CN104511683A - Upward gas-shielded arc welding method - Google Patents

Upward gas-shielded arc welding method Download PDF

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Publication number
CN104511683A
CN104511683A CN201410489826.9A CN201410489826A CN104511683A CN 104511683 A CN104511683 A CN 104511683A CN 201410489826 A CN201410489826 A CN 201410489826A CN 104511683 A CN104511683 A CN 104511683A
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China
Prior art keywords
welding
shielded arc
wire
quality
gas
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CN201410489826.9A
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CN104511683B (en
Inventor
柿崎智纪
笹仓秀司
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Kobe Steel Ltd
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Kobe Steel Ltd
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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
    • 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
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
    • 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
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • 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
    • B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
    • B23K9/124—Circuits or methods for feeding welding wire

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

An upward gas-shielded arc welding method applied to upward angle welding operation where welding feet are less than 5.0 mm is disclosed. The upward gas-shielded arc welding method is high in arc stability and can obtain a good welding bead shape through a single welding layer. The upward gas-shielded arc welding method employs a gas-shielded arc welding titanium dioxide flux-cored welding wire. The upward gas-shielded arc welding method is characterized in that the gas-shielded arc welding titanium dioxide flux-cored welding wire containing 2:4.5-8.0 mass% of Tio relative to the total mass of the welding wire is adopted under the welding condition that a welding torch inclination angle ranges between 55 degrees to 85 degrees, a welding current ranges between 100 A and 180 A, and welding wire protrusion length ranges between 5 mm to 30 mm.

