CN105382383A - Multi-electrode gas-shielded arc welding method - Google Patents
Multi-electrode gas-shielded arc welding method Download PDFInfo
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- CN105382383A CN105382383A CN201510531188.7A CN201510531188A CN105382383A CN 105382383 A CN105382383 A CN 105382383A CN 201510531188 A CN201510531188 A CN 201510531188A CN 105382383 A CN105382383 A CN 105382383A
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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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
- B23K9/1735—Arc welding or cutting making use of shielding gas and of a consumable electrode 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
- B23K9/095—Monitoring or automatic control of welding parameters
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Abstract
The invention provides a multi-electrode gas-shielded arc welding method, and the method comprises advantages of less spatter occurrence amount, good fusion capacity, good metal-welding state and deep fuse. The method comprises the following parts: a gas-shielded arc welding wire is used for a leading electrode (11) and a trailing electrode (21), a filling wire (31) is inserted to a molten metal (8) between the leading electrode (11) and the trailing electrode (21) to perform welding. The method is characterized in that: the distance between the the leading electrode (11) and the trailing electrode (21) is 15-50mm, the welding voltage VL (V) of the leading electrode (11) is 26-38V, the welding current IL (A) of the leading electrode (11) is 250-550A, the welding voltage VL (V) and the welding current IL (A) meet the requirement of 56<=VL*103/IL<=100; for the leading electrod (11), the welding wire diameter RL(mm) and the welding wire protruding length EL (mm) meet the requirement of 5<=EL/RL<=20, and in the filling wire 31, the positive current is delivered to perform welding.
Description
Technical field
The present invention relates to and employ multielectrode multielectrode gas-shielded arc welding method.
Background technology
All the time, in order to pursue the high efficiency of the horizontal fillet welding of shipbuilding or bridge, multielectrode gas-shielded arc welding method is studied.
In multi-electrode fillet weld in the flat position gas shielded arc welding; the high speed of welding is realized in order to make the stability in molten bath improve; such as; a kind of welding method is disclosed in patent document 1; it is used as leading electrode and rear row electrode by flux-cored wire for gas-shielded arc welding; filler wire is inserted in the motlten metal between leading electrode and rear row electrode, make the electric current (filler wire is negative polarity relative to motlten metal) of filler wire circulation positive polarity carry out the method for welding.In this welding method, because molten bath stabilisation can be made, so low spatter can be guaranteed and good weld bead shape, and high-speed welding can be carried out.
Prior art document
Patent document
Patent document 1: Japan Patent No. 3759114 publication
The problem that invention will solve
But, in the multielectrode gas-shielded arc welding method described in patent document 1, about dark fusion penetration effect, also have further room for improvement.
In addition, in multielectrode gas-shielded arc welding, also requirement can reduce splashing generating capacity, amalgamation is good.In addition, in multielectrode gas-shielded arc welding, also require weld bead shape and welding bead alignment good, the so-called weld metal be inhibited of pit and undercut in good condition.
Summary of the invention
Therefore, problem of the present invention is, provides a kind of splashing generating capacity few, and amalgamation is good, weld metal in good condition, can the multielectrode gas-shielded arc welding method of fusion penetration deeply.
For solving the means of problem
Multielectrode gas-shielded arc welding method of the present invention; use gas shielded arc welding welding wire at leading electrode and rear row electrode; filler wire is inserted the multielectrode gas-shielded arc welding method carrying out in the motlten metal between described leading electrode with described rear row electrode welding; it is characterized in that; anode-cathode distance between described leading electrode and described rear row electrode is 15 ~ 50mm, the weldingvoltage V of described leading electrode
l(V) be 26 ~ 38V, the welding current I of described leading electrode
l(A) be 250 ~ 550A, described weldingvoltage V
land described welding current I (V)
l(A) condition of formula (1) is met, about described leading electrode, gage of wire R
l(mm) and welding wire give prominence to length E
l(mm) meet the condition of formula (2), in described filler wire, circulation positive polarity electric current and weld.
[mathematical formulae 1]
According to such welding method, by regulation anode-cathode distance, the arc stability of leading electrode and rear row electrode, weld bead shape is good, and what splash in addition is inhibited, and resistance to pit improves.And by specifying the weldingvoltage of leading electrode, molten bath is stablized, and weld bead shape is good, and the amalgamation welding beginning portion improves.In addition, by specifying the weldingvoltage of leading electrode, can spray transfer be maintained, being suppressed of splashing, and the generation that can suppress undercut.And by specifying the welding current of leading electrode, the arc force of leading electrode improves, and fusion penetration deepens.In addition, by specifying the welding current of leading electrode, the injection of electric arc is good, can suppress to splash and the generation of undercut, and molten bath is stablized and weld bead shape is good.Further, by meeting formula (1), formula (2), molten bath is stablized, and splashes and being inhibited of undercut, and good weld bead shape and welding bead neat and consistent and dark fusion penetration can be made to take into account.And the electric current of the positive polarity that circulates in filler wire and welding, molten bath is stablized.
Further, so-called weld bead shape is good in this application, and be meant to welding bead outward appearance good, so-called weld bead shape is poor, also just means welding bead appearance poor.
In multielectrode gas-shielded arc welding method of the present invention, the deposition rate W of preferred described leading electrode
l(g/min), the deposition rate W of described rear row electrode
tand the deposition rate W of described filler wire (g/min)
f(g/min) condition of formula (3) and formula (4) is met.
