CN105598596B - A kind of 1200MPa high strength steels preheating-free combined welding method - Google Patents
A kind of 1200MPa high strength steels preheating-free combined welding method Download PDFInfo
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- CN105598596B CN105598596B CN201610066161.XA CN201610066161A CN105598596B CN 105598596 B CN105598596 B CN 105598596B CN 201610066161 A CN201610066161 A CN 201610066161A CN 105598596 B CN105598596 B CN 105598596B
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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Abstract
The present invention provides a kind of tensile strength 1200MPa high strength steel preheating-free combined welding methods, including：Retaining wall on slope, pretreatment；Backing welding is carried out using gas shielded arc welding, welding wire is 500MPa welding wires；Welding is filled using the carbon dioxide gas arc welding of mechanical automation filler wire, welding wire is 980MPa high-strength steel welding wires；Carbon arc air gouging back chipping；Capping layer and envelope backing weld are carried out using mechanical automation silk filling non-melting electrode argon arc welding, welding wire is 560MPa high-strength steel welding wires.This combined welding method can reduce welding crack sensibility, and bead contour is attractive in appearance and welding joint mechanical property is good.The assembled welding process step of this mechanical automation is simple and convenient to operate, and can reduce production cost, improves production efficiency, practical, there is good popularizing application prospect.
Description
Technical field
The present invention relates to a kind of welding method of high strength steel, particularly tensile strength 1200MPa high strength steels not to preheat
Combined welding method, belong to welding technology field.
Background technology
Tensile strength 1200MPa high strength steel is increasingly taken seriously with the intensity of its superelevation, good plasticity and toughness etc.,
The demand for development of construction machinery production field " high-end, high-tech, high added value " can be met.Welding technique is to influence high strength steel
Using an important factor for, the innovation of welding method, welding material and technique should to the engineering of tensile strength 1200MPa high strength steels
With there is vital effect.
1200MPa high strength steel hardenabilitys are big, have stronger cold crack tendency, easily occur cold crack and fragility in welding
It is the defects of fracture, higher to welding procedure, quality and welding joint structure and performance requirement.The intensity of welding point should be ensured
The cool attenuation of welding point is reduced again and keeps good plasticity and toughness.Current domestic external welding 1200MPa high intensity
The conventional method of steel is SMAW, gas shielded arc welding, and the selection of welding material is mostly low strong or waits strong matching welding material,
But preheating is required before weldering, and postwelding requires to carry out post weld heat treatment.But the Welder of weld preheating and post weld heat treatment
Skill is more complicated, and production cost is high, and especially for large-scale welding engineering structural member, weld preheating is added with post weld heat treatment and applied
Work difficulty and production cost, and due to being influenceed by welding structure, preheating and post weld heat treatment sometimes is difficult to.
Chinese invention patent ZL200910019599.2 and CN103862184A propose that 900MPa and 1000MPa are high-strength respectively
The not preheated weld technique of steel is spent, the not preheated weld of 900MPa and 1000MPa high strength steels can be realized respectively.Intensity is got over
Height, welding difficulty is bigger, if can not preheat, under the conditions of not post weld heat treatment, realizes to tensile strength 1200MPa high strength steels
Welding, to simplify welding procedure, improve welder's working condition and reduce welding production cost will be significant.
The content of the invention
The purpose of the present invention is the deficiency for the existing welding technique of tensile strength 1200MPa high strength steels, is proposed a kind of
1200MPa preheating-free combined welding methods.
Design, manufacturing process, crack sensitivity and the brittle fracture of the strength matching butt joint of high-strength steel welded joint
Behavior has a major impact.The present invention is directed to the randomness of weld seam and mother metal tensile strength and is mutually combined between them random
Property, by the feature to strength matching coefficient and distribution experimental study, with reference to tensile strength 1200MPa high strength steels
The defects of fracture toughness, material internal size and welding point strength matching mode three between interaction relationship,
Propose it is a kind of for 1200MPa high strength steels it is welded do not preheat, the Combination Welding side without post weld heat treatment
Method.Welding crack sensibility can be reduced in this way, bead contour is attractive in appearance and welding joint mechanical property is good.It is this
The assembled welding process that method is used for mechanical automation can reduce production cost, improve production efficiency, practical, have very well
Popularizing application prospect.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of 1200MPa high strength steels preheating-free combined welding method, including：
Retaining wall on slope, pretreatment；
Backing welding is carried out using carbon dioxide gas arc welding, welding wire is 500MPa welding wires；
Welding is filled using the carbon dioxide gas arc welding of mechanical automation filler wire, welding wire is that 980MPa is high
Strong steel welding wire；
Carbon arc air gouging clears up root of weld；
Capping layer and envelope backing weld are carried out using mechanical automation silk filling non-melting electrode argon arc welding, welding wire is that 560MPa is high
Strong steel welding wire.
