CN104096954A - Double two-sided synchronous tungsten electrode high-frequency pulse argon arc welding butt welding method - Google Patents
Double two-sided synchronous tungsten electrode high-frequency pulse argon arc welding butt welding method Download PDFInfo
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- CN104096954A CN104096954A CN201410290150.0A CN201410290150A CN104096954A CN 104096954 A CN104096954 A CN 104096954A CN 201410290150 A CN201410290150 A CN 201410290150A CN 104096954 A CN104096954 A CN 104096954A
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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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
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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
- B23K9/025—Seam welding; Backing means; Inserts for rectilinear seams
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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
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
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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
- B23K9/235—Preliminary treatment
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
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Abstract
A double two-sided synchronous tungsten electrode high-frequency pulse argon arc welding butt welding method is implemented by the following steps: cleaning up sundry, carrying out groove processing on the welding position of a wall plate of a stainless steel storage tank, welding position welding, choosing welding torch equipment, aligning a same weld pool by a main welding torch and an auxiliary welding torch from the inside and outside of a weld joint respectively synchronously, arcing synchronously by the main welding torch and the auxiliary welding torch, enabling the auxiliary welding torch to be moved synchronous to the main welding torch, welding along the same direction at the same speed, and stopping arcing by the main welding torch and the auxiliary welding torch synchronously. By adopting the double two-sided synchronous tungsten electrode high-frequency pulse argon arc welding butt welding method, the inner side forming of the weld joint is protected and penetrated, the defects of oxidation, overlap, lack of penetration and the like of the weld joint are avoided, the processes of root clearing, grinding and re-welding on the inner side are omitted, compared with the prior art, the method has the advantages of simple method and easy implementation, the production efficiency is greatly improved, and the labor intensity of workers is lowered.
Description
Technical field
The present invention relates to a kind of welding method of steel storage tank tank skin, particularly the construction method of the simultaneously inside and outside two-sided welding of a kind of vertical seam of stainless steel stave sheets and circular seam argon welding rush-harvesting and rush-planting.
Background technology
The thickness that steel storage tank belongs to wallboard is the welded vessel of increment type successively from top to bottom, and its weld seam is many, and thickness of slab kind is many, in construction, often can produce larger wave transformation.Stainless steel storage tank is a kind of as steel storage tank container; its stainless steel is main (as SUS304, SUS315L, 307 etc.) mainly with austenitic stainless steel greatly; austenitic stainless steel thermal conductivity factor is little and the coefficient of expansion is large; during welding, be easier to produce moderate finite deformation and welding stress; and at present in rustless steel container equipment Manufacture Process; often can run into vertical, circumferential weld main on some rustless steel container equipment all requires complete penetraction and fusion in welding, and will carry out X ray detection.
For the storage tank of stainless steel, traditional manufacture craft is finished edge on wallboard, is then grouping welding.Conventional welding method has direct-current tungsten electrode argon-arc, argon tungsten arc welding and the single two-sided manual electric arc welding the most close with the present invention.
Direct-current tungsten electrode argon-arc welds in relative manual electric arc welding argon arc welding welding process and does not splash, there is no slag, outside welding bead moulding is attractive in appearance, but due to stainless oxyphie characteristic, the black stream of its oxidizable generation in inner side, carbonization, must carry out back chipping operation welding again, and welding times is still a lot, increased operating personnel's labour intensity, production efficiency is not high simultaneously.While welding for stainless steel, avoid weld joint on inner side oxidation, often when outside argon arc welding bottoming is welded, take now a series of anti-oxidation measure: as the anti-oxidation method of Ar is filled in weld seam inner side, the anti-oxidation method of N2, the anti-oxidation method of inner side self-shield argon arc welding bottoming etc. are filled in weld seam inner side.Shaping and the quality of weld seam inner side when the application of these anti-oxidation measures has guaranteed to weld between corrosion resistant plate, but also greatly increased welding cost simultaneously.