[mathematical formulae 2]
According to such welding method, by meeting formula (3), dark fusion penetration and weld bead shape are more good, and by meeting formula (4), the stability in molten bath improves.
In multielectrode gas-shielded arc welding method of the present invention, the slag amount of preferred described leading electrode compares S
l, described rear row electrode slag amount compare S
t, and the slag amount of described filler wire compare S
fmeet the condition of formula (5).
[mathematical formulae 3]
0.05≤S
T+S
L+S
F≤0.3···(5)
According to such welding method, while reaching dark fusion penetration, molten bath is stablized, and weld bead shape is good, and resistance to gas porosity improves.
In multielectrode gas-shielded arc welding method of the present invention, preferred described leading electrode is solid core welding wire, and described rear row electrode is flux-cored wire, and described filler wire is solid core welding wire or flux-cored wire.
According to such welding method, use solid core welding wire by leading electrode, better dark fusion penetration can be obtained.In addition, use flux-cored wire by rear row electrode, filler wire uses solid core welding wire or flux-cored wire, and can maintain the stability in molten bath and the balance of dark fusion penetration, weld bead shape and resistance to pit improve.
Invention effect
According to multielectrode gas-shielded arc welding method of the present invention, the dark fusion penetration of weld metal can be made.In addition, according to multielectrode gas-shielded arc welding method of the present invention, splashing generating capacity, undercut can be suppressed, amalgamation, resistance to pit can be made to improve, weld bead shape, welding bead can be made to align good.
Accompanying drawing explanation
Fig. 1 is the schematic stereogram of the outline representing multielectrode gas-shielded arc welding device.
Fig. 2 is the schematic front view of the outline of the state of the soldered material represented when being welded by welding method of the present invention.
Fig. 3 is the schematic side view of the situation of the fusion penetration representing welding method of the present invention, represents side view when fusion penetration is shallow.
Fig. 4 is the schematic side view of the situation of the fusion penetration representing welding method of the present invention, is side view when representing that fusion penetration is dark.
Fig. 5 is the schematic front view of the state of the tip representing welding method of the present invention.
Fig. 6 is the schematic front view for illustration of welding torch angle.
Detailed description of the invention
Below, just for implementing the mode of multielectrode gas-shielded arc welding method of the present invention, be suitable for explaining with reference to accompanying drawing.
First, after an example of the multielectrode gas-shielded arc welding device for multielectrode gas-shielded arc welding method is described, then multielectrode gas-shielded arc welding method is described.
" multielectrode gas-shielded arc welding device "
As shown in Figure 1, 2; multielectrode gas-shielded arc welding device S is (following; be suitable for being called welder S), possess leading electrode 11 and rear row electrode 21, between leading electrode 11 and rear row electrode 21, also possess filler wire (i.e. target) 31 in addition.In addition, possess 3 sources of welding current, that is, the source of welding current L be connected with leading electrode 11, the source of welding current R be connected with rear row electrode 21, the source of welding current be connected with filler wire 31 (i.e. filling power supply) M.
Welder S is the contact with gas blocking weld and air, while use multiple electrode to carry out the device welded.
Further, welder S as shown in Figure 1, is preferably applicable to horizontal fillet welding.In detail, welder S, the lower plate 2 of edge as soldered material 1 and the corner part (i.e. weld) of riser 3, be configured with these 3 electrodes of leading electrode 11, rear row electrode 21 and filler wire 31 as one group, the direction of arrow along Fig. 1 moves while weld.Further, leading electrode 11, rear row electrode 21 and filler wire 31 are connected to distribution board 6 via wiring.
In addition, welder S also can be following structure, namely, can weld lower plate 2 and the mode of the corner part of the both sides of riser 3 simultaneously, press from both sides every riser 3 and make two groups of leading electrodes 11,11, rear row electrode 21,21, filler wire 31,31 configures relatively, and two arrays of electrodes moves simultaneously.In addition, also can be following formation, can weld the mode of lower plate 2 and multiple riser 3,3 simultaneously, relative to respective riser 3, configure two groups of leading electrodes 11,11, rear row electrode 21,21, filler wire 31,31, moves electrode more than two simultaneously.
Further, in welder S, gas is not particularly limited, uses and be used for the known gas of gas shielded arc welding, such as, the mist etc. of carbon dioxide, itself and inert gas.
Leading electrode 11 and rear row electrode 21, make electric arc occur in the front end of each electrode, formed (with reference to Fig. 2) making fusion pool (i.e. motlten metal) 8 as the lower plate 2 of soldered material 1 and the weld of riser 3.On the other hand, filler wire 31 is inserted in the molten bath 5 of fusion pool 8, prevents the generation of the magnetic interference of arc blow etc., makes this molten bath 5 stable (with reference to Fig. 2).
Further, the fusion pool 8 produced by leading electrode 11 and rear row electrode 21 is solidified, and becomes weld metal 7 thus, and this weld metal 7 welds lower plate 2 and riser 3.Then, welding slag 19 is formed at the surface of weld metal 7.
Leading electrode 11, rear row electrode 21 and filler wire 31 are preferably given speeds control and are fed into weld at certain speed.
The source of welding current L, R, M are the power supply supplying electric current to leading electrode 11, rear row electrode 21, filler wire 31 respectively.