The present invention technical characterstic be：Backing welding is protected using the carbon dioxide of filling " low strong matching " 500MPa welding wires
Shield weldering；Packed layer fills the carbon dioxide gas arc welding of 980MPa high-strength steel welding wires using mechanical automation, and multiple tracks multilayer is filled out
Fill weldering；Capping layer and back cover layer welding bead fill 560MPa high-strength steel welding wires using mechanical automation silk filling non-melting electrode argon arc welding.
Heat input is strictly controlled in welding process, it is 100~150 DEG C to control interlayer temperature, and 1200MPa high strength steels are realized not with this
Preheat Combination Welding.
Preferably, welded using multiple tracks multilayer, it is 100~150 DEG C to control interlayer temperature.
Preferably, in the filling welding process, welding condition is as follows：Gage of wire 1.2mm, arc voltage 26
~30V, welding current are 320~380A, and thermal weld stress is controlled in 10~22kJ/cm, and shield gas flow rate is 15~25L/
min。
Preferably, in backing welding welding process, welding parameter is gage of wire 1.2mm, and arc voltage is 26~30V, weldering
It is 240~320A to connect electric current, and thermal weld stress is controlled in 15~25kJ/cm, protective gas 100%CO2, shield gas flow rate
For 15~20L/min.Existing bottom argon arc welding welding efficiency is low, and cost is higher.Further to reduce welding cost, the present invention
Backing welding is welded using the specialized for carbon dioxide gas protection of low strong matching welding wire, equipment is simple, can improve welding production efficiency, reduces welding
Cost.And carbon dioxide can be generated refractory compound with the diffusible hydrogen in weld seam and molten bath is discharged in the form of slag, so
This method can reduce the diffusible hydrogen content of welding point, be a kind of ultralow-hydrogen low welding method, be advantageous to improve crack resistance, fit
Together in the welding of high strength steel.
Preferably, in cosmetic welding welding process, welding parameter is gage of wire 2.0mm, and arc voltage is 26~30V, weldering
It is 240~280A to connect electric current, and control speed of welding is advisable so that welding bead surfacing is bright and clean；Protective gas is 100%Ar, protects gas
Body flow is 15~25L/min.
Preferably, in back welding welding process, welding parameter is gage of wire 2.0mm, and arc voltage is 26~30V, weldering
It is 240~300A to connect electric current, and control speed of welding is advisable so that welding bead surfacing is bright and clean.Protective gas is 100%Ar (argon gas),
Shield gas flow rate is 15~22L/min.
Preferably, a diameter of 1.2mm of the 500MPa levels gas shield welding wire, its deposited metal composition is with quality hundred
Ratio is divided to be calculated as：C 0.02~0.15%, Si 0.55~1.10%, Mn 1.40~1.90%, P≤0.030%, S≤
0.030%；Deposited metal mechanical property is：Tensile strength sigmab490~670MPa, yield strength σ s >=400MPa, elongation δ
>=18%, 0 DEG C of V-notch impact absorbing energy AKV≥47J；1200MPa high strength steel weldabilities are poor, easily in welding point root and
Occur welding cold cracking at fusion area, welded using bottoming and coordinate the low matching welding wires of 500MPa to improve root of weld toughness
(reducing weld strength, improve joint plasticity and toughness), reduces welding point constraint stress, reduces welding cold crack sensitivity, improve
Welding point comprehensive mechanical property.