The process stabilization of argon tungsten arc welding own, use cost is low, but weld penetration is more shallow, penetration rate is lower, be only suitable for welding 3mm thickness with interior steel plate, be not suitable for welding slab, it is high that conventional direct current argon tungsten arc welding is also prone to stomata sensitivity, joint plasticity is poor, affects the technical problem of welded seam shaping and quality.
Single two-sided manual electric arc welding is first in the bottoming welding of the outside of tank skin commissure, and capping after the back chipping of inner side, finally arrives outside by original bottoming place capping.Manual electric arc welding itself is splashed larger, and weld seam internal stress is large, during welding, due to the effect of one side stress, easily produces welding deformation, need to after the back chipping of inner side, heat welding again.The number of times that is heated that the form of construction work of this single two-sided priority welding has increased weld seam both sides has strengthened the probability of seam deformation simultaneously; Conventional back chipping (removing the skull of the root of weld) method comprises carbon arc air gouging and manually polishes two kinds simultaneously, the former requires high to workman's technical merit, misoperation, the defect such as easily produce carburizing, slag inclusion, burn, thereby affect the welding procedure of later process, latter can make the moulding that weld seam width is uneven, the very large probability of the inefficiency that is uneven affects follow-up cosmetic welding.
Summary of the invention
The object of this invention is to provide a kind of double Double-side Synchronous tungsten electrode high-frequency impulse argon arc welding butt welding engineering method, solving in the stave sheets welding of stainless steel uses single two-sided manual electric arc welding itself to splash larger, weld seam internal stress is large, effect due to one side stress, easily produce welding deformation, the number of times that is heated that has increased weld seam has strengthened the technical problem of the probability of seam deformation simultaneously; Also to solve while using argon arc welding, the black stream of the oxidizable generation in inner side, carbonization, need carry out back chipping operation, welding times is many, labor strength is large, the technical problem that production efficiency is not high, when anti-oxidation measure also cannot guarantee to weld between corrosion resistant plate, shaping and the quality of weld seam inner side have also increased welding cost simultaneously greatly; And weld penetration is more shallow while solve using argon tungsten arc welding, penetration rate is lower, and thickness of slab accommodation is narrow, is prone to stomata sensitivity high, and joint plasticity is poor, affects the technical problem of welded seam shaping and quality.
For achieving the above object, the present invention adopts following technical scheme:
A double Double-side Synchronous tungsten electrode high-frequency impulse argon arc welding butt welding engineering method, construction procedure is as follows:
Step 1, cleaning foreign material: stainless steel stave sheets group, to front, is first cleaned out the impurity such as the iron rust of weld seam both sides, greasy dirt, oxide;
Step 2, carries out groove processing to the welding position of stainless steel stave sheets;
Step 3, welding tack welding: two stainless steel stave sheets groups to time according to the thickness preset clearance of sheet material, reserved gap is 1.5～2.5mm, and use manual argon arc welding welding to locate, the length of every section of tack welding is 10mm, adjacent two sections of tack weldings be spaced apart 150～200mm, and group to time guarantee the margin of tolerance that counterpart unfitness of butt joint allowing within;
Step 4, selects welding gun equipment: the outside of weld seam is main welding torch, and welding gun equipment is MSM-400 inversion direct current HF pulse argon-arc welder, and the inner side of weld seam is auxiliary welding torch, and welding gun equipment is ZXT-400STG DC argon arc welding welding machine;
Step 5, play weldering: in the weld seam both sides of wallboard, be respectively provided with a welder, the welding wire matching with wallboard is selected in outside, inner side is according to the thickness of slab Selective filling welding wire of wallboard or filler wire not, main welding torch and auxiliary welding torch are respectively in weld seam, same molten bath is aimed in outer both sides simultaneously, main welding torch is front, auxiliary welding torch lags behind main welding torch, both spacing remain a molten bath length to play a protective role, keep main welding torch, angle between auxiliary welding torch and welding wire and wallboard is fixed, both synchronous starting the arc, auxiliary welding torch is followed main welding gun synchronizing moving, with same speed, along same direction, weld,
Step 6, receives weldering: main welding torch and auxiliary welding torch are received arc simultaneously, and latter two welding torch of receipts arc all continues applying argon gas 3s～5s.