In source of welding current L, at this, positive pole connects leading electrode 11, negative pole connects soldered material 1 (i.e. lower plate 2 or riser 3).In source of welding current R, at this, row electrode 21 after positive pole connects, negative pole connects soldered material 1 (i.e. lower plate 2 or riser 3).Further, in source of welding current M, negative pole connects filler wire 31, positive pole connects soldered material 1 (i.e. lower plate 2 or riser 3).
Further, in horizontal fillet welding, unless otherwise indicated, otherwise so-called fusion penetration is dark or shallow all refers to about horizontal direction, i.e. the fusion penetration of the thickness direction of riser 3.Such as, Fig. 3 represents that fusion penetration degree of depth a is little, the situation that namely fusion penetration of the horizontal direction of welding bead is shallow, and Fig. 4 represents that fusion penetration degree of depth a is large, the situation that namely fusion penetration of the horizontal direction of welding bead is dark.
" multielectrode gas-shielded arc welding method "
Then, multielectrode gas-shielded arc welding method of the present invention is described.Multielectrode gas-shielded arc welding method of the present invention, can use aforementioned multielectrode gas-shielded arc welding device S (with reference to Fig. 2) to carry out.
That is, multielectrode gas-shielded arc welding method, is that leading electrode and rear row electrode use gas shielded arc welding welding wire, filler wire is inserted the welding method of carrying out in the motlten metal between described leading electrode with described rear row electrode welding.
And multielectrode gas-shielded arc welding method is the anode-cathode distance between the leading electrode of regulation and rear row electrode; The weldingvoltage V of leading electrode
land the welding current I of leading electrode (V)
l(A); Weldingvoltage V
land welding current I (V)
l(A) relation; The gage of wire R of leading electrode
l(mm) and the welding wire of leading electrode give prominence to length E
l(mm) relation, in filler wire, the method that the electric current and carrying out of circulation positive polarity welds.
Below, each condition is described.
[anode-cathode distance between leading electrode and rear row electrode: 15 ~ 50mm]
In the present invention, the anode-cathode distance of leading electrode and rear row electrode must be 15 ~ 50mm.At this, as shown in Figure 5, so-called anode-cathode distance is the distance W of the level of the front end of the front end of the welding wire 11b of leading electrode 11 and the welding wire 21b of rear row electrode 21.When using DC power supply to weld, from arc blow and the point forming 1 fusion pool, the anode-cathode distance of leading electrode and rear row electrode becomes problem.When this anode-cathode distance is lower than 15mm, leading electrode, rear row electrode cause electric arc unstable jointly, and weld bead shape is deteriorated, in addition because electric arc interference causes splashing generation quantitative change many.On the other hand, if anode-cathode distance is higher than 50mm, then can not form 1 fusion pool by 2 electrodes, resistance to pit is deteriorated.Therefore, the anode-cathode distance of leading electrode and rear row electrode is 15 ~ 50mm.From making weld bead shape better, the viewpoint that splashing generating capacity is reduced further is set out, and anode-cathode distance is preferably more than 20mm.In addition, from the viewpoint improving resistance to pit further, below 45mm is preferably.
[the weldingvoltage V of leading electrode
l: 26 ~ 38V]
The weldingvoltage V of leading electrode
lduring lower than 26V, molten bath becomes stable, and weld bead shape is also deteriorated.In addition, the amalgamation welding beginning portion is also deteriorated.On the other hand, if the weldingvoltage V of leading electrode
lhigher than 38V, then can not maintain spray transfer and become the droplet transfer, a large amount of splashings occurs.In addition, also easily there is undercut.Therefore, the weldingvoltage V of leading electrode
lbe 26 ~ 38V.From making weld bead shape better, the better viewpoint of the amalgamation in welding beginning portion is set out, the weldingvoltage V of leading electrode
lbe preferably more than 28V.In addition, from reducing splashing generating capacity further, suppressing the viewpoint of the generation of undercut to be set out further, being preferably below 36V.
[the welding current I of leading electrode
l: 250 ~ 550A]
The welding current I of leading electrode
lduring lower than 250A, the arc force of leading electrode dies down, and fusion penetration also shoals.On the other hand, if the welding current I of leading electrode
lhigher than 550A, then the injection of electric arc becomes problem, and splashing, it is many that quantitative change occurs, and undercut easily occurs.Molten bath is also unstable in addition, and weld bead shape is also deteriorated.Therefore, the welding current I of leading electrode
lbe 250 ~ 550A.From the view point of deepening fusion penetration further, the welding current I of leading electrode
lbe preferably more than 270A.In addition, from reducing splashing generating capacity further, suppress the generation of undercut further, the viewpoint making weld bead shape better is set out, and is preferably below 500A.
In the present invention, weldingvoltage V
land welding current I (V)
l(A) condition of formula (1) is met, about leading electrode, gage of wire R
l(mm) and welding wire give prominence to length E
l(mm) condition of formula (2) is met.
Further, these formulas derive by experiment.
[mathematical formulae 4]
[56≤V
L·10
3/I
L≤100…(1)]
Find in the present invention, if weldingvoltage V
l(V) with welding current I
l(A) ratio is in the scope shown in formula (1), then both can guarantee dark fusion penetration, and can carry out low spatter welding again, molten bath is also stablized, and also undercut can not occur even if carry out welding with big current.That is, by meeting formula (1), can not under molten drop, but in the mode of the surrounding surrounding molten drop, electric arc be formed, even 100% carbon dioxide welding, be still spray transfer, can realize pole low spatter welding.