Description

Vertical upwards gas-shielded arc welding method
Technical field
The present invention relates to the vertical upwards gas-shielded arc welding method of the little leg length employing gas shielded arc welding titanium dioxide flux-cored wire.
Background technology
All the time, in order to carry out weld job expeditiously, the gas shielded arc welding of flux-cored wire is used to carry out in various field.Such as, in patent document 1, disclose a kind of high-speed gas shielded arc welding method using rutile flux cored wire to carry out fillet welding.Welding method described in patent document 1 is in horizontal fillet welding and lap fillet welding, forms the technology considering the high-speed welding method of the little leg length welding bead alleviating welding deformation.
Prior art document
Patent document
Patent document 1: Japanese Unexamined Patent Publication 11-197837 publication
Although the flux-cored wire disclosed in patent document 1 is rutile system, in horizontal fillet welding and lap fillet welding, can obtain with high speed of welding the little leg length welding bead that pit and pore can not occur.But because be horizontal fillet welding use, institute is for when standing to fillet welding, and the kind of slag formation agent and alloy deoxidizer agent and measure incorrect, convex welding bead can occur in upward welding in the vertical position posture and burn such problem.
In addition, in the gas shielded arc welding employing flux-cored wire, when carrying out the standing to fillet welding of the little leg length of requirement, generally constructed by downward welding in the vertical position.In this downward welding in the vertical position, only have single layer to become spill welding bead, the construction of more than two-layer layer therefore will be adopted to weld.Consequently, construction cannot be terminated by single layer, need to remove welding slag before carrying out second layer welding, time be spent.In addition, downward welding in the vertical position is because electric arc is difficult to the angle of encounter root of weld, so the little such problem of the fusion penetration that also can produce root.On the other hand, usually in upward welding in the vertical position, carry out the arc manipulation that forward welding adopts, but the low welding current can reaching little leg length makes arc stability deterioration, welding bead alignment is bad.In addition, if in order to make arc stability carry out welding current increase in upward welding in the vertical position, then there is convex welding bead and the excessive such problem of leg length.
Summary of the invention
The present invention completes in view of such problem points; its problem is; there is provided a kind of leg length be below 5.0mm stand in fillet welding, arc stability is excellent, and can be obtained the vertical upwards gas-shielded arc welding method of good weld bead shape by individual layer layer.
Vertical upwards gas-shielded arc welding method of the present invention is (following; be suitable for being called welding method); be the use of gas shielded arc welding titanium dioxide flux-cored wire (following; be suitable for being called flux-cored wire or being only called welding wire) vertical upwards gas-shielded arc welding method; it is characterized in that; use relative to welding wire gross mass, containing TiO 2: the gas shielded arc welding titanium dioxide flux-cored wire of 4.5 ~ 8.0 quality %, with welding torch angle of inclination: 55 ~ 85 °, welding current: 100 ~ 180A, welding wire gives prominence to length: 5 ~ 30mm is as welding condition.
According to this welding method, flux-cored wire contains TiO with ormal weight 2, the sagging of motlten metal is suppressed, and weld bead shape is good.In addition, by regulation welding torch angle of inclination and welding current, can, under low welding current, weld metal be made to reach little leg length, and weld seam neat and consistent.In addition, give prominence to length by regulation welding wire, welding wire feed amount is adjusted, and the welding little for leg length can reach suitable deposition amount.
In vertical upwards gas-shielded arc welding method of the present invention; preferred described flux-cored wire relative to welding wire gross mass, the total containing C:0.03 ~ 0.10 quality %, Si:0.8 ~ 1.3 quality %, Al:0.10 ~ 0.50 quality %, Na and K: 0.03 ~ 0.15 quality %.
According to such welding method, flux-cored wire contains the total of C, Si, Al, Na and K with ormal weight, and arc stability is better, and the sagging of motlten metal is inhibited further in addition, and weld bead shape is better.
Vertical upwards gas-shielded arc welding method of the present invention, preferably makes the arc manipulation of described flux-cored wire be that straight line arc manipulation welds.
According to such welding method, even straight line arc manipulation, in the welding of the leg length of below 5.0mm, arc stability is also excellent, and can obtain good weld bead shape with single layer.Further, so-called straight line arc manipulation, is exactly do not carry out yaw, and enters the arc manipulation linearly carrying out welding.
In addition, vertical upwards gas-shielded arc welding method of the present invention, can make the leg length of weld metal be below 5.0mm.
Invention effect
According to the present invention, at low currents also can pilot arc stability, level and smooth weld bead shape can be obtained with single layer, can reach and make the distortion of welded structure reach minimal little leg length fillet welding.In addition, can realize good.
Accompanying drawing explanation
Fig. 1 is the ideograph for being described welding torch angle of inclination, and (a) is the figure of the figure based on JIS Z 3001, and (b) is the figure being assumed to be embodiments of the present invention.
Fig. 2 is the ideograph be described for giving prominence to length to welding wire.
Fig. 3 is the ideograph of the leg length representing weld metal.
Detailed description of the invention
Below, embodiments of the present invention are explained.The present invention is the use of the vertical upwards gas-shielded arc welding method of gas shielded arc welding titanium dioxide flux-cored wire.And, about welding method, use and contain TiO relative to welding wire gross mass 2: the flux-cored wire of 4.5 ~ 8.0 quality %, with welding torch angle of inclination: 55 ~ 85 °, welding current: 100 ~ 180A, welding wire gives prominence to length: 5 ~ 30mm is as welding condition.
