CN106001867A - Multi-electrode single-surface single-layer submerged-arc welding method - Google Patents
Multi-electrode single-surface single-layer submerged-arc welding method Download PDFInfo
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- CN106001867A CN106001867A CN201610112908.0A CN201610112908A CN106001867A CN 106001867 A CN106001867 A CN 106001867A CN 201610112908 A CN201610112908 A CN 201610112908A CN 106001867 A CN106001867 A CN 106001867A
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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
- B23K9/18—Submerged-arc welding
- B23K9/186—Submerged-arc welding making use of a consumable electrodes
- B23K9/188—Submerged-arc welding making use of a consumable electrodes making use of several electrodes
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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
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
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Abstract
A multi-electrode single-surface single-layer submerged-arc welding method, by which high temperature cracks are avoided and back face welding channel have excellent shape even in a thick board, is provided and includes the following characters: a bottom electrode of a first electrode is conencted to negative pole under DC, wherein the distance between the first electrode (15a) and a second electrode (15b) is 80-160 mm. The distance between the second electrode (15b) and the third electrode (15c) L2 is 80-160 mm. The voltage of the first electrode is 25-40 V and the current of the second electrode is 800-1400 A.
Description
Technical field
The present invention relates to the multi-electrode single-surface single-layer submerged-arc welding method of the welding using multiple electrode to carry out single-surface single-layer.
Background technology
Multi-electrode one side submerged-arc welding be as jigsaw butt welding centered by shipbuilding, be applied to the high efficiency of wide spectrum
Welding procedure method.As the multi-electrode realizing such high efficiency unilateral submerged-arc welding method, disclose various welding method.
Such as, disclosed in patent documentation 1, there is a kind of submerged-arc welding method, be to carry out with single or more than 2 electrodes
The submerged-arc welding method of welding, it is characterised in that the first electrode uses the welding weldering containing rare earth element 0.01～1 mass %
Silk, the polarity making described electrode is straight polarity or exchange.
It addition, such as, having a kind of multiple-electrode submerged arc weld method disclosed in patent documentation 2, they are many more than three electrodes
In electrode welding, the first electrode and the second electrode are suitable for the welding wire of below gage of wire 3.2mm, and the first electrode is more than 800A's
Electric current, and make welding current divided by electric current density obtained by welding wire sectional area, the first electrode is 145A/mm2Above, the second electrode
For 95A/mm2Above.
[prior art literature]
[patent documentation]
Patent documentation 1: Japanese Unexamined Patent Publication 2010-221296 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2007-268564 publication
But, the welding method described in patent documentation 1, if with alternating current (Alternating Current；AC) weld
Connect, then, under the influence of constant voltage characteristic, welding wire gives speed without unfixing.Therefore, the welding method described in patent documentation 1
In, there is the such problem of shape stability of the back bead being difficult to ensure that slab.It addition, in the weldering described in patent documentation 1
Connecing in method, because there is no the definition of interelectrode distance, being susceptible to the such problem of heat cracking so existing.
It addition, the welding method described in patent documentation 2, because the welding wire of the gage of wire of the first electrode and the second electrode is straight
Footpath is thin, so heat input is suppressed, although can expect toughness deterioration and the heat affected area (Heat of heat affected zone
Affected Zone；The minimizing of softening (HAZ softening) HAZ), but the fusion penetration narrowed width of root, exist and be susceptible to high temperature
The such problem of crackle.It addition, the welding method described in patent documentation 2 does not has the definition of interelectrode distance yet, therefore with patent
Welding method described in document 1 similarly there are and is susceptible to the such problem of heat cracking.
Additionally, comprise described patent documentation 1,2, in existing multi-electrode single-surface single-layer submerged-arc welding, in general,
Having along with the shape becoming slab back bead easily becomes pears type, the incidence rate at heat cracking rises such problem.Cause
This, when carrying out multi-electrode single-surface single-layer submerged-arc welding, in order to make the incidence rate of the heat cracking of plank side reduce, it has to use sacrificial
The condition of the shape of domestic animal back bead.
Summary of the invention
The present invention is formed in view of described problem points, and its problem is, it is provided that be also difficult to occur in slab even if a kind of
Heat cracking, the multi-electrode single-surface single-layer submerged-arc welding method that the shape of back bead is the best.
Solve the multi-electrode single-surface single-layer submerged-arc welding method of the present invention of described problem, be to use multiple electrodes to carry out one side
The multi-electrode single-surface single-layer submerged-arc welding method of the welding of monolayer, it is characterised in that weld with following condition, the first electrode
Polarity: direct current bottom electrode side joint is born；First electrode and the interelectrode distance of the second electrode: more than 80mm and below 160mm；Second
Electrode and the interelectrode distance of the 3rd electrode: more than 80mm and below 160mm；The voltage of the first electrode: 25～40V；Second electricity
The electric current of pole: 800～1400A.