Next, for " the V shown in formula (1)
l10
3/ I
l" meaning of upper lower limit value of value is described.
, there is following such relation in each parameter and the characteristic of welding of formula (1).
(a1) weldingvoltage V
ltime too high, can not maintain spray transfer and become the droplet transfer, a large amount of splashings occurs.In addition, undercut also easily occurs.
(a2) welding current I
ltime too low, the arc force of leading electrode dies down, and fusion penetration also shoals.
Therefore, " V is made
l10
3/ I
l" value be in " 100 " below, can spray transfer be maintained and reduce splashing, and suppressing the generation of undercut, molten bath is stablized, good weld bead shape can be maintained, while realize dark fusion penetration.
In addition, between each parameter and the characteristic of welding of formula (1), there is following such relation.
(b1) weldingvoltage V
ltime too low, molten bath is unstable, and weld bead shape is also deteriorated.
(b2) welding current I
ltime too high, the arc force of leading electrode is excessively strong, and molten bath is unstable.
Therefore, " the V shown in formula (1) is made
l10
3/ I
l" value be more than " 56 ", molten bath can be made to stablize and maintain good weld bead shape, while realize dark fusion penetration.
That is, " V
l10
3/ I
l" value lower than 56 time, molten bath is unstable, and weld bead shape is also deteriorated.In addition, the arc force of leading electrode is excessively strong, and molten bath is unstable.On the other hand, if " V
l10
3/ I
l" value higher than 100, then can not maintain spray transfer and become the droplet transfer, a large amount of splashing occurs.In addition, undercut also easily occurs.In addition, the arc force of leading electrode dies down, and fusion penetration also shoals.Therefore, " V
l10
3/ I
l" value be 56 ~ 100.From making weld bead shape better, the viewpoint making molten bath more stable is set out, " V
l10
3/ I
l" value be preferably more than 60.In addition, from reducing splashing generating capacity further, suppress the generation of undercut further, the viewpoint making fusion penetration darker is set out, and is preferably less than 84, is more preferably less than 80.
[5≤E
L/R
L≤20…(2)]
In the present invention, gage of wire R
l(mm) and welding wire give prominence to length E
l(mm) making molten bath stabilisation, in order to reach darker fusion penetration, the condition of formula (2) be met.
So-called welding wire gives prominence to length E
l, as shown in Figure 5, be for supplying in tip (i.e. ignition tip) 11a of electric current to welding wire 11b, the part of finally giving prominence to as welding wire 11b from tip leading section to the length of the front end of welding wire 11b.
For gage of wire R
lwith outstanding length E
lto welding current I
lbe described with the impact that welding wire melting speed is brought.
Such as, welding current I
ltime identical, gage of wire R
lthicker, outstanding length E in addition
lshorter, welding wire melting speed is less, more favourable to dark fusion penetration.But, if gage of wire R
lcross thick, or outstanding length E
ltoo short, then welding current I
lexcessive, molten bath is unstable, and weld bead shape is also deteriorated.Therefore find, outstanding length E
lwith gage of wire R
lrelation meet the condition shown in formula (2), be make dark fusion penetrationization and form the necessary condition taken into account of stable molten bath.
" E
l/ R
l" value lower than 5 time, gage of wire R
lcross thick, or outstanding length E
ltoo short, therefore welding current I
lexcessive, molten bath is unstable, and weld bead shape is also deteriorated.On the other hand, if " E
l/ R
l" value higher than 20, then gage of wire R
lshort, outstanding length E
lalso elongated, therefore fusion penetration depth shallower.Welding bead alignment (namely descending leg straight ahead) also deterioration in addition.Therefore, " E
l/ R
l" value be 5 ~ 20.From making molten bath more stable, the viewpoint that weld bead shape is better is set out, " E
l/ R
l" value be preferably more than 7.In addition, from deepening fusion penetration further, the viewpoint that welding bead is alignd more well is set out, and is preferably less than 18.
[in filler wire, circulation positive polarity electric current and weld]
In order to the stabilisation in molten bath, filler wire must be inserted molten bath, be that the electric current supply of positive polarity (i.e. welding wire negative pole) is to filler wire by its polarity.If become antipolarity, then can not eliminate the impact of various interference essential factor (that is, the wide arc gap excessively in (a) fillet welding portion, the excessive coating film thickness of (b) shop primer, the Current Voltage variation etc. in (c) factory).Further, same lower than problem points during 15mm with anode-cathode distance, leading electrode, rear row electrode all cause electric arc unstable, and shape is deteriorated, and in addition, the problem that the many grades of quantitative change occur of splashing produces.Owing to splashing to the attachment of protection nozzle, the multiple of splashing causes protection bad, also becomes the reason that pore occurs.On the other hand, if the electric current of the positive polarity that circulates in filler wire, then can be formed not by the stable molten bath of various interference effect.Its mechanism may not be clear, but such as can as described in Japanese Unexamined Patent Publication 2008-55509 publication investigate.
In addition, in the present invention, following condition is preferably.
The deposition rate W of leading electrode
l(g/min), the deposition rate W of rear row electrode
tand the deposition rate W of filler wire (g/min)
f(g/min) condition of formula (3) and formula (4) is preferably met.
Further, these formulas are derived by experiment.
[mathematical formulae 5]
[0.5≤W
T/W
L≤1.0…(3)]
By making the ratio of the deposition rate of leading electrode and rear row electrode be suitable scope, can make dark fusion penetration and weld bead shape better.In the present invention, the condition of formula (3) is preferably met.