First, flux-cored wire is described.
" flux-cored wire "
About the flux-cored wire that the present invention is used, contain TiO relative to welding wire gross mass 2be 4.5 ~ 8.0 quality %.The composition of flux-cored wire, if contain TiO by described ormal weight 2, then the composition for other does not have special provision.As other composition, include, for example C, Si, Al, Na, K etc., during containing these compositions, the total of preferred C:0.03 ~ 0.10 quality %, Si:0.8 ~ 1.3 quality %, Al:0.10 ~ 0.50 quality %, Na and K: 0.03 ~ 0.15 quality %.
Below, the composition restriction reason for welding wire is described.
<TiO 2: 4.5 ~ 8.0 quality %>
Suitable TiO 2amount is added, and the effect that the motlten metal that can be inhibited is sagging, can obtain good weld bead shape.TiO in welding wire gross mass 2content lower than 4.5 quality % time, suppress the sagging welding slag component amount of motlten metal not enough, become convex welding bead.On the other hand, if more than 8.0 quality %, then welding slag amount is many, and therefore electric arc encounters welding slag, and electric arc becomes unstable, and welding bead alignment is bad.Therefore, TiO 2content is 4.5 ~ 8.0 quality %.Increase from the view point of the welding slag component amount making suppression motlten metal sagging, TiO 2content is preferably more than 5.0 quality %.In addition, from the view point of making, welding slag amount is more appropriate, is preferably below 7.0 quality %.
<C:0.03 ~ 0.10 quality %>
By the C amount in adjustment welding wire gross mass, more appropriate arc stability can be guaranteed, better weld bead shape can be obtained.If the content of the C in welding wire gross mass is more than 0.03 quality %, then arc stability improves further, and weld bead shape is better.On the other hand, if at below 0.10 quality %, then splashing generating capacity reduces.Therefore, preferred C content is 0.03 ~ 0.10 quality %.From the view point of making arc stability improve further, C content is more preferably more than 0.04 quality %.In addition, from the view point of reducing splashing generating capacity further, below 0.07 quality % is more preferably.
<Si:0.8 ~ 1.3 quality %>
Suitable Si amount is added, and the effect that the motlten metal that can be inhibited is sagging, can obtain better weld bead shape.If the Si content in welding wire gross mass is more than 0.8 quality %, then the effect suppressing motlten metal sagging is large, and weld bead shape is better.On the other hand, if at below 1.3 quality %, then the absorption of the character of machinery can be worth better.Therefore, Si content is preferably 0.8 ~ 1.3 quality %.Larger from the view point of the effect making suppression motlten metal sagging, Si content is preferably more than 0.9 quality %.In addition, from the view point of make the absorption of engineering properties can value better, be more preferably below 1.1 quality %.Further, Si is Si monomer and SiO 2compound in the total amount of Si scaled value.
<Al:0.10 ~ 0.50 quality %>
Suitable Al amount is added, and the effect that the motlten metal that can be inhibited is sagging, can obtain better weld bead shape.If the content of the Al in welding wire gross mass is more than 0.10 quality %, then suppress the sagging welding slag component amount of motlten metal to increase, weld bead shape is better.On the other hand, if 0.50 quality % is following, then splashing generating capacity reduces.Therefore, Al content is preferably 0.10 ~ 0.50 quality %.From the view point of the welding slag component amount more suppressing motlten metal sagging further, more preferably Al content is more than 0.25 quality %.
The total (Na+K) of <Na and K: 0.03 ~ 0.15 quality %>
The interpolation in suitable Na, K source, has the effect that can obtain good arc stability, can obtain better weld bead shape.If the content of the Na+K in welding wire gross mass is more than 0.03 quality %, arc stability is improved further, and weld bead shape is better.On the other hand, if be below 0.15 quality %, then resistance to hygroscopicity improves.Therefore, the content of the total of Na and K is preferably 0.03 ~ 0.15 quality %.From the view point of improving arc stability further, more preferably the content of the total of Na and K is more than 0.05 quality %.In addition, from improving resistance to hygroscopic viewpoint further, below 0.12 quality % is more preferably.Further, Na, K are the total amount of Na, K scaled value in the compound of Na, K monomer and Na, K respectively.
< surplus and other compositions >
The surplus of flux-cored wire is Fe and inevitable impurity.As inevitable impurity, such as, can P, S, Ni, Cr, Mo, V, Nb, Sn etc. be enumerated, also no problem containing below 0.05 quality % separately.
In addition, in order to adjusting strength, also can add Mn is 1.0 ~ 3.0 quality %, and as slag formation agent, also can add Zr is 0.01 ~ 0.50 quality %, Al 2o 3be 0.01 ~ 0.20 quality %.
The manufacture method > of < flux-cored wire
As the manufacture method of flux-cored wire, have scatter solder flux on the length direction of band steel after, be configured as circular cross-section and the method for wire drawing in the mode making it to wrap up, and in the steel pipe of particle size filling flux and carry out the method for wire drawing.But, because which kind of method does not affect the present invention, so can with the manufacture of any one method.Also have seamless and seamed, but be also which kind of can.About the composition of crust without any need for regulation, but consider from cost aspect and stringiness aspect, the general material using mild steel.In addition, also have and implement copper-plated situation on surface, but all harmless with or without plating.
Secondly, the restriction reason for welding condition is described.
< welding torch angle of inclination: 55 ~ 85 ° of >
As shown in Fig. 1 (a), (b), so-called welding torch angle of inclination A is exactly from welding direct of travel, the angle of the inclination that the center line watching welding torch 1 is formed with the fore and aft axis welded.At this, Fig. 1 (a) is the figure of the figure based on JIS Z 3001, Fig. 1 (b) is the figure being assumed to be embodiments of the present invention.Further, symbol 2 is mother metals, and 2a is upper plate (riser), 2b lower plate (transverse slat).