So, the multi-electrode single-surface single-layer submerged-arc welding method of the present invention because make the polarity of the first electrode, the first electrode and
The interelectrode distance of the second electrode, the second electrode and the interelectrode distance of the 3rd electrode, the voltage of the first electrode, the second electrode
Electric current is specific condition, so heat cracking is difficult to occur, it is possible to the shape making back bead is good.
The multi-electrode single-surface single-layer submerged-arc welding method of the present invention, the gage of wire of the most described first electrode be φ 4.0～
6.4mm。
According to such welding method, can realize stable fusion penetration, back bead is more stable.It addition, according to such weldering
Connect method, it is possible to substantially ensure that the fusion penetration width of root, even if therefore when welding slab, it is also possible to make heat cracking be more difficult to
Occur.
The multi-electrode single-surface single-layer submerged-arc welding method of the present invention, the gage of wire of the most described second electrode be φ 4.0～
6.4mm, the gage of wire of described 3rd electrode is φ 4.0～6.4mm.
According to such welding method, can realize stable fusion penetration, back bead is more stable.It addition, according to such weldering
Connect method, it is possible to substantially ensure that the fusion penetration width of root, even if therefore when welding slab, it is also possible to make heat cracking be more difficult to
Occur.
The multi-electrode single-surface single-layer submerged-arc welding method of the present invention, the electric current of the most described first electrode is 1000～1600A.
According to such welding method, the first electrode is not up to excessive current, and current value is in suitable scope, therefore
Back bead is more stable.It addition, according to such welding method, because the fusion penetration width of root can be guaranteed fully, so
Even if during welding slab, it is also possible to make heat cracking be more difficult to occur.
The multi-electrode single-surface single-layer submerged-arc welding method of the present invention, the voltage of the most described second electrode is 40～50V.
According to such welding method, the second electrode is not up to too high voltages, and magnitude of voltage is in suitable scope, therefore
Back bead is more stable.It addition, according to such welding method, because the fusion penetration width of root can be substantially ensured that, so i.e.
When making welding slab, it is also possible to make heat cracking be more difficult to occur.
The multi-electrode single-surface single-layer submerged-arc welding method of the present invention, the polarity of the most described second electrode is alternating current, described
The polarity of the 3rd electrode is alternating current.
According to such welding method, it is possible to make the chemical composition of welding wire be retained in a large number in welding metal, therefore weld
The yield of the chemical composition of metal is more stable, it is possible to the character (impact property (toughness) specifically) making machinery is good.
The multi-electrode single-surface single-layer submerged-arc welding method of the present invention, because determining all conditions of the polarity etc. of the first electrode,
Even if so being also difficult to heat cracking in slab, it is possible to the shape making back bead is the best.
Accompanying drawing explanation
Fig. 1 is the profile of the welder of the multi-electrode single-surface single-layer submerged-arc welding method for the present invention.
Fig. 2 is the top view of the steel plate welded with the multi-electrode single-surface single-layer submerged-arc welding method of the present invention.
Fig. 3 is the profile of the steel plate periphery representing situation when carrying out multi-electrode single-surface single-layer submerged-arc welding.
Fig. 4 is the profile of the steel plate periphery representing situation when carrying out multi-electrode single-surface single-layer submerged-arc welding.
Fig. 5 is for prominent long with regard to the interelectrode distance in the multi-electrode single-surface single-layer submerged-arc welding method of the present invention and welding wire
The profile that degree illustrates.
Fig. 6 is the profile of the steel plate periphery for illustrating with regard to the high-temperature cracking resistance of embodiment.
Detailed description of the invention
Hereinafter, the mode for the enforcement of the present invention is illustrated in detail.The multi-electrode single-surface single-layer submerged arc of the present invention
Soldering method (following, the most also it is only called " welding method ".), such as, it is to use 3 or 4 electrodes carry out the weldering of single-surface single-layer
The method connect.And, in the welding method of the present invention, it is determined that the polarity of electrode, interelectrode distance, the voltage of electrode, electrode
Electric current, determine gage of wire and the polarity etc. of electrode as preferred mode.
First, just the outline of major part of welder of welding method and steel plate for the present invention illustrates.
(welder)
As it is shown in figure 1, welder 100, mainly possess pier base framework 11, welding machine 12, welding machine crossbeam 13.
Pier base framework 11, with the square material of steel as framework, is formed in the way of cross section is seen concavely, and top is open, interior
Portion is supported with the cushion device 50a shown in Fig. 3, Fig. 4 or cushion device 50b.Then, at the liner copper coin 55 of cushion device 50a
Or it is placed with steel plate 20 on the fire-resistant tarpaulin 56 of cushion device 50b.