If " W
t/ W
l" value be more than 0.5, then the deposition amount of row electrode can not become very few afterwards, and the deposition amount of leading electrode can not become too much, and the good and molten bath stabilisation of balance, weld bead shape is better.In addition, the deposition amount of leading electrode can not become many terrifically, can obtain good dark fusion penetration.On the other hand, if " W
t/ W
l" value below 1.0, then the deposition amount of row electrode can not become many afterwards, and the deposition amount of leading electrode can not become very few, and the good and molten bath stabilisation of balance, weld bead shape is better.Therefore, " W
t/ W
l" value be preferably 0.5 ~ 1.0.
[0.02≤W
F/(W
L+W
T)≤0.3…(4)]
In the present invention, in order to make the stability in molten bath improve, the condition of formula (4) is preferably met.
If " W
f/ (W
l+ W
t) " value be more than 0.02, then the stablizing effect in molten bath becomes large, and weld bead shape is better.On the other hand, if " W
f/ (W
l+ W
t) " value below 0.3, then the deposited metal amount being equivalent to the filler wire butt welded seam pin of the deposited metal amount of leading electrode and rear row electrode long can not be too much, and weld bead shape is difficult to become convex.Therefore, " W
f/ (W
l+ W
t) " value be preferably 0.02 ~ 0.3.
Next, the definition of deposition rate and measuring method are described.
Deposition rate is the weld metal adhesion amount (i.e. deposition amount) in unit weld interval.Deposition amount can be tried to achieve by following mode.
(situation of flux-cored wire)
Measure the breadboard quality before welding, give prominence to welding wire the disk diffusion method that length 25mm, suitable welding current and arc voltage carry out 1 minute, measure removing slag, splash after breadboard quality.This welding fore-and-aft survey to the difference of breadboard quality be the deposition amount of every 1 minute, i.e. deposition rate.
(situation of solid core welding wire)
Deposition amount is substantially equal with welding wire melting quality, and the mean value measuring the Quality of Final Welding Wire of per unit length with N=5 is multiplied with the mean value that the welding wire measuring time per unit with N=5 gives length.
In addition, in the present invention, the slag amount of preferred leading electrode compares S
l, rear row electrode slag amount compare S
t, and the slag amount of filler wire compare S
fmeet the condition of formula (5).
Further, this formula is derived by experiment.
[mathematical formulae 6]
0.05≤S
T+S
L+S
F≤0.3···(5)
[0.05≤S
T+S
L+S
F≤0.3…(5)]
In order to both obtain dark fusion penetration, making again molten bath stabilisation and guaranteeing weld bead shape and resistance to gas porosity, preferably suitably controlling the slag amount ratio occurred.In the present invention, the condition of formula (5) is preferably met.
If " S
t+ S
l+ S
f" value be more than 0.05, then cover the slag on welding bead surface and be difficult to form spot, weld bead shape is better.On the other hand, if " S
t+ S
l+ S
f" value below 0.3, then slag amount can not be superfluous, and resistance to gas porosity improves further, and the amalgamation welding beginning portion also improves further.In addition, welding bead alignment (i.e. leftover bits and pieces linear advancement) also improves further.Therefore, " S
t+ S
l+ S
f" value be preferably 0.05 ~ 0.3.From the view point of making weld bead shape better, " S
t+ S
l+ S
f" value be more preferably more than 0.1.In addition, from the view point of making resistance to gas porosity, the amalgamation in welding beginning portion, welding bead align better, less than 0.25 is more preferably.
Then, the definition of slag amount ratio and measuring method are described.
Each slag amount is than being " (the welding wire melting quality of projects (welding wire melting quality-deposition amount-flue dust generating capacity-splashing generating capacity)/time per unit of time per unit) ".
But, owing to being difficult to directly to measure each slag amount ratio, so the slag amount ratio of formula (5), be to deduct the value of the quality of the welding thing eliminating slag than representing from the welding thing after welding.Specifically, the measured value obtained by following formula (A) is just.Further, because fume amount can be ignored, so be not included in following formula.
Further, in following formula (A), " (breadboard quality+deposition amount+splashing generating capacity+slag amount)=gross mass ".
[(breadboard quality+deposition amount+splashing generating capacity+slag amount)-(splashing amount of breadboard quality+deposition amount+remain in breadboard)]/(breadboard quality+deposition amount+splashing generating capacity+slag amount) ... (A)
Deposition amount measuring method: as above-mentioned.
Flue dust generating capacity: the flue dust generating capacity being the time per unit according to JISZ3940 measurement.Welding condition is identical with deposition amount measuring condition.
Splashing generating capacity: the splashing generating capacity being the time per unit measured by total amount method of trapping.Welding condition is identical with deposition amount measuring condition.
Total amount method of trapping is the method for collecting the splashing of dispersing from electric arc point by catch.That is, carry out downward disk diffusion method, collect with the catch made of copper being arranged at surrounding the splashing at this moment occurred, and measure quality, try to achieve the splashing generating capacity of time per unit or unit consumption welding material amount.
Slag amount can be adjusted by the condition such as the oxide amount in welding wire, deoxidant element etc., gas shield.