In described step 2, the groove processing requirements of stainless steel stave sheets is as follows:
When wallboard thickness≤10mm, do not beat groove,
When 10mm < wallboard thickness≤16mm, beat band root face one side double V-groove, unfitness of butt joint must not be greater than 1mm,
When wallboard thickness G reatT.GreaT.GT 16mm, the inside and outside two V grooves of polishing are X-type groove.
In described step 4, main welding torch and secondary welding torch are contravariant straight polarity direct current method, and the electric current that keeps main welding torch during use is 132～143A, and voltage is 14～16V, and the flow of argon gas is 8～12L/min; The electric current that keeps secondary welding torch is 41～62A, and voltage is 8～10V, and the flow of argon gas is 8～12L/min.
In described step 5, the requirement of filler wire is as follows:
When wallboard thickness≤10mm, the outside filler wire of weld seam, inner side is filler wire not,
When 10mm < wallboard thickness≤16mm, the inner side of weld seam and outside be filler wire bottoming simultaneously, after bottoming, due to what polish, is one side double V-groove, and therefore outside needs coating Manual electric welding capping with reinforcement of weld intensity,
When wallboard thickness G reatT.GreaT.GT 16mm, the inner side of weld seam and outside be filler wire bottoming simultaneously, due to polishing after bottoming is the double V-shaped skin mouth of X-type, therefore inner side and outside all need coating Manual electric welding capping with reinforcement of weld intensity, capping is sequentially the first capping in inner side, outside is capping again, prevents contraction distortion.
In described step 5, main welding torch and panel surfaces are 75 °～85 ° angles, and the welding wire that fill in outside is horizontal by 15 °～20 ° angles, and auxiliary welding torch and panel surfaces are 80 °～90 ° angles, and the welding wire that fill inner side is horizontal by 15 °～20 ° angles.
In described step 5, a molten bath length is for being not more than 3mm.
In described step 5, outside welder at the uniform velocity weld, too high if weld seam occurs, inner side welder accelerates weldering speed, and inside allowing, molten bath, the suitable leading outside of electric arc, impels outside welder to accelerate in time speed of welding; If indent appears in weld seam, inner side welder adds the speed of welding wire outside express delivery according to the predetermined way notice outside welder who knocks stave sheets and send the sound speed of welding that slows down simultaneously, to reach the inside and outside good cooperation in both sides.
Compared with prior art the present invention has following characteristics and beneficial effect:
The invention provides a kind of double Double-side Synchronous tungsten electrode high-frequency impulse argon arc welding butt welding engineering method, be to adopt two welding guns to aim at the welding of same molten bath from both sides inside and outside weld seam simultaneously, with same speed, along same direction, welds.Being actually outside welding gun in utilizing makes two electric arcs of inside and outside both sides simultaneously to the heating of same molten bath as thermal source welding torch; to obtain needed fusion penetration, make welding pool and around positive anti position can argon gas adequately protect and the concentrated high heat energy effect of double-torch under weld.And due to the open arc feature of argon arc welding, inner side welder can see the position, molten bath of outside welder's welding completely clearly, and aims at positive molten bath and protect, and plays the effect of combined heat fusing simultaneously, makes fully penetration of welding base metal.
The present invention utilize the arcing of two-sided welding gun form one upwards, to middle holder power, and jointly molten bath is played to supporting role with the surface tension in molten bath, thereby prevent lower of molten pool metal and obtain perfect weld seam, face of weld is silvery white in color or golden colour lustre substantially.And under the power of the blowing effect of the two arcs of two argon arc weldings, improve the mobility of molten pool metal, the heat energy of two arcs is not fully exerted, and the superior ability that outside is used its flashing of HF pulse argon-arc welder to penetrate, has improved penetration thickness.Two-sided argon arc welding technique can be applied in the middle of thicker Plate Welding construction.
