric arc welding is compared, and the ratio of piece-ups is 1/15, and the edge is full, in
Between recessed slightly, weld ripples is even, the about 4mm of wave space.(9) the 3rd layers of welding:
Welding parameter sees Table 1 the 3rd layer.
CO of the present invention
2Semi-automatic vertical position welding of gas shield and/or oblique vertical position welding technology; the main equipment that uses has the manual function of long distance work; the adjusting of electric current and voltage causes operator's body side by special-purpose control line; the process that changes electric current and voltage only needed to finish for 1 second, but but for length greater than 5 meters straight bead, bending weld seam, revolution weld seam rightward welding leftward winding, can weld repeatedly.
This level seam is wide fully can be with above-mentioned semiautomatic welding technical advantage performance.
Five word skill and technique of the present invention are able to more accurate use because welding gun can freely operate, and bed thickness is also easy to control at about 7mm, and wide cut is 18-20mm.The full nothing depression of weld edge, the centre is recessed slightly, a word shape in the weld ripples, wave space is from being about 3.5mm.Full seam is two place's joints only, with the ratio of manual electric arc welding piece-ups be 40: 2.(10) each layer after:
Each layer parameter value after welding parameter is selected to see Table 1.
The 3rd layer of each later layer, weld seam is gradually wide, when wide cut during greater than 25mm, still adopts single layer welding, and the weld seam local temperature is raise, and bed thickness is difficult to be controlled at and is not more than 7mm.Use the multi-pass welding method instead, welding parameter is selected table 1 first floor and second layer arc voltage value, welding current value for use.Electrode extension is selected 25-30mm for use, CO
2Gas flow is selected 45-50L/min for use, and the operation skill and technique as described above.(11) surface layer welding:
1) welding parameter is selected: the little value of each parameter of the first floor, electrode extension is selected 20-25mm for use, CO
2
Gas flow is selected 50-55L/min for use.
2) the operation skill and technique as described above.3) layer road arranged: the surface layer welding is done the welding of first road from straight flange, and the extreme trace weld seam is arranged in sloping avris.4) technology main points: first road weld seam will stitch length entirely and be divided into 400mm, 500mm, 400mm, 400mm totally four sections backsteps.Less than 15mm, back segment and leading portion joint are dark fast molten less than 5mm, L≤30mm, wide cut for beginning weldering place bed thickness, and bed thickness is not less than 7mm, wide cut is about 20mm.The second road weld seam stitches length entirely and is divided into 450mm, 450mm, 450mm, 350mm totally 4 sections backsteps.Beginning weldering place requires identical with preceding road, this road weld seam and superimposed 1/3 wide cut of the first road fusion, the 3rd road requires identical with second road, the staggered 50mm in sectionalizing joint place only, extreme trace weld seam, the total length weld seam is divided into 400mm, 300mm, 300mm, 300mm, five sections backsteps of 400mm, and the welding requirements of sectionalizing joint joint is identical in preceding road, fusion is identical with the requirement of preceding road between the road, and extreme trace weld seam bed thickness is not more than 7mm, wide cut 20mm.Full set of joints postwelding after heat, back heat rating; Vertically heat along each 100mm along joint edge.200 ℃ of postheat temperatures.The asbestos cloth insulation.
Two groups of oblique vertical position welding joints of 22B, 23B, self check after 24 hours:
Face seam reinforcement: 0.5-4mm
The face seam is wide: 71-76mm
Carry out U.S. AWSD1-1 standard, weld seam all reaches the D grade standard through two groups of oblique vertical position welding joints of ultrasonic inspection: 22B, 23B.Superior in quality.
Ultrasonic wave is rechecked after 72 hours: two groups of oblique vertical position welding joints of 22B, 23B still reach the D grade standard, and are superior in quality.