Welding machine crossbeam 13 makes welding machine 12 move along the longitudinally of steel plate 20.
Welding machine 12 is arranged in the top (top of steel plate 20) of pier base framework 11, from the bevel for welding portion M (reference of steel plate 20
Face side welding steel 20 Fig. 2).Welding machine 12 possesses multiple electrode (welding torch) 15.Welding machine 12 while along welding machine crossbeam 13 with
Fixing speed moves, from the face side of bevel for welding portion M, by electrode 15 by one side submerged arc welding steel plate 20.Further,
Welding machine 12 shown in Fig. 1, as shown in the arrow in figure, moves from left to right, while carrying out the welding of steel plate 20.
Here, the multi-electrode single-surface single-layer submerged-arc welding method belonging to the present invention, as shown in Figure 3, Figure 4, from docking
Steel plate 20 and the back side of steel plate 20, intersperse among the liner solder flux 52 on liner copper coin 55, or be housed in fire-resistant tarpaulin 56 with stratiform
Interior liner solder flux 52, the method carrying out welding with monolayer by the upper pushing mechanism pressing of air hose 59 grade.At multi-electrode
In single-surface single-layer submerged-arc welding method, carry out submerged-arc welding from the face side use table solder flux 51 of steel plate 20, the surface of steel plate 20 with
The back side concurrently forms welding bead.Further, in Fig. 3, Fig. 4, symbol 53 is slag, and symbol 54 is welding metal, and symbol 57 is heat-resisting
Cover, symbol 58 is backing solder flux.
(steel plate)
As steel plate 20, can enumerate and such as make ship plate, its length for example, 10～30m.As in figure 2 it is shown, for this
Steel plate 20, makes steel plate 20 abut each other, and in the position of bevel for welding portion M, carries out discontinuously or the weldering of continuous print face inner position.
In top 31 and the terminal 32 of this steel plate 20, the run-on tab (Japanese original text: タ Block) 21 for processing arc crater is installed
With run-on tab 22.
(welding method)
The welding method of the present invention, uses described welder, welds with following condition, the polarity of the first electrode:
Direct current bottom electrode side joint is born；First electrode and the interelectrode distance of the second electrode: more than 80mm and below 160mm；Second electrode
Interelectrode distance with the 3rd electrode: more than 80mm and below 160mm；The voltage of the first electrode: 25～40V；Second electrode
Electric current: 800～1400A.
Further, mainly using solid core welding wire in submerged-arc welding, it is specific that its gage of wire is defined to φ 4.8mm, φ 6.4mm etc.
Nominal diameter.Then, about actual diameter, generally as comprising range of error diameter and extensive interpretation.Here, at JIS Z
In 3200:2005, the franchise of solid core welding wire used for submerged arc welding (φ 3.2mm, φ 4.0mm, φ 4.8mm, φ 6.4mm) is ±
0.06mm.Therefore, the gage of wire of regulation in the present invention, as actual diameter, comprise ± the error of φ 0.06mm.I.e., such as,
So-called gage of wire is 4.0mm φ, means as actual diameter
" φ 4.0mm ± φ 0.06mm ", so-called gage of wire is φ 4.8mm, means " φ 4.8mm as actual diameter
± φ 0.06mm ", so-called gage of wire is φ 6.4mm, means " φ 6.4mm ± φ 0.06mm " as actual diameter.Further,
Solid core welding wire is preferably used as the welding wire for each electrode.So, fusion penetration is deep, and resistance to hygroscopicity is the best.
The electrode 15 of welding machine 12, such as it is shown in figure 5, press suitable from welding direct of travel (figure, the direction shown in arrow)
Sequence, possesses the first electrode 15a, the second electrode 15b, the 3rd electrode 15c these 3.Further, electrode 15 is as required, it is also possible to tool
Including standby the 4th electrode 15d shown in dotted line in Fig. 54.If possess the 4th electrode 15d, then can make to melt
Pond (fusion pool) Sheng get Geng is full.Although electrode 15 arbitrarily can being set as 3 or 4, but the effect of the present invention being to lead to
Cross and make the first electrode 15a, the second electrode 15b, the 3rd electrode 15c be set to above-mentioned condition and be reached.
Here, as it is shown in figure 5, so-called interelectrode distance L1, L2 refer to, in the configuration of the electrode 15 when welding, make
The position the most in statu quo extended from the front end of welding wire 16a～16c prominent for each electrode 15a～15c and contact with steel plate 20
(part also, in Figure 5, making the front end of welding wire 16a～16c extend represents distance respectively with thin dotted line.).