The present invention has overcome the more shallow defect of argon tungsten arc welding fusion penetration weld penetration, utilize butt welding principle to strengthen depth of penetration, adopt high-frequency impulse argon arc welding effectively to reduce the stomata sensitivity of weld seam, improve joint performance, improve welding quality, and again strengthened can welding steel thickness scope.
The present invention welds outside in weld seam simultaneously, arc energy increase in density, and energy is more concentrated, make heating surface area and heat-affected zone little, the corresponding welding stress that reduced, has reduced fire check and at hot cracking tendency, postwelding discovery welding deformation and crackle probability are very little.The two electric arc heated fusings in interior outside make 10mm not need with lower contact on the member welding joints of interior thickness the groove of polishing, and get final product a through welding shaping and remove inner side back chipping from.
The present invention makes the weld seam number of times that is heated reduce and to have controlled welding deformation, has improved speed of welding, has reduced weld metal loading, has prevented the generation of hydrogen embrittlement and oxidation.The present invention saves 2/3 of the manual electric arc welding time used, and welding is quick, and has also saved the time of groove processing simultaneously.
Double Double-side Synchronous tungsten electrode pulse argon arc duct butt-welding method of the present invention; the inner side of butt welded seam is shaped and has played protection and penetration effect; prevent that oxidation, overlap, the defect such as lack of penetration from appearring in weld seam; inner side back chipping, polishing, the operation such as welding have again been removed from; contrast prior art; the method has advantages of that method is simple and is easy to realize, greatly improved production efficiency, and reduced workman's labour intensity.
The present invention can be widely used in carbon steel storage tank equipment and magnadure container.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is the schematic side view of construction of the present invention.
Fig. 2 is the schematic perspective view of construction of the present invention.
The main welding torch of Reference numeral: 1-, the auxiliary welding torch of 2-, the stainless steel stave sheets of 3-, 4-welding wire, 5-argon gas, 6-groove.
The specific embodiment
The present embodiment is with the stainless steel stave sheets soldering stainless steel storage tank processed of welding SUS304 material as explanation, and stainless steel tank diameter to be made is 12m, is highly 21m, amounts to 14 circle wallboards, every circle wallboard plate hight 1.5m, thickness is followed successively by 16mm, 14mm from bottom to top, 12mm, 12mm, 10mm, 10mm, 8mm, 8mm, 8mm, 6mm, 6mm, 6mm, 6mm, 6mm.
Embodiment adopts double Double-side Synchronous tungsten electrode pulse argon arc duct butt-welding method, and the outside of weld seam is main welding torch, and welding gun equipment is MSM-400 inversion direct current HF pulse argon-arc welder, and the inner side of weld seam is auxiliary welding torch, and welding gun equipment is ZXT-400STG DC argon arc welding welding machine.
MSM-400 inversion direct current HF pulse argon-arc welder: welding current with per second several thousand times even the high frequency change of several ten thousand times, such high-frequency pulse electric current makes the magnetic pinch of electric arc stronger, the compression that arc diameter is subject to is more fierce, deflection, dynamics and the depth of fusion of electric arc have been strengthened, make molten bath well stir simultaneously, change the metallurgical performance of weld seam, be particularly suitable for aluminium and aluminium alloy and stainless welding.The pressure that high-frequency impulse electric arc produces also causes ultrasonic vibration, and it can strengthen the mobility of deposite metal, and these are all conducive to crystal grain thinning, reduces weld porosity, makes appearance of weld attractive in appearance.In the situation that welding current mean value is equal, the comparable common argon tungsten-arc welding of high-frequency impulse argon tungsten-arc welding speed doubles, this just must shorten weld metal in the time of staying of high temperature, strengthens the penetration thickness of steel plate, to improving corrosion resistance of austenitic stainless steels, is useful.
ZXT-400STG DC argon arc welding welding machine: be the common TIG welding abbreviation in argon arc welding machine; most widely used a kind of; belong to non-melt pole inert gas-shielded arc welding; during welding, tungsten electrode only plays electric action; do not do and fill metal (not melting), as needs, fill and separately add welding wire, argon gas enters weld zone by welding gun; between tungsten electrode and welded piece, energising produces electric arc, and electric arc burns in the atmosphere of inert gas.There is not any chemistry, metallurgy action in argon gas tungsten electrode, workpiece, filler wire in welding process.The outstanding feature of inert gas-shielded arc welding is that arc burning is stable, can effectively completely cut off ambient air, makes molten bath, filler wire is not oxidized and nitrogenize, thereby can obtain high-quality weld seam, and can carry out all-position welding.