Preferably, a diameter of 1.2mm of the 980MPa high-strength steel gas shield welding wire, its deposited metal composition is with matter
Measuring percentages is：C 0.1%, Si 0.80%, Mn 1.80%, Cr 0.35%, Ni 2.25%, Mo 0.60%；Deposition gold
Belonging to mechanical property is：Tensile strength sigmab>=900MPa, yield strength σs>=840MPa, elongation δ 16~19%, at room temperature V-arrangement lack
Mouth impact absorbing energy AKV70~85J；
Preferably, a diameter of 2.0mm of the 560MPa high-strength steel gas shield welding wire, its deposited metal composition is with matter
Measuring percentages is：C 0.08%, Si 0.85%, Mn 1.50%；Deposited metal mechanical property is：Tensile strength sigmab≥
560MPa, yield strength σ s >=450MPa, elongation δ 25~30%, at room temperature V-notch impact absorbing energy AKV130~
180J。
Preferably, during the gas shielded arc welding, protective gas is the carbon dioxide that purity is 99.9%.
Preferably, in the cosmetic welding welding process, protective gas is purity 99.9%Ar inert gas.
1200MPa high strength steels proposed by the present invention do not preheat, without post weld heat treatment assembled welding process tool
Body step is as follows：
(1) V-butt is opened in joint to be welded, bevel angle is 45 ° to 60 °, 2~3mm of root face；
(2) greasy dirt on its surface is removed using 20~30mm of hand operated grinding wheel piece polishing cleaning groove and groove both sides surface
With iron rust, it is set to expose metallic luster, groove and surface after cleaning polishing with absolute ethyl alcohol or acetone.
(3) backing welding is carried out using carbon dioxide gas arc welding, uses " low strong matching " 500MPa gas shield welding wires, mesh
Be using this welding wire low-intensity high tenacity improve weld metal crack resistance.Welding parameter is：Gage of wire 1.2mm, electricity
Arc voltage is 26~30V, and welding current is 240~320A, and thermal weld stress control is in 15~25kJ/cm, protective gas
100%CO2, shield gas flow rate is 15~20L/min.
(4) in order to improve weld seam bulk strength and production efficiency, CO is coordinated with 980MPa high-strength steel gas shield welding wire2Gas
Protect weldering and carry out mechanical automation filling welding, welded using multiple tracks multilayer, control interlayer temperature is at 100 DEG C~150 DEG C.Control weldering
Connecing parameter is：Gage of wire 1.2mm, arc voltage are 26~30V, and welding current is 320~380A, and thermal weld stress control exists
10~22kJ/cm, shield gas flow rate are 15~25L/min；
(5) root of weld is cleared up with carbon arc air gouging, and back of weld is polished flat with hand operated grinding wheel piece.
(6) in order to obtain good appearance of weld, non-melt pole argon is coordinated with 560MPa high-strength steel gas shield welding wire
Arc-welding carries out mechanical automation cosmetic welding welding, and welding parameter is：Gage of wire 2.0mm, arc voltage are 26~30V, welding
Electric current is 240~300A, and control speed of welding is advisable so that welding bead surfacing is bright and clean.Protective gas is 100%Ar (argon gas), is protected
Shield gas flow is 15~25L/min.
(7) mechanical automation back cover welding is carried out to back of weld using the non-melting electrode argon arc welding that fills silk, fills 560MPa
High-strength steel gas shield welding wire.Welding parameter is：Gage of wire 2.0mm, arc voltage are 26~30V, welding current is 240~
280A, control speed of welding are advisable so that welding bead surfacing is bright and clean.Protective gas is 100%Ar (argon gas), shield gas flow rate
For 15~22L/min.
In above-mentioned 1200MPa high-strength steel preheating-free combined welding methods, do not preheated before being welded in whole welding process, postwelding
Without post weld heat treatment.Need to keep continuous multiple tracks multilayer to weld in welding process, must not be interrupted in welding process, multiple tracks is more
Need to keep 100 DEG C~150 DEG C of interlayer temperature in layer mechanical automation welding process.
Wherein：Step (3) the 500MPa levels gas shield welding wire (South Korea's ZO-26 welding wires) preferably a diameter of 1.2mm, it is molten
Metallisation chemical composition is by percentage to the quality：C 0.02~0.15%, Si 0.55~1.10%, Mn 1.40~
1.90%, P≤0.030%, S≤0.030%；Deposited metal mechanical property is：Tensile strength sigmab490~670MPa, surrender are strong
Spend σ s >=400MPa, elongation δ >=18%, 0 DEG C of V-notch impact absorbing energy AKV≥47J。
Wherein：Step (3) the carbon dioxide purity is 99.9%.