Prominent length A1 of welding wire 16a～16c～A3 are not particularly limited, it is possible to set in common scope.Electrode
Prominent length A4 of 15 welding wire 16d when possessing the 4th electrode 15d is too.
Hereinafter, each condition is illustrated.
(polarity of the first electrode)
The polarity of the first electrode, for direct current electrode negative (Direct Current Electrode Negative；
DCEN)。
If making the polarity of the first electrode is DCEN, then welding wire can be made to give speed and fix, therefore back bead is stable.Separately
Outward, many with the welding wire deposition amount under electric current, the chemical composition of welding wire is retained in welding metal in a large number, therefore, it is possible to impacted
Performance.
If making the polarity of the first electrode is alternating current (AC), then welding wire is given speed and is not fixed, therefore in high current zone
Instability, back bead is unstable.
If making the polarity of the first electrode is direct current electrode positive (Direct Current Electrode Positive；
DCEP), then fusion penetration width is narrow, and therefore back bead is unstable.It addition, in this case, welding wire deposition amount is few, welds metal
In the yield of chemical composition of welding wire tail off, therefore can not obtain the impact property of excellence.
(the first electrode and the interelectrode distance of the second electrode)
First electrode 15a and the interelectrode distance L1 of the second electrode 15b, for more than 80mm and below 160mm.If making electrode
Spacing L1 is in this scope, then the electric arc of the first electrode 15a and the electric arc of the second electrode 15b do not disturb, therefore back side weldering
Road is stable.If it addition, make interelectrode distance L1 in this scope, then the interval of the first electrode 15a and the second electrode 15b is suitable, because of
This cool time is suitable, just can carry out the welding of the second electrode 15b before molten bath does not solidify.Therefore, at the second electrode
The welding of 15b can be deepened fusion penetration.Therefore, it is possible to make heat cracking be difficult to occur.
If interelectrode distance L1 is less than 80mm, then the electric arc of the first electrode 15a and the electric arc of the second electrode 15b occur dry
Disturbing, therefore back bead is unstable.If it addition, interelectrode distance L1 is higher than 160mm, then the first electrode 15a and the second electrode 15b
Be spaced away from, therefore cool time is elongated, molten bath solidify.Therefore, in the welding of the second electrode 15b, fusion penetration shoals, high temperature
Crackle occurs.
Further, from the viewpoint of making back bead more stable, the lower limit of interelectrode distance L1 is preferably 90mm, and the upper limit is excellent
Elect 140mm as, more preferably 120mm.
(the second electrode and the interelectrode distance of the 3rd electrode)
Second electrode 15b and the interelectrode distance L2 of the 3rd electrode 15c, for more than 80mm and below 160mm.If making electrode
Spacing L2 is in this scope, then the interval of the second electrode 15b and the 3rd electrode 15c is suitable, and therefore cool time is suitable, in molten bath
The welding of the 3rd electrode 15c just can be carried out before there is no solidification.Therefore, can deepen to melt in the welding of the 3rd electrode 15c
Deeply.Therefore, it is possible to make heat cracking be difficult to occur.
If interelectrode distance L2 is less than 80mm, then the second electrode 15b and the 3rd electrode 15c halve (セ ミ) from 2 molten baths and
Becoming 1 molten bath, therefore heat cracking occurs.If it addition, interelectrode distance L2 is higher than 160mm, the second electrode 15b and the 3rd electricity
Pole 15c is spaced away from, and therefore cool time is elongated, and molten bath solidifies.Therefore, in the welding of the 3rd electrode 15c, fusion penetration shoals,
Heat cracking occurs.
Further, from the viewpoint of occurring from making heat cracking be more difficult to, the lower limit of interelectrode distance L2 is preferably 90mm, the upper limit
It is preferably 140mm, more preferably 120mm.
(voltage of the first electrode)
The voltage of the first electrode 15a is 25～40V.If making the voltage of the first electrode 15a in this scope, then can make root
Fusion penetration width abundant, back bead is stable, and heat cracking can be made to be difficult to occur.
If the voltage of the first electrode 15a is less than 25V, then the fusion penetration narrowed width of root, therefore heat cracking occurs.Separately
Outward, if the voltage of the first electrode 15a is higher than 40V, then electric arc become too strong, and therefore back bead is unstable.
From making back bead more stable, and make heat cracking be more difficult to occur from the viewpoint of, the voltage of the first electrode 15a
Lower limit be preferably 27V, the upper limit is preferably 38V.
(electric current of the second electrode)
The electric current of the second electrode 15b is 800～1400A.If make the electric current of the second electrode 15b in this scope, then will not be right
The back bead that first electrode 15a is formed has undesirable effect, therefore, it is possible to make back bead stable.If it addition, making second
The electric current of electrode 15b in this scope, then can deepen fusion penetration in the welding of the second electrode 15b.Therefore, it is possible to make heat cracking
It is difficult to occur.