[other]
In multielectrode gas-shielded arc welding method, preferred leading electrode is solid core welding wire, and rear row electrode is flux-cored wire, and filler wire is solid core welding wire or flux-cored wire.Leading electrode uses solid core welding wire, can obtain better dark fusion penetration.In addition, rear row electrode uses flux-cored wire, and filler wire uses solid core welding wire or flux-cored wire, can maintain the stability in molten bath and the balance of dark fusion penetration, and weld bead shape and resistance to pit can be made to improve.
As flux-cored wire, the titanium dioxide flux-cored wire based on rutile or what is called are called that the flux-cored wire based on metal powder of metal system all can be suitable for.
Further, for flux-cored wire, compare the designed composition of common single electrode, be particularly preferably suitable for the composition of multi-electrode construction method.This is to form 1 fusion pool by the welding wire of leading electrode and rear this two side of row electrode.
The composition of flux-cored wire does not limit, but particularly preferred welding wire composition is, when titanium dioxide flux-cored wire, in welding wire gross mass, and oxide (TiO
2, SiO
2, MgO, Al
2o
3, FeO, Fe
2o
3, ZrO
2deng) be 1.5 ~ 5.5 quality %.If oxide is at more than 1.5 quality %, then the slag covering welding bead surface can not become spot, and weld bead shape is better.On the other hand, if oxide is at below 5.5 quality %, then slag amount can not be superfluous, and the mobility of slag diminishes, and therefore the alignment in welding bead end-blocking portion is better.Therefore, oxide is preferably 1.5 ~ 5.5 quality %.Further, the raw material of oxide can enumerate rutile, ilmenite, zircon sand, aluminium oxide, magnesia, silica sand etc.
For flux-cored wire, be preferably aggregated in welding wire gross mass containing alkali metal oxide (K
2o, Na
2o and Li
2o converts) 0.01 ~ 0.15 quality %.If these alkali metal oxides are more than 0.01 quality %, then the stability of electric arc improves further.On the other hand, if alkali metal oxide is below 0.15 quality %, then the blow of electric arc can not become too strong, and fusion pool is more stable.In addition, the easy moisture absorption of raw material of alkali metal oxide, the resistance to hygroscopicity of welding wire entirety easily improves.Therefore, alkali metal oxide preferably makes K
2o, Na
2o and Li
2one or more of O are the scope of 0.01 ~ 0.15 quality %.Further, as K
2o, Na
2o, Li
2the raw material of O, can enumerate feldspar, soda-lime glass, potash glass etc.Alkali metal oxide can apply various alkali metal oxide.
In addition, in flux-cored wire, preferably Mg, Si, Mn is added with objects such as deoxidiers.As the raw material of Mg, metal M g, Al-Mg, Si-Mg, Ni-Mg etc. can be enumerated.As the raw material of Si, Fe-Si, Fe-Si-Mn etc. can be enumerated.As the raw material of Mn, metal M n, Fe-Mn, Fe-Si-Mn etc. can be enumerated.
In addition, the composition contained by flux-cored wire is iron powder, fluoride, bismuth oxide etc.In metallic flux cored wire situation, particularly preferred welding wire composition is in welding wire gross mass, oxide (TiO
2, SiO
2, MgO, Al
2o
3, FeO, Fe
2o
3, ZrO
2deng) be below 1.5 quality %.That is, preferable alloy raw material in welding wire gross mass containing more than 98 quality %.In other words, be exactly preferred in solder flux, make raw metal in solder flux gross mass containing more than 94 quality %.Raw metal is the ferroalloy of iron powder or Fe-Mn and Fe-Si etc.As arc stabilizer, alkali metal oxide (K
2o, Na
2o and Li
2o converts) the various oxides same with TiO 2 series can be suitable for, be preferably aggregated in welding wire gross mass containing 0.01 ~ 0.15 quality %.If these alkali metal oxides are more than 0.01 quality %, then the stability of electric arc improves further.On the other hand, if alkali metal oxide is at below 0.15 quality %, then the blow of electric arc can not become too strong, and molten bath is more stable.In addition, the easy moisture absorption of raw material of alkali metal oxide, and the resistance to hygroscopicity of welding wire entirety easily improves.Therefore, for alkali metal oxide, preferably make K
2o, Na
2o and Li
2one or more of O are the scope of 0.01 ~ 0.15 quality %.Further, as K
2o, Na
2o, Li
2the raw material of O, can enumerate feldspar, soda-lime glass, potash glass etc.In addition, Mg, Si, Mn are added equally.
Composition about solid core welding wire does not also limit, but as an example, containing C:0.03 ~ 0.15 quality %, Si:0.10 ~ 1.00 quality, Mn:0.50 ~ 2.50 quality %, below P:0.030 quality %, S:0.030 below quality %, below Cu:0.35 quality %, Ti:0.25 below quality %, surplus is Fe and inevitable impurity.In addition, also Ni, Cr, Al, Zr, Mg etc. can be contained.Further, Cu is plating composition.
Be mentioned component by solid core welding wire, be more suitable for dark deeply molten.
Leading electrode and the preferred antipolarity of rear row electrode and the DC current of supply constant voltage characteristic or droop characteristic.Thus, the stability in molten bath improves, and weld bead shape, resistance to pit are good, and dark fusion penetrationization improves.
Also have, so-called constant voltage characteristic, the speed of giving controlling the sacrificial electrode be fed under certain speed exactly causes the speed of giving to change because of some interference, even if when arc voltage changes, also current value automatically can be made to increase and decrease in the mode controlled as fixing voltage, continue to carry out the characteristic that stable arc welding is controlled like this.In addition, so-called droop characteristic, the power output being exactly the source of welding current is the characteristic that sinusoidal wave shape changes.In droop characteristic, the change because of arc length can cause voltage that suitable change occurs, but electric current only slightly changes.In droop characteristic, even if cause voltage change because of the variation etc. of arc length, also can circulate constant electric current substantially.