This double Double-side Synchronous tungsten electrode high-frequency impulse argon arc welding butt welding engineering method, construction procedure is as follows:
Step 1, cleaning foreign material: 3 groups of stainless steel stave sheets, to front, are first cleaned out the impurity such as the iron rust of weld seam both sides, greasy dirt, oxide.
Step 2, carries out groove 6 to the welding position of stainless steel stave sheets 3 and processes, and requires as follows:
When wallboard thickness≤10mm, do not beat groove,
When 10mm < wallboard thickness≤16mm, beat band root face one side double V-groove, unfitness of butt joint must not be greater than 1mm, participates in shown in Fig. 1,
When wallboard thickness G reatT.GreaT.GT 16mm, the inside and outside two V grooves of polishing are X-type groove, shown in Figure 2,
Step 3, welding tack welding: 3 groups of two stainless steel stave sheets to time according to the thickness preset clearance of sheet material, reserved gap is 1.5～2.5mm, and use manual argon arc welding welding to locate, the length of every section of tack welding is 10mm, adjacent two sections of tack weldings be spaced apart 150～200mm, and group to time guarantee the margin of tolerance that counterpart unfitness of butt joint allowing within;
Main welding torch 1 and secondary welding torch 2 are contravariant straight polarity direct current method, and the electric current of main welding torch is 132～143A, and voltage is 14～16V, and the flow of argon gas is 8～12L/min; The electric current of secondary welding torch is 41～62A, and voltage is 8～10V, and the flow of argon gas is 8～12L/min, is mainly that the inner side of butt welded seam has been shaped and protects and the effect of penetration, with prevent weld seam occur oxidation, overlap, lack of penetration etc. must defect.
Step 4, selects welding gun equipment: shown in Figure 2, the outside of weld seam is main welding torch, and welding gun equipment is that welding gun equipment is MSM-400 inversion direct current HF pulse argon-arc welder, and gage of wire is φ 2.5mm; The inner side of weld seam is auxiliary welding torch, and welding gun equipment is ZXT-400STG DC argon arc welding welding machine.
Step 5, play weldering: shown in Figure 1, vertical girth joint both sides at wallboard are respectively provided with a welder, the welding wire 4 matching with mother metal is filled in outside, inner side is according to wallboard thickness of slab Selective filling welding wire or filler wire not, in welding position, carry out horizontal position welding or vertical position welding, main welding torch and auxiliary welding torch are respectively in weld seam, same molten bath is aimed in outer both sides simultaneously, main welding torch is front, auxiliary welding torch lags behind main welding torch, both spacing remain a molten bath length to play a protective role, the length in a molten bath is for being not more than 3mm, both synchronous starting the arc, auxiliary welding torch is followed main welding gun synchronizing moving, with same speed, along same direction, weld,
Outside welder at the uniform velocity welds, main welding torch and panel surfaces are 75 ° to 85 ° angles, the welding wire that fill in outside is horizontal by 15 ° to 20 ° angles, and auxiliary welding torch and panel surfaces are 80 ° to 90 ° angles, and the welding wire that fill inner side is horizontal by 15 ° to 20 ° angles.
Outside welder, guarantee, under the full condition of weld seam, should to make speed of welding stable as far as possible, creates good conditions for reverse side welder coordinates, and reverse side welder is according to the mobility in molten bath, guaranteeing to be through welding full again in the situation that, regulates electric current.If it is too high that weld seam occurs, inner side welder accelerates weldering speed, and inside allowing, molten bath, the suitable leading outside of electric arc, impels outside welder to accelerate in time speed of welding; If indent appears in weld seam, inner side welder sends the predetermined way such as the sound notice outside welder speed of welding that slows down and adds the speed of welding wire outside express delivery simultaneously according to knocking stave sheets, to reach the inside and outside good cooperation in both sides.