If the electric current of the second electrode 15b is less than 800A, then in the welding of the second electrode 15b, fusion penetration shoals, heat cracking
Occur.If it addition, the electric current of the second electrode 15b is higher than 1400A, then in the welding of the second electrode 15b, can be to the first electrode
The back bead that the welding of 15a is formed has undesirable effect, and back bead is unstable.
Further, from making back bead more stable, and make heat cracking be more difficult to occur from the viewpoint of, the second electrode 15b
The lower limit of electric current be preferably 850A, more preferably 900A.From the same viewpoint, the upper limit of the electric current of the second electrode 15b
It is preferably 1350A, more preferably 1300A.
Further, the thickness of slab of steel plate 20, for instance, it is possible to be 10～40mm.If the welding method of the present invention, even
The slab of more than 25mm, it is also possible to suppress heat cracking well, and make the shape of back bead good.
As welding method, such as, the steel plate 20 with bevel shape as single V groove with root face can be enumerated as object, carry out using viscous
The welding of knot solder flux.Thus, back bead is more stable.
But, it is not limited to this, it is also possible to using the steel plate of V-butt as object.Alternatively, it is also possible to be to use to melt
The welding of solder flux.
The welding method of the present invention from the description above, because making the polarity of the first electrode, the first electrode and the second electricity
The interelectrode distance of pole, the second electrode and the interelectrode distance of the 3rd electrode, the voltage of the first electrode, the electric current of the second electrode are
Specific condition, so heat cracking is difficult to occur, it is possible to the shape making back bead is good.
(other embodiments)
Further, the welding method of the present invention, occur to make heat cracking be more difficult to, and make the shape of back bead more
Well, preferably in addition to described condition, make the most in the lump the first electrode 15a, the second electrode 15b, the 3rd electrode 15c each welding wire straight
Footpath, the electric current of the first electrode 15a, the voltage of the second electrode 15b, each polarity of the second electrode 15b and the 3rd electrode 15c is following
So.
(gage of wire of the first electrode)
The gage of wire of the first electrode 15a, for example, it is preferable to be φ 4.0～6.4mm.If so, stable melting can be realized
Deeply, back bead is more stable.It addition, according to such welding method, it is possible to substantially ensure that the fusion penetration width of root, even if therefore
When welding slab, it is also possible to make heat cracking be more difficult to occur.
Further, from the viewpoint of realizing more stableization of back bead and preventing the generation of heat cracking, the first electrode
The gage of wire of 15a, the most preferably more than φ 4.8mm.
(gage of wire of the second electrode, the gage of wire of the 3rd electrode)
The gage of wire of the second electrode 15b, the most preferably φ 4.0～6.4mm, the gage of wire of the 3rd electrode 15c, example
Preferably such as φ 4.0～6.4mm.If so, then can realize stable fusion penetration, back bead is more stable.If it addition, such as
This, then can substantially ensure that the fusion penetration width of root, even if therefore when welding slab, it is also possible to makes heat cracking be more difficult to send out
Raw.
Further, from the viewpoint of realizing more stableization of back bead and preventing the generation of heat cracking, the second electrode
The gage of wire of 15b and the gage of wire of the 3rd electrode 15c, the most both preferably more than 4.8mm φ.
(electric current of the first electrode)
The electric current of the first electrode 15a, the most preferably 1000～1600A.If so, the first electrode 15a electric current will not
Too high, current value is in suitable scope, and therefore back bead is more stable.It addition, according to such welding method, it is possible to fully
Guarantee the fusion penetration width of root, even if therefore when welding slab, it is also possible to make heat cracking be more difficult to occur.
Further, from the viewpoint of realizing more stableization of back bead and preventing the generation of heat cracking, the first electrode
The lower limit of the electric current of 15a, the most preferably 1100A, more preferably 1150A.From it addition, from the viewpoint of Tong Yang, the first electrode
The upper limit of the electric current of 15a, the most preferably 1550A, more preferably 1400A.
The scope of the current value of described first electrode 15a is only to illustrate preferred numerical range, and is not limited to this.The
The current value of one electrode 15a, such as, it is also possible to for 950A or 1650A.Nonetheless, back bead is the most sufficiently stable, still is able to
Make the most difficult generation of heat cracking.
(voltage of the second electrode)
The voltage of the second electrode 15b, for example, it is preferable to be 40～50V.If so, the second electrode 15b voltage will not mistake
Height, magnitude of voltage is in suitable scope, and therefore back bead is more stable.It addition, the fusion penetration width of root can be substantially ensured that, because of
Even if during this welding slab, it is also possible to make heat cracking be more difficult to occur.