[embodiment]
Below, for embodiments of the invention, and depart from the scope of the present invention comparative example and contrasted and illustrate.
Use the welding wire that the one-tenth shown in following table 1 is grouped into, carry out soldering test by the condition shown in following condition and table 2.Further, about flux-cored wire, the solder flux be grouped into by the one-tenth shown in following table 1 is filled in soft steel shell with the solder flux rate shown in table 1 and manufactures.Further, in Table 1, representing with "-" not containing solder flux, in table 2, what do not meet scope of the present invention is draw underscore to represent at numerical value.
[table 1]
[soldering test condition]
(1) use forms T-shaped fillet welding joint for examination steel plate and joint geometry: 12mm × 100mm × 1000mm steel plate.Further, priming paint thickness 40 μm.
(2) posture is welded: bipolar electrode horizontal fillet welding
(3) protective gas: 100%CO
2, flow 25 liters/min
(4) power supply characteristic: DC welding wire (+)
(5) row electrode afterwards: 300 ~ 500A × 30 ~ 40V, filler wire: 50 ~ 120A
(6) advancing angle β receding angle α: leading electrode; Receding angle α 10 °, rear row electrode; Advancing angle β 10 °, filler wire; Advancing angle β 0 °, receding angle α 0 °
The angle that so-called advancing angle β receding angle α as shown in Figure 5, is the line vertical relative to the surface of lower plate 2, form with the axis the tip leading section of the part of finally giving prominence to from tip 11a, 21a, 31a as welding wire 11b, 21b, 31b.
(7) welding torch angle θ: leading electrode; 50 °, rear row electrode; 50 °, filler wire; 50 °
So-called welding torch angle θ, as shown in Figure 6, when leading electrode 11, is the angle that the surface of the lower plate 2 of horizontal arrangement and leading electrode 11 are formed.In rear row electrode, filler wire too.
(8) target location: leading electrode; 0mm, rear row electrode; 2mm (lower plate side), filler wire; 5mm (upper plate side)
(9) speed of welding: 2.0m/ minute
(10) filler wire diameter: 1.2mm
(11) gap of angle welding root: 2.0mm
Further, the measuring method of deposition rate and slag amount ratio is as aforementioned.Slag amount is than being tried to achieve by previously described formula (A).
[table 2]
[evaluation criterion]
In this soldering test, carry out following evaluation.
(dark fusion penetration)
The fusion penetration degree of depth of the horizontal direction according to a in Fig. 3,4 is evaluated.
Evaluation criterion is as follows.
4 points: more than 3.0mm
3 points: more than 2.5mm and lower than 3.0mm
2 points: more than 2.0mm and lower than 2.5mm
1 point: lower than 2.0mm
(amalgamation)
Observe the welding bead carried out with above-mentioned welding condition, evaluated by sense organ.
Evaluation criterion is as follows.
4 points: very excellent
3 points: excellent
2 points: good
1 point: bad
(splashing generating capacity)
The splashing amount occurred is measured by aforesaid total amount method of trapping.
Evaluation criterion is as follows.
4 points: 0.7 (g/ minute) below
3 points: higher than 0.7 (g/ minute) and 1.3 (g/ minute) below
2 points: higher than 1.3 (g/ minute) and 2.0 (g/ minute) below
1 point: higher than 2.0 (g/ minute)
(weld bead shape)
Observe the welding bead carried out with above-mentioned welding condition, evaluated by sense organ.
Evaluation criterion is as follows.
4 points: very excellent
3 points: excellent
2 points: good
1 point: bad
(resistance to pit)
Statistics pit generation number (individual/1000mm).
Evaluation criterion is as follows.
4 points: 0
3 points: 1 ~ 2
2 points: 3 ~ 5
More than 1 point: 6
(undercut)
In 200mm, 600mm, 800mm position of the longitudinally of breadboard perpendicular to the cutting of width direction, observe this section and confirm undercut.
Evaluation criterion is as follows.Further, following evaluation criterion is at least for a place.
4 points: nothing
3 points: below 0.2mm
2 points: higher than 0.2mm and below 0.5mm
1 point: higher than 0.5mm
(welding bead alignment (the long property of leftover bits and pieces pin))
Observe the welding bead carried out with above-mentioned welding condition, evaluated by sense organ.
Evaluation criterion is as follows.
4 points: very excellent
3 points: excellent
2 points: good
1 point: bad
In above assessment item, more than 2 points is qualified.These results are presented in following table 3.
[table 3]
As Table 2,3, meet No.1 ~ 29 of scope of the present invention, whole assessment items is good.
On the other hand, No.30 ~ 38 not meeting scope of the present invention are following result.
No.30 is because anode-cathode distance is lower than lower limit, so the evaluation of splashing generating capacity, weld bead shape is bad.
No.31 is because anode-cathode distance is higher than higher limit, so the evaluation of resistance to pit is bad.
No.32 is because the polarity of filler wire is antipolarity, so splashing generating capacity, the evaluation of weld bead shape is bad.
No.33 is because the electric current of leading electrode is lower than lower limit, and the value of formula (1) is higher than higher limit, so the evaluation of dark fusion penetration, splashing generating capacity, undercut is bad.