Step 6, receives weldering: main welding torch and auxiliary welding torch are received arc simultaneously, and continues the lasting 3s～5s of applying argon gas 5 after receiving arc.
In described step 5, the requirement of filler wire is as follows:
When wallboard thickness≤10mm, the inner side of weld seam is filler wire not, prevents that reverse side from adding welding wire and covering molten bath mobility status, causes incomplete penetration defect, as long as guarantee through welding and level and smooth negative shape, the DC argon arc welding welding machine selection of small current range of trying one's best is 41～52A.
When 10mm < wallboard thickness≤16mm, during weld seam bottoming, need the welding that simultaneously fills silk of outside, inner side, during welding inside welder to aim at welding pool position, front and fill, hysteresis 0mm, to 3mm, tries not in advance.After bottoming, due to what polish, be one side double V-groove, therefore outside needs coating Manual electric welding capping with reinforcement of weld intensity.
When wallboard thickness G reatT.GreaT.GT 16mm, bottoming filler wire simultaneously outside the inner side of weld seam.After bottoming, due to what polish, be the double V-shaped skin mouth of X-type, therefore outside all needs coating Manual electric welding capping with inner side, and capping is sequentially inner side reverse side elder generation capping, is front, outside capping more afterwards, prevents contraction distortion.
Through test, show, during traditional one-sided use conventional DC argon arc welding machine welding, in the situation that wallboard is not beaten groove, the weld penetration degree of depth is 2mm～3mm; One-sided use welding equipment MSM-400 inversion direct current HF pulse argon-arc welder, it is because of the feature of pulse itself, and in the situation that wallboard is not beaten groove, the weld penetration degree of depth is 10mm; Beating the weld penetration degree of depth in the situation of one side double V-groove is 6mm～8mm; Beating the weld penetration degree of depth in the situation of two-sided double V-groove is 12mm～16mm.
And the double Double-side Synchronous pulsed tungsten argon arc welding of mentioning in the present invention, when 10mm < wallboard thickness≤16mm, it is one side double V-groove, can avoid beating double groove and weld penetration, dose welding wire capping a little, outside is carried out capping and is strengthened intensity, because inner side not be used in other filler wire, so more save artificial and time.
When wallboard thickness G reatT.GreaT.GT 16mm, adopt X-type double groove, the present invention also can apply.Be that butt welding bottoming is used in both sides, inner side is without back chipping, after the capping of the complete rear first inner side of inside and outside bottoming, outside capping is to prevent wallboard distortion, when the thickness of wallboard is thicker, can save the time that back chipping is wasted, this also means while utilizing the present invention to weld the larger wallboard of thickness, still can carry out bottoming welding to embody the moulding advantage of butt welding with pulse butt welding.
Claims (7)
1. a double Double-side Synchronous tungsten electrode high-frequency impulse argon arc welding butt welding engineering method, is characterized in that, construction procedure is as follows:
Step 1, cleaning foreign material: stainless steel stave sheets (3) group, to front, is first cleaned out the impurity such as the iron rust of weld seam both sides, greasy dirt, oxide;
Step 2, carries out groove (6) to the welding position of stainless steel stave sheets (3) and processes;
Step 3, welding tack welding: two stainless steel stave sheets (3) group to time according to the thickness preset clearance of sheet material, reserved gap is 1.5～2.5mm, and use manual argon arc welding welding to locate, the length of every section of tack welding is 10mm, adjacent two sections of tack weldings be spaced apart 150～200mm, and group to time guarantee the margin of tolerance that counterpart unfitness of butt joint allowing within;
Step 4, selects welding gun equipment: the outside of weld seam is main welding torch (1), and welding gun equipment is MSM-400 inversion direct current HF pulse argon-arc welder, and the inner side of weld seam is auxiliary welding torch (2), and welding gun equipment is ZXT-400STG DC argon arc welding welding machine;
Step 5, play weldering: in the weld seam both sides of wallboard, be respectively provided with a welder, the welding wire (4) matching with wallboard is selected in outside, inner side is according to the thickness of slab Selective filling welding wire of wallboard or filler wire not, main welding torch (1) and auxiliary welding torch (2) are respectively in weld seam, same molten bath is aimed in outer both sides simultaneously, main welding torch is front, auxiliary welding torch lags behind main welding torch, both spacing remain a molten bath length to play a protective role, keep main welding torch, angle between auxiliary welding torch and welding wire and wallboard is fixed, both synchronous starting the arc, auxiliary welding torch is followed main welding gun synchronizing moving, with same speed, along same direction, weld,
Step 6, receives weldering: main welding torch and auxiliary welding torch are received arc simultaneously, and latter two welding torch of receipts arc all continues applying argon gas (5) 3s～5s.