Claims (11)
1. CO
2Semi-automatic vertical position welding of gas shield and/or oblique vertical position welding welding procedure, it may further comprise the steps:
Weldment (mother metal) is carried out checking before the routine weldering, and carry out environment maintenance and equipment debugging;
Carry out the weldment group to and weldment slagging-off, and the solid liner plate of point and introducing, end tab;
Simulate test weld, check, check and adjust vertical position welding/oblique vertical position welding welding welding parameter;
Weldment is carried out the preceding heating schedule of weldering;
Vertical position welding/oblique vertical position welding welding parameter and operation skill and technique by this law are welded, and wherein adopt Korea Spro's silk wire feed and CO
2The automatic feed of protective gas;
Welding point is carried out the postwelding after-baking by rules;
Slab and ultra-thick plate are carried out weld seam and weldment insulation; It is characterized in that:
Institute's welding parameter is as follows: use the trade mark to be YM-26, the diameter welding wire as 1.2mm, first floor welding arc voltage is not more than 23V, and welding current must be not more than 200A, electrode extension between 30-35mm, used CO
2Gas flow is not less than 55L/min; The welding arc voltage of second layer is 23-25V, and welding current adopts 200-220A, and electrode extension is controlled at 25-30mm, CO
2Gas flow is controlled between 45-55L/min; Corresponding each parameter of the 3rd layer is respectively: arc voltage is 25-27V, welding current 220～250A, electrode extension 25～30mm, CO
2Gas flow 45～55L/min; Each layer is answered the shunting welding later on, and relevant parameter is respectively: arc voltage is 25-27V, welding current 220～250A, electrode extension 20～25mm, CO
2Gas flow 35～45/min;
Described welding skill and technique comprises in regular turn:
(1) pressure welding: press down electric arc in the groove side by edge, make welding wire become the downward inclination angle in high about 5-10 ° of the low and welding wire exit of electric arc, and do 0.5 second short stay;
(2) choose weldering: be right after pressure welding action, in the end of described pressure welding action electric arc be partial to the straight flange of weld groove, make welding wire and straight flange keep being about 15 ° of angles, rapid electric arc is done amplitude upward is that the oblique fast of 3.5-4mm provoked;
(3) tape welding: rising to thereupon of the molten bath of continuing is not more than 6mm with maintenance weld seam bed thickness, and the high about 3.5mm of weld ripples at the uniform velocity transports weldering fast to the straight flange side;
(4) change weldering: along with the action of described tape welding, in case electric arc arrives near the straight flange side of weld groove, the operator rotates electric arc, is no more than " drawing circle " action of 5mm as diameter; (5) drag weldering: finish change the weldering action after, still the form that becomes 15 ° of angles with the straight flange side with welding wire is dragged sloping avris backstep welding to weld groove with electric arc from weld groove straight flange side, gets back to aforementioned pressure welding place.
2. welding procedure as claimed in claim 1, it is characterized in that: described welded piece material thickness is δ=25-90mm.
3. welding procedure as claimed in claim 1 is characterized in that: described welded piece bevel angle is α=30 °.
4. welding procedure as claimed in claim 3, it is characterized in that: the gap, the end of described weld seam is C 〉=10mm.
5. welding procedure as claimed in claim 1, it is characterized in that: described welded piece fusion length is L=300-2500mm.
6. welding procedure as claimed in claim 1 is characterized in that: described welded piece and annex are a kind of in 15MnV, 16Nn, 15MnNR, A36, A572～42W or A572～50.
7. welding procedure as claimed in claim 6, it is characterized in that: described annex comprises liner plate, lead-in plate and end tab.
8. one kind as each described welding procedure of claim 1 to 7, it is characterized in that: the required welding surroundings of this technology is that gentle breeze is prohibited rain.
9. one kind as each described welding procedure of claim 1 to 7, and it is characterized in that: the required welding surroundings of this technology is that relative humidity is less than 70%.
10. one kind as each described welding procedure of claim 1 to 7, and it is characterized in that: described welded part is slab or ultra-thick plate.