When carrying out standing to fillet welding, in order to make the electric arc angle of encounter root of weld guarantee fusion penetration, welding torch angle of inclination is generally the angle of more than 90 °.But when little leg length angle welding, just create the needs of a small amount of deposition amount and as far as possible low welding current, electric arc is unstable, and weld seam has the tendency that easily arrangement is uneven thus.In the present invention, welding torch angle of inclination is 55 ~ 85 °, be relative to existing more than 90 ° and lower than 90 ° welding torch angle of inclination (namely, for backward welding), thus can realize constructing with the low welding current of arc stability, make weld metal be little leg length, and make weld seam neat and consistent.The present invention like this be in the past shown in the new construction method that adopted.
In welding, make welding torch angle of inclination be 55 ~ 85 °, electric arc occurs in fusion pool, even if also can reach stable welding in low current region, can implement good little leg length and stand to fillet welding.If welding torch angle of inclination is more than 85 °, then electric arc is difficult to occur in fusion pool, and electric arc is unstable, and weld seam is irregular.On the other hand, if welding torch angle of inclination is lower than 55 °, then, under arc force effect, motlten metal flows downward, and therefore becomes convex welding bead.Therefore, welding torch angle of inclination is 55 ~ 85 °.Preferred lower limit is 65 °, and the preferred upper limit is 75 °.If make welding torch angle of inclination be more than 65 °, the sagging minimizing of the motlten metal that arc force causes.Therefore, angle of inclination is preferably more than 65 °.In addition, if make welding torch angle of inclination be less than 75 °, then electric arc occurs at motlten metal, therefore, it is possible to reach stable welding, stable welding bead marshalling is consistent.Therefore, angle of inclination is preferably less than 75 °.
< welding current: 100 ~ 180A>
When welding current is lower than 100A, electric arc is unstable, and weld seam is irregular.On the other hand, if welding current is more than 180A, then deposition quantitative change is many, therefore cannot reach the long welding of little leg.Therefore, welding current is 100 ~ 180A.Preferred lower limit is 110A, and the preferred upper limit is 150A.If welding current is more than 110A, then arc stability, weld bead shape is good.Therefore, preferred weld electric current is at more than 110A.In addition, if at below 150A, deposition amount obtains optimization, easily carries out the long welding of little leg.Therefore, welding current is preferably below 150A.
< welding wire gives prominence to length: 5 ~ 30mm>
As shown in Figure 2, so-called welding wire gives prominence to length L, refers to the distance from the front end of tip 3 to mother metal 2.
Give prominence to length by welding wire to become appropriate welding wire and give prominence to length, adjustable welding wire feed amount, suitable deposition amount can be reached for the long welding of little leg.When welding wire gives prominence to length lower than 5mm, in welding, easily there is splashing to accumulate on torch-tip, stable welding can not be implemented.On the other hand, if welding wire gives prominence to length more than 30mm, then deposition quantitative change is many, therefore cannot reach the long welding of little leg.Therefore, welding wire gives prominence to length is 5 ~ 30mm.Preferred lower limit is 10mm, and the preferred upper limit is 20mm.If it is more than 10mm that welding wire gives prominence to length, then arc stability is good.Therefore, welding wire is given prominence to length and is preferably more than 10mm.In addition, if welding wire gives prominence to length at below 20mm, then deposition amount obtains optimization, easily carries out the long welding of little leg.Therefore, welding wire is given prominence to length and is preferably below 20mm.
In welding condition, other condition does not have special provision, as an example, can adopt following condition: the source of welding current and polarity: 350A specification thyristor supply and DCEP, speed of welding: 300 ~ 400mm/min, protective gas kind: 100 volume %CO 2, shield gas flow rate: 15 ~ 50L/min.
" other "
The leg length of < weld metal: below 5.0mm >
Fig. 3 is the ideograph of the leg length representing weld metal.From the view point of thermal strain, the desired value of leg length (going up both leg length and lower leg length) is below 5.0mm.If leg length is larger than 5.0mm, then increase with heat input, welding position is distorted.Therefore, leg length is below 5.0mm.From the view point of suppressing heat input to increase further, leg length is preferably below 4.0mm.
Condition as other is not particularly limited, but preferably following condition.
< gap: 0 ~ 1mm>
If gap is below 1mm, then easily reaches little leg length fillet welding, be difficult to deform at weld.In addition, motlten metal is difficult to sagging and easily reaches good weld bead shape.Therefore, gap is preferably 0 ~ 1mm.
< thickness of slab: more than 3mm >
If thickness of slab is at more than 3mm, then under arc force and heat input effect, motlten metal is not penetrated into the possibility at the steel plate back side.Therefore, preferred thickness of slab is more than 3mm.Further, more than 5mm is more preferably.
< gage of wire: 1.0 ~ 1.2mm>
If gage of wire is at more than 1.0mm, then welding wire is difficult to buckling occurs.On the other hand, if gage of wire is at below 1.2mm, even if then under low welding current, electric arc is also easily stablized, and therefore easily reaches good weld bead shape.Therefore, gage of wire is preferably 1.0 ~ 1.2mm.
< solder flux pack completeness: 10 ~ 25 quality %>
If the solder flux pack completeness in welding wire gross mass is more than 10 quality %, then the stability of electric arc is more good, and the generating capacity that splashes reduces, and welding operation improves.On the other hand, if at below 25 quality %, be then difficult to welding wire broken string occurs, or powder overflows situations such as dropping in the filling of solder flux, productivity ratio is difficult to deterioration.Therefore, solder flux pack completeness is preferably 10 ~ 25 quality %.