No.34 is because the electric current of leading electrode is higher than higher limit, and the value of formula (1) is lower than lower limit, so the evaluation of splashing generating capacity, weld bead shape, undercut is bad.
No.35 is because the voltage of leading electrode is lower than lower limit, so the evaluation of amalgamation, weld bead shape is bad.
No.36 is because the voltage of leading electrode is higher than higher limit, so the evaluation of splashing generating capacity, undercut is bad.
No.37 is because the value of formula (2) is higher than higher limit, so the evaluation of dark fusion penetration, welding bead alignment is bad.
No.38 is because the value of formula (2) is lower than lower limit, so the evaluation of weld bead shape is bad.
Above, show the mode and embodiment implemented, be illustrated in detail for the present invention, but purport of the present invention does not limit by described content, its interest field must based on extensive interpretation described in the scope of art solutions.Further, content of the present invention extensively can certainly change based on foregoing description, change etc.
Symbol description
1 soldered material
2 lower plates (soldered material)
3 risers (soldered material)
5 molten baths
6 distribution boards
7 weld metals
8 fusion pool (motlten metal)
11 leading electrodes
11a, 21a, 31a tip
11b, 21b, 31b welding wire
19 welding slags
Row electrode after 21
31 filler wires
Claims (6)
1. a multielectrode gas-shielded arc welding method; it is characterized in that; that leading electrode and rear row electrode use gas shielded arc welding welding wire; filler wire is inserted the multielectrode gas-shielded arc welding method carrying out in the motlten metal between described leading electrode and described rear row electrode welding
Anode-cathode distance between described leading electrode and described rear row electrode is 15 ~ 50mm,
The weldingvoltage V of described leading electrode
lbe 26 ~ 38V, the welding current I of described leading electrode
lbe 250 ~ 550A, weldingvoltage V
lunit be V, welding current I
lunit be A,
Described weldingvoltage V
l, and described welding current I
lmeet the condition of formula (1), about described leading electrode, gage of wire R
llength E is given prominence to welding wire
lmeet the condition of formula (2), gage of wire R
llength E is given prominence to welding wire
lunit be mm,
In described filler wire, circulation positive polarity electric current and weld,
2. multielectrode gas-shielded arc welding method according to claim 1, is characterized in that, the deposition rate W of described leading electrode
l, described rear row electrode deposition rate W
twith the deposition rate W of described filler wire
fmeet the condition of formula (3) and formula (4), the deposition rate W of leading electrode
l, rear row electrode deposition rate W
twith the deposition rate W of filler wire
funit be g/min,
3. according to multielectrode gas-shielded arc welding method according to claim 1 or claim 2, it is characterized in that, the slag amount of described leading electrode compares S
l, described rear row electrode slag amount compare S
ts is compared with the slag amount of described filler wire
fmeet the condition of formula (5),
0.05≤S
T+S
L+S
F≤0.3···(5)。
4. multielectrode gas-shielded arc welding method according to claim 1, is characterized in that, described leading electrode is solid core welding wire, and described rear row electrode is flux-cored wire, and described filler wire is solid core welding wire or flux-cored wire.
5. multielectrode gas-shielded arc welding method according to claim 2, is characterized in that, described leading electrode is solid core welding wire, and described rear row electrode is flux-cored wire, and described filler wire is solid core welding wire or flux-cored wire.
6. multielectrode gas-shielded arc welding method according to claim 3, is characterized in that, described leading electrode is solid core welding wire, and described rear row electrode is flux-cored wire, and described filler wire is solid core welding wire or flux-cored wire.
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| JP2014174404A JP6282199B2 (en) | 2014-08-28 | 2014-08-28 | Multi-electrode gas shielded arc welding method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108463311A (en) * | 2016-03-25 | 2018-08-28 | 株式会社神户制钢所 | Flux-cored wire for gas-shielded arc welding |
| CN109226938A (en) * | 2017-07-10 | 2019-01-18 | 株式会社神户制钢所 | Multielectrode gas-shielded electric arc single side soldering method |
| CN110662622A (en) * | 2017-06-19 | 2020-01-07 | 株式会社神户制钢所 | Multi-electrode submerged arc welding method and welding device |
| 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 |
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|---|---|---|---|---|
| JP6777609B2 (en) * | 2017-09-11 | 2020-10-28 | 株式会社神戸製鋼所 | Multi-electrode gas shield arc welding method |
| CN114769923B (en) * | 2022-04-20 | 2023-06-09 | 中国三峡建工(集团)有限公司 | Welding method of cantilever structure with rib plates |
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| CN108463311A (en) * | 2016-03-25 | 2018-08-28 | 株式会社神户制钢所 | Flux-cored wire for gas-shielded arc welding |
| CN110662622A (en) * | 2017-06-19 | 2020-01-07 | 株式会社神户制钢所 | Multi-electrode submerged arc welding method and welding device |
| CN109226938A (en) * | 2017-07-10 | 2019-01-18 | 株式会社神户制钢所 | Multielectrode gas-shielded electric arc single side soldering method |
| 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
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|---|---|
| KR20160026785A (en) | 2016-03-09 |
| KR101707324B1 (en) | 2017-02-15 |
| CN105382383B (en) | 2018-10-16 |
| JP6282199B2 (en) | 2018-02-21 |
| JP2016049537A (en) | 2016-04-11 |
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