11. a welding procedure as claimed in claim 10 is characterized in that: described ultra-thick plate is the steel plate of thickness 130mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96107082A CN1064290C (en) | 1996-07-18 | 1996-07-18 | CO2 gas protected semi-automatic vertical and\or vertical scarf welding technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96107082A CN1064290C (en) | 1996-07-18 | 1996-07-18 | CO2 gas protected semi-automatic vertical and\or vertical scarf welding technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1171316A true CN1171316A (en) | 1998-01-28 |
| CN1064290C CN1064290C (en) | 2001-04-11 |
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ID=5119521
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96107082A Expired - Lifetime CN1064290C (en) | 1996-07-18 | 1996-07-18 | CO2 gas protected semi-automatic vertical and\or vertical scarf welding technology |
Country Status (1)
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|---|---|
| CN (1) | CN1064290C (en) |
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| CN101913017A (en) * | 2010-08-09 | 2010-12-15 | 河北省电力公司职业技术培训中心 | Method for welding Q420 steel for power grid iron tower |
| CN103192166A (en) * | 2013-04-03 | 2013-07-10 | 齐齐哈尔鑫拓金属铆焊有限责任公司 | Method for welding middle web plate and impact base for axle load ore car |
| CN103692054A (en) * | 2013-12-17 | 2014-04-02 | 鞍钢重型机械有限责任公司 | CO2 gas shielded welding operation method for vertical weld joint |
| CN103949756A (en) * | 2014-03-31 | 2014-07-30 | 长治清华机械厂 | Method for vertical welding of HG785D steel plate robot |
| CN105189011A (en) * | 2013-02-06 | 2015-12-23 | 新日铁住金株式会社 | Multi-electrode electrogas arc welding method for thick steel plates and multi-electrode electrogas arc circumferential welding method for steel pipes |
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| CN112719517A (en) * | 2020-12-16 | 2021-04-30 | 中车眉山车辆有限公司 | Fusion welding connection process for special-shaped welding seams of steel structure car body |
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| CN100445011C (en) * | 2006-08-07 | 2008-12-24 | 新疆石油工程建设有限责任公司 | Electrogas arc welding method for vertical line of large-scale floating roof tank reverse construction |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3732393A (en) * | 1970-09-03 | 1973-05-08 | Messer Griesheim Gmbh | Electric arc welding process |
| JPH03110070A (en) * | 1989-09-21 | 1991-05-10 | Matsumoto Kikai Kk | Method and equipment for consumable electrode automatic arc welding |
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1996
- 1996-07-18 CN CN96107082A patent/CN1064290C/en not_active Expired - Lifetime
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| CN105189011A (en) * | 2013-02-06 | 2015-12-23 | 新日铁住金株式会社 | Multi-electrode electrogas arc welding method for thick steel plates and multi-electrode electrogas arc circumferential welding method for steel pipes |
| CN103192166A (en) * | 2013-04-03 | 2013-07-10 | 齐齐哈尔鑫拓金属铆焊有限责任公司 | Method for welding middle web plate and impact base for axle load ore car |
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| CN103692054B (en) * | 2013-12-17 | 2016-06-01 | 鞍钢重型机械有限责任公司 | The CO of a kind of vertical position welding seam2The working method of shielded welding |
| CN103692054A (en) * | 2013-12-17 | 2014-04-02 | 鞍钢重型机械有限责任公司 | CO2 gas shielded welding operation method for vertical weld joint |
| CN103949756A (en) * | 2014-03-31 | 2014-07-30 | 长治清华机械厂 | Method for vertical welding of HG785D steel plate robot |
| CN103949756B (en) * | 2014-03-31 | 2016-05-04 | 长治清华机械厂 | One HG785D steel plate robot vertical position welding method |
| WO2017045477A1 (en) * | 2015-09-17 | 2017-03-23 | 中建钢构有限公司 | Nightside inclined-vertical-butting welding method |
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Owner name: CHINA CONSTRUCTION THIRD ENGINEERING BUREAU CONST Free format text: FORMER OWNER: STEEL STRUCTURE BUILDING INSTALLATION ENGINEERING COMPANY OF CHINA CONSTRUCTION THIRDENGINEERING BUREAU Effective date: 20080425 |
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Application publication date: 19980128 Assignee: China Construction Steel Structure Corp., Ltd. Assignor: China Construction Third Engineering Bureau Co., Ltd. Contract record no.: 2010990000138 Denomination of invention: CO2 gas shielded semi-automatic vertical welding and / or oblique welding plate welding process Granted publication date: 20010411 License type: Exclusive License Record date: 20100324 |
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