< straight line arc manipulation carries out welding >
In welding method of the present invention, the arc manipulation of flux-cored wire is preferably made to be that straight line arc manipulation welds.In this case, in the welding of the leg length as below 5.0mm, arc stability is also excellent, and can obtain good weld bead shape with individual layer layer.But, be not limited to straight line arc manipulation, even when other arc manipulations, also can suitably weld.
Next, the example for the welding step of gas-shielded arc welding method of the present invention is described.Further, beyond condition given to this invention, because same with existing known welding step, so detailed description is omitted.
First, all the preparation (weld preparation operation) for carrying out vertical upwards gas shielded arc welding is done, as prepared mother metal and welding wire, the various settings etc. of welder.Secondly, welding torch angle of inclination is set as 55 ~ 85 ° (welding torch angle of inclination setting operations).Then, welding wire being given prominence to length setting is 5 ~ 30mm (welding wire gives prominence to length setting operation).Then, the welding current of 100 ~ 180A is circulated (electric current supply operation) on welding wire, carry out vertical upwards gas shielded arc welding.Further, the order of each operation after weld preparation operation does not have special provision, carries out in no particular order.In addition, also can carry out simultaneously.
[embodiment]
Below, in order to effect of the present invention is described, will the embodiment of scope of the present invention be in, and the comparative example departed from the scope of the present invention comparative descriptions in addition.
(welding wire manufacture method)
First, band steel is given along longitudinally, while be configured as open pipe by forming rolls.Secondly, in open pipe, as table 1,2 chemical composition, fill the solder flux being added with slag formation agent, deoxidier, arc stabilizer, metal or alloy, Fe powder etc. in the desired amount.Then, circle be processed in cross section and be made into flux-cored wire.Thereafter, welding wire is processed by cold drawing and reaches the gage of wire of 1.2mm.Further, annealing is implemented in order to make the welding wire that there occurs work hardening in cold working way soften.
Use this flux-cored wire, implement welding with the condition shown in table 1,2.In table 1,2, under numerical value, draw underscore for what do not meet scope of the present invention.
[table 1]
[table 2]
Other welding condition is as follows.
[welding condition]
The source of welding current, polarity: 350A specification thyristor supply, DCEP
Welding posture: upwards stand
Speed of welding: 300 ~ 400mm/min
Protective gas kind: 100 volume %CO 2
Shield gas flow rate: 25L/min
Gage of wire: 1.2mm
Solder flux pack completeness: 15.0 quality %
Steel plate: JIS G 3101 SS400 thickness 6.0mm
Then, the leg measuring weld metal is long, and carries out following evaluation.
< leg length >
Leg length measures upper leg (upper leg is long) and lower leg (lower leg is long) both (with reference to Fig. 3).
< is out of shape >
About distortion, when leg length is below 5.0mm, weld part is unconfirmed to distortion, and when leg length is larger than 5.0mm, weld part confirms distortion.Therefore, being "○" when leg length is below 5.0mm, is "×" when leg length is larger than 5.0mm.
< arc stability >
About arc stability, with sensory evaluation.
Splash less and continuous arcing occur time be " ◎ ", continuous print electric arc generation time be "○", be "×" when confirming current interruption.
< weld bead shape >
About weld bead shape, by sensory evaluation.
In welding bead, be " ◎ " when confirming excellent smoothness, being "○" time level and smooth, is "×" during convex.
(overall merit)
As overall merit,
Be " ◎ " when distortion "○", arc stability " ◎ ", weld bead shape " ◎ "
Distortion "○", arc stability " ◎ ", weld bead shape "○" time, or distortion "○", arc stability "○", weld bead shape " ◎ " time be " zero ~ ◎ "
Be "○" when distortion "○", arc stability "○", weld bead shape "○"
Be "×" during any one project "×".
These results are presented in table 3,4.
[table 3]
[table 4]
As shown in table 3, No.1 ~ 17 are because meet scope of the present invention, so can obtain good result in each evaluation.
On the other hand, No.18 ~ 26 are not because meet scope of the present invention, so can not get good result.
No.18,19 is because welding torch angle of inclination exceedes higher limit, so electric arc deficient in stability, welding bead becomes irregular.
No.20 is because welding torch angle of inclination, lower than lower limit, so under arc force, motlten metal flows downward, becomes convex welding bead.
No.21 is because welding current is lower than lower limit, so electric arc is unstable, welding bead becomes irregular.
No.22 is because welding current exceedes higher limit, so leg length is more than 5.0mm, weld part deforms.
No.23, because welding wire gives prominence to length lower than lower limit, so splash enter nozzle, cannot carry out stable welding.Therefore, arc stability, weld bead shape is poor.
No.24 is because welding wire is given prominence to length and exceeded higher limit, so leg length is more than 5.0mm, weld part deforms.
No.25 is because TiO 2content lower than lower limit, so motlten metal is sagging, become convex welding bead.
No.26 is because TiO 2content exceed higher limit, so electric arc encounters welding slag, electric arc is unstable, and welding bead becomes irregular.
Above, show that embodiment and embodiment are illustrated in detail, but aim of the present invention does not limit for the present invention by described content, its interest field must based on extensive interpretation described in the scope of Patent right requirement.Further, much less content of the present invention, also can carry out changing based on described record, change etc. certainly widely.
[explanation of symbol]
1 welding torch
2 mother metals
2a upper plate (riser)
2b lower plate (transverse slat)
3 tips
A welding torch angle of inclination
L welding wire gives prominence to length