Wherein：Step (4) the 980MPa high-strength steel gas shield welding wire (German UnionX90 welding wires) is preferably a diameter of
1.2mm, its deposited metal composition are by percentage to the quality：C 0.1%, Si 0.80%, Mn 1.80%, Cr
0.35%, Ni 2.25%, Mo 0.60%；Deposited metal mechanical property is：Tensile strength sigmab>=900MPa, yield strength σs≥
840MPa, elongation δ 16~19%, at room temperature V-notch impact absorbing energy AKV70~85J.
Wherein：Step (4) the carbon dioxide purity is 99.9%.
Wherein：Step (6) the 560MPa high-strength steel gas shield welding wire (German Union I52 welding wires) is preferably a diameter of
2.0mm, its deposited metal composition are by percentage to the quality：C 0.08%, Si 0.85%, Mn 1.50%；Deposition gold
Belonging to mechanical property is：Tensile strength sigmab>=560MPa, yield strength σ s >=450MPa, elongation δ 25~30%, at room temperature V-arrangement
Notch shock absorbs work(AKV130~180J.
Wherein：The inert gas (argon gas) that protective gas described in step (6) and step (7) is purity 99.9%Ar.
Present invention also offers 1200MPa high strength steel welding points prepared by any of the above-described method, the welding point
In, the room temperature tensile intensity of weld metal is more than 750MPa, the V-notch impact test of weld metal under -40 DEG C of test temperatures
Impact absorbing energy be more than 47J.
This 1200MPa high strength steels proposed by the present invention do not preheat, the mechanical automation without post weld heat treatment
Welding is combined, the bright and clean and attractive in appearance welding point of surfacing can be obtained, weld structure is with tiny needle-like iron element
Based on body, the germinating and extension of welding cold cracking can be effectively resisted.Welding heat affected zone is mainly by the low-carbon of thin lath-shaped
Martensite forms, and intensity and toughness are good.Effectively avoid heat affected area temper softening phenomenon.Obtained using this method
The tensile strength of the high-strength steel welded joints of 1200MPa is 700~900MPa, the V-notch impact absorbing energy of weld metal at 0 DEG C
More than 47J, its requirement can be met.
Using it is of the present invention do not preheat, without post weld heat treatment mechanical automation combination Welding welding tension it is strong
1200MPa high strength steels are spent, can obtain smooth welding point, the defects of flawless, stomata；The room temperature of weld metal
Tensile strength is more than 750MPa, and the impact absorbing energy of the V-notch impact test of weld metal is more than under -40 DEG C of test temperatures
47J, meet the performance requirement of high strength steel welding structural element.
Technical key point is embodied in：The specialized for carbon dioxide gas protection weldering of filling " low strong matching " 500MPa high-strength steel welding wires
For backing run；Multiple tracks multilayer filling weld seam is that the specialized for carbon dioxide gas protection using 980MPa high-strength steel welding wire as deposited metal welds；Lid
Surface layer and the non-melting electrode argon arc welding that backing run is filling 560MPa high-strength steel welding wires.Heat input and layer are controlled in welding process
Between 100~150 DEG C of temperature.The method have the characteristics that " low strong matching " backing run makes weld seam bottom form the good pin of toughness
Columnar ferrite tissue, improves the toughness of weld seam bottom, and weld seam ultralow-hydrogen low advantageously reduces crack sensitivity；Packed layer uses " etc.
Strong matching " welding wire machinery automatic welding improves production efficiency, improves weld strength and toughness；Using the silk filling of mechanical automation
Non-melting electrode argon arc welding capping can ensure that appearance of weld is smooth bright and clean with backing run.
It is proposed by the present invention not preheat, combine Welding without the 1200MPa high-strength steel of post weld heat treatment, it can reduce
Welding crack sensibility, bead contour is attractive in appearance and welding joint mechanical property is good.The Combination Welding work of this mechanical automation
Skill can reduce production cost, improve production efficiency, practical, there is good popularizing application prospect.
Brief description of the drawings
Fig. 1 butt welded joint schematic diagrames；Wherein, 1 