2. double Double-side Synchronous tungsten electrode high-frequency impulse argon arc welding butt welding engineering method according to claim 1, is characterized in that: in described step 2, the groove of stainless steel stave sheets (6) processing requirements is as follows:
When wallboard thickness≤10mm, do not beat groove,
When 10mm < wallboard thickness≤16mm, beat band root face one side double V-groove, unfitness of butt joint must not be greater than 1mm,
When wallboard thickness G reatT.GreaT.GT 16mm, the inside and outside two V grooves of polishing are X-type groove.
3. double Double-side Synchronous tungsten electrode high-frequency impulse argon arc welding butt welding engineering method according to claim 1, it is characterized in that: in described step 4, main welding torch and secondary welding torch are contravariant straight polarity direct current method, the electric current that keeps main welding torch during use is 132～143A, voltage is 14～16V, and the flow of argon gas is 8～12L/min; The electric current that keeps secondary welding torch is 41～62A, and voltage is 8～10V, and the flow of argon gas is 8～12L/min.
4. double Double-side Synchronous tungsten electrode high-frequency impulse argon arc welding butt welding engineering method according to claim 1 and 2, is characterized in that: in described step 5, the requirement of filler wire is as follows:
When wallboard thickness≤10mm, the outside filler wire of weld seam, inner side is filler wire not,
When 10mm < wallboard thickness≤16mm, the inner side of weld seam and outside be filler wire bottoming simultaneously, after bottoming, due to what polish, is one side double V-groove, and therefore outside needs coating Manual electric welding capping with reinforcement of weld intensity,
When wallboard thickness G reatT.GreaT.GT 16mm, the inner side of weld seam and outside be filler wire bottoming simultaneously, due to polishing after bottoming is the double V-shaped skin mouth of X-type, therefore inner side and outside all need coating Manual electric welding capping with reinforcement of weld intensity, capping is sequentially the first capping in inner side, outside is capping again, prevents contraction distortion.
5. double Double-side Synchronous tungsten electrode high-frequency impulse argon arc welding butt welding engineering method according to claim 4, it is characterized in that: in described step 5, main welding torch and panel surfaces are 75 °～85 ° angles, the welding wire that fill in outside is horizontal by 15 °～20 ° angles, auxiliary welding torch and panel surfaces are 80 °～90 ° angles, and the welding wire that fill inner side is horizontal by 15 °～20 ° angles.
6. double Double-side Synchronous tungsten electrode high-frequency impulse argon arc welding butt welding engineering method according to claim 1, is characterized in that: in described step 5, a molten bath length is for being not more than 3mm.
7. double Double-side Synchronous tungsten electrode high-frequency impulse argon arc welding butt welding engineering method according to claim 1, it is characterized in that: in described step 5, outside welder at the uniform velocity welds, if it is too high that weld seam occurs, inner side welder accelerates weldering speed, inside allowing, molten bath, the suitable leading outside of electric arc, impels outside welder to accelerate in time speed of welding; If indent appears in weld seam, inner side welder adds the speed of welding wire outside express delivery according to the predetermined way notice outside welder who knocks stave sheets and send the sound speed of welding that slows down simultaneously, to reach the inside and outside good cooperation in both sides.
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