Claims (5)

1. a vertical upwards gas-shielded arc welding method, is the use of the vertical upwards gas-shielded arc welding method of gas shielded arc welding titanium dioxide flux-cored wire, it is characterized in that, use relative to welding wire gross mass, containing TiO 2: the gas shielded arc welding titanium dioxide flux-cored wire of 4.5 ~ 8.0 quality %, and with welding torch angle of inclination: 55 ~ 85 °, welding current: 100 ~ 180A, welding wire gives prominence to length: 5 ~ 30mm is welding condition.
2. vertical upwards gas-shielded arc welding method according to claim 1; it is characterized in that; described flux-cored wire relative to welding wire gross mass, the total containing C:0.03 ~ 0.10 quality %, Si:0.8 ~ 1.3 quality %, Al:0.10 ~ 0.50 quality %, Na and K: 0.03 ~ 0.15 quality %.
3. vertical upwards gas-shielded arc welding method according to claim 1, is characterized in that, make the arc manipulation of described flux-cored wire be that straight line arc manipulation welds.
4. vertical upwards gas-shielded arc welding method according to claim 2, is characterized in that, make the arc manipulation of described flux-cored wire be that straight line arc manipulation welds.
5. vertical upwards gas-shielded arc welding method according to any one of claim 1 to 4, it is characterized in that, the leg length of weld metal is below 5.0mm.
CN201410489826.9A 2013-10-03 2014-09-23 Found upward gas-shielded arc welding method Active CN104511683B (en)

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JP2013-208508 2013-10-03
JP2013208508A JP6040133B2 (en) 2013-10-03 2013-10-03 Gas shield arc welding method

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CN104511683A true CN104511683A (en) 2015-04-15
CN104511683B CN104511683B (en) 2019-07-05

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CN111604624A (en) * 2020-05-29 2020-09-01 广船国际有限公司 Test device for obtaining weld heat cracks and evaluation method

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