Further, from the viewpoint of realizing making more stableization of back bead and preventing the generation of heat cracking, the second electricity
The lower limit of the voltage of pole 15b, for example, it is preferable to be 42V, more preferably 44V.It addition, from the same viewpoint, the second electrode
The upper limit of the voltage of 15b, for example, it is preferable to be 48V, more preferably 46V.
The scope of the magnitude of voltage of described second electrode 15b is only to illustrate preferred numerical range, is not limited to this.The
The magnitude of voltage of two electrode 15b, such as, it is also possible to for 38V or 53V.Nonetheless, back bead is the most sufficiently stable, it is also possible to make
Heat cracking is very difficult to occur.
(polarity of the second electrode, the polarity of the 3rd electrode)
The polarity of the second electrode 15b and the polarity of the 3rd electrode 15c, it is possible to for AC, DCEN or DCEP etc., but the most preferred
AC.If making the polarity of the second electrode 15b and the polarity of the 3rd electrode 15c is AC, then the chemical composition of welding wire can be made to protect in a large number
Staying in welding metal, the yield of the chemical composition therefore welding metal is more stable, it is possible to make the well-behaved of machinery.
Further, there is no above-mentioned condition, suitably set with usual terms and can implement.As common condition, such as, close
In the magnitude of voltage of the first electrode 15a, 25～40V can be enumerated as, about the current value of the second electrode 15b, can be enumerated as 700～
1400A。
It addition, such as, about the current value of the 3rd electrode 15c, 700～1300A can be enumerated as, about magnitude of voltage, can arrange
Lift 43～46V.
Additionally, such as, about the gage of wire of the 4th electrode 15d, 4.0～6.8mm φ can be enumerated as, about current value,
700～1500A can be enumerated as, 40～50V can be enumerated as about magnitude of voltage.
The interelectrode distance of the 3rd electrode 15c and the 4th electrode 15d can arbitrarily set.
It is not particularly limited about the gage of wire of the 4th electrode 15d, magnitude of voltage, current value, polarity etc. and preferred model
Enclose, it is possible to carry out with common condition.As the condition that this is common, for instance, it is possible to be gage of wire: φ 6.4mm, magnitude of voltage:
46V, current value: 1300A, polarity: AC, DCEN or DCEP etc..
It addition, about speed of welding, 42～90cm/min can be enumerated as.Further, these conditions are of course not said and are limited by it
Fixed.
(outline of welding)
It follows that with reference to Fig. 1～5, (following example is three for applying the multi-electrode of the welding method of the present invention
Electrode) outline of single-surface single-layer submerged-arc welding illustrates.
(preparatory process)
In preparatory process, first, prepare run-on tab 21 and run-on tab 22 are installed, can carry out discontinuously or in continuous print face
The steel plate 20 of tack welding and steel plate 20.Secondly, at the upper surface of the liner copper coin 55 of cushion device 50a, by not shown weldering
Agent feed mechanism supply liner solder flux 52.Or, the upper surface of the heat-resisting cover 57 in the fire-resistant tarpaulin 56 of cushion device 50b,
By not shown solder flux feed mechanism supply backing solder flux 58, then supply liner solder flux 52 thereon.
Then, steel plate 20 and steel plate 20 are placed on welder 100, make to be formed by steel plate 20 and steel plate 20
Bevel for welding portion M is arranged in cushion device 50a or the top of cushion device 50b.Then, not shown driving means is made to operate,
It is finely adjusted whole in the way of making liner copper coin 55 or fire-resistant tarpaulin 56 be positioned at the underface of bevel for welding portion M.
Then, import compressed air to air hose 59, make air hose 59 expand and liner copper coin 55 or backing are welded
Agent 58 is pressed against the rear side of bevel for welding portion M, by liner solder flux 52 by the back side of bevel for welding portion M.
(electrode adjustment operation)
Adjust in operation at electrode, make the polarity of the first electrode and 3 each interelectrode distance L1, L2 become described condition and
It is adjusted.Further, preparatory process and electrode adjust the order of operation does not has special provision, which operation before can, also
Can carry out simultaneously.
(welding sequence)
In welding sequence, first, the welding machine 12 making welder 100 moves to the position that welding starts.Secondly, the is made
The magnitude of voltage of one electrode 15a and the current value of the second electrode 15b become described condition and are supplied respectively to voltage and current, make welding machine
12 operatings.Then, from the top 31 of steel plate 20 towards terminal 32, make welding machine 12 move with fixing speed along welding machine crossbeam 13
Dynamic, supply schedule solder flux 51, welding steel 20 and steel plate 20.
[embodiment]
Hereinafter, for including the embodiment of the scope of the present invention in, with regard to its effect and the comparative example departed from the scope of the present invention
Compare and be illustrated.
For forming bevelled 2 steel plates at end face, the mutually opposing docking of end face is made to form Y-shaped groove.This Y word
Shape groove, bevel angle is 45 °, 50 °, 60 °, and root face is 3～6mm, and root gap is 0mm.It addition, in the present embodiment, steel
The a length of 1.2m of plate, the thickness of steel plate is 12～40mm.Further, about bevel angle, thickness of slab 12mm for 60 °, 32mm's
Be 45 °, 40mm for 45 °.The composition of this steel plate, the composition of welding wire of use and the composition of solder flux show in table 1 below.
[table 1]
Surplus: Fe and inevitable impurity
Surplus: Fe and inevitable impurity
Other are B2O3And CaCO3Deng
For this steel plate, carry out the single-surface single-layer of 3 electrodes or 4 electrodes with the condition shown in table 2, the No.1 of table 3～69
Submerged-arc welding, carries out following evaluation.
Welder uses has the cushion device 50b shown in cushion device 50a or Fig. 4 shown in Fig. 3, as
Table solder flux uses sintered flux.Further, the condition beyond table 2 and the condition shown in table 3 is existing known condition, entirely phase
Same condition.Further, the logarithm value picture underscore being unsatisfactory for the scope of the present invention represents.In table 2 and table 3, blank column represents not
4th electrode is set.
(weld bead shape)
Weld bead shape evaluates back bead with visualization.In back bead, reinforcement is 2～4mm, and, reinforcement and weldering
Road width general uniform is extremely good (◎), and reinforcement is 2～4mm, and, reinforcement and weld width are slightly owed to be good uniformly
Good (zero).It addition, in back bead, remaining Sheng is very few or superfluous, and undercut is multiple, and weld width is uneven, or outside welding bead
See bad for difference (×).
(high-temperature cracking resistance)
As shown in Figure 6, the welding method of the present invention welding metal formed, the first electrode the welding metal formed
60, the second electrode is formed welding metal 61, only golden by the 3rd electrode or the welding that formed by the 3rd electrode and the 4th electrode
Belong to 62 compositions.
Its dendrite of tissue of the welding metal 60 that first electrode occurs the most laterally is grown up, and is susceptible to heat cracking.Therefore,
The welding metal that second electrode occurs is deep fusion penetration, melts the tissue of this fragility, thus high-temperature cracking resistance becomes good.
Therefore, by cross section macrostructure, the second electrode and the 3rd electrode (or second～the 4th electrode) institute's shape is evaluated in measurement
The welding metal 61 become and fusion penetration degree of depth T of welding metal 62.Surface (upper table if the thickness of slab of steel plate 20 is t, away from steel plate 20
Face), the welding metal 61 that formed with the second electrode and the 3rd electrode (or second～the 4th electrode) and welding metal 62 molten
When deep degree T is in the relation of " 14/16t≤T ＜ 16/16t ", high-temperature cracking resistance is very good (◎), be in " 12/16t≤
T ＜ 14/16t " relation time, high-temperature cracking resistance good (zero), is not during the relation of " T ＜ 12/16t " or " T >=16/16t "
Good (×).
(impact property)
Carried out by the pendulum impact test according to JIS Z 2242:2005.Further, in pendulum impact test, test temperature
Impact absorbing at spending-20 DEG C can (vE-20 DEG C) be more than 70J, and impact property is very good (◎), more than 50J and low
In 70J, impact property is good (zero), impact property less than 50J poor (×).
[table 2]
[table 3]
As shown in table 2, the sample of No.1～42, because meeting the scope of the present invention, whole assessment items is good.Especially
Being the sample of No.1,8～12,15,22,24,25,27,35～37, whole assessment items is the best.
In contrast, as shown in table 3, the sample of No.43～69 because being unsatisfactory for the scope of the present invention, thus become with
Under result.
The sample of No.43,52,61, because the polarity of the first electrode is exchange, so the shape defect of back bead.
The sample of No.44,53,62, because the polarity of the first electrode is direct current electrode positive, so the shape of back bead
Bad.It addition, its impact property is the poorest.
The sample of No.45,54,63, because the interelectrode distance of the first electrode and the second electrode is less than lower limit, so the back of the body
The shape defect of face welding bead.
The sample of No.46,55,64, because the interelectrode distance of the first electrode and the second electrode is higher than higher limit, thus resistance to
Heat cracking is bad.
The sample of No.47,56,65, because the interelectrode distance of the second electrode and the 3rd electrode is less than lower limit, thus resistance to
Heat cracking is bad.
The sample of No.48,57,66, because the interelectrode distance of the second electrode and the 3rd electrode is higher than higher limit, thus resistance to
Heat cracking is bad.
The sample of No.49,58,67, because the magnitude of voltage of the first electrode is less than lower limit, so high-temperature cracking resistance is not
Good.
The sample of No.50,59,68, because the magnitude of voltage of the first electrode is higher than higher limit, so the shape of back bead is not
Good.
The sample of No.51, because the current value of the second electrode is less than lower limit, so high-temperature cracking resistance is bad.
No.60, the sample of 69, because the current value of the second electrode is higher than higher limit, so the shape defect of back bead.
[explanation of symbol]
11 pier base frameworks
12 welding machines
13 welding machine crossbeams
15 electrodes
15a the first electrode
15b the second electrode
15c the 3rd electrode
15d the 4th electrode
16a～16d welding wire
17a～17d welding torch
20 steel plates
21,22 run-on tabs
31 tops
32 terminals
50a, 50b cushion device
51 table solder flux
52 liner solder flux
53 slags
54 welding metals
55 liner copper coins
56 fire-resistant tarpaulins
57 heat-resisting covers
58 backing solder flux
59 air hoses
The welding metal that 60 are formed by the first electrode
The welding metal that 61 are formed by the second electrode
62 by the 3rd electrode, or the welding metal formed by the 3rd electrode and the 4th electrode
100 welders
A1～A4 welding wire highlights length
L1, L2 interelectrode distance
Welding metal 61 that T is formed by the second electrode and the 3rd electrode (or second～the 4th electrode) and welding
The fusion penetration degree of depth of metal 62
T thickness of slab
Claims (9)
1. a multi-electrode single-surface single-layer submerged-arc welding method, is the multi-electrode list of welding using multiple electrodes to carry out single-surface single-layer
Face monolayer submerged-arc welding method, it is characterised in that weld with following condition:
The polarity of the first electrode: direct current bottom electrode side joint is born；
First electrode and the interelectrode distance of the second electrode: more than 80mm and below 160mm；
Second electrode and the interelectrode distance of the 3rd electrode: more than 80mm and below 160mm；
The voltage of the first electrode: 25～40V；
The electric current of the second electrode: 800～1400A.
Multi-electrode single-surface single-layer submerged-arc welding method the most according to claim 1, it is characterised in that the weldering of described first electrode
Filament diameter is φ 4.0～6.4mm.
Multi-electrode single-surface single-layer submerged-arc welding method the most according to claim 1, it is characterised in that the weldering of described second electrode
Filament diameter is φ 4.0～6.4mm, and the gage of wire of described 3rd electrode is φ 4.0～6.4mm.
Multi-electrode single-surface single-layer submerged-arc welding method the most according to claim 2, it is characterised in that the weldering of described second electrode
Filament diameter is φ 4.0～6.4mm, and the gage of wire of described 3rd electrode is φ 4.0～6.4mm.
Multi-electrode single-surface single-layer submerged-arc welding method the most according to claim 1, it is characterised in that the electricity of described first electrode
Stream is 1000～1600A.
Multi-electrode single-surface single-layer submerged-arc welding method the most according to claim 2, it is characterised in that the electricity of described first electrode
Stream is 1000～1600A.
Multi-electrode single-surface single-layer submerged-arc welding method the most according to claim 3, it is characterised in that the electricity of described first electrode
Stream is 1000～1600A.
Multi-electrode single-surface single-layer submerged-arc welding method the most according to any one of claim 1 to 7, it is characterised in that described
The voltage of the second electrode is 40～50V.
Multi-electrode single-surface single-layer submerged-arc welding method the most according to any one of claim 1 to 7, it is characterised in that described
The polarity of the second electrode is alternating current, and the polarity of described 3rd electrode is alternating current.
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| JP2015-073651 | 2015-03-31 | ||
| JP2015073651A JP6383319B2 (en) | 2015-03-31 | 2015-03-31 | Multi-electrode single-sided single layer submerged arc welding method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108746949A (en) * | 2018-08-02 | 2018-11-06 | 唐山开元特种焊接设备有限公司 | FCB splice joint equipment |
| CN115279528A (en) * | 2020-03-31 | 2022-11-01 | 株式会社神户制钢所 | Multi-electrode gas shielded arc single-side welding method and multi-electrode gas shielded arc single-side welding device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2023023454A (en) | 2021-08-05 | 2023-02-16 | 株式会社神戸製鋼所 | Multielectrode one-side surface submerged-arc welding method |
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| CN115279528A (en) * | 2020-03-31 | 2022-11-01 | 株式会社神户制钢所 | Multi-electrode gas shielded arc single-side welding method and multi-electrode gas shielded arc single-side welding device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6383319B2 (en) | 2018-08-29 |
| JP2016193444A (en) | 2016-11-17 |
| CN106001867B (en) | 2019-02-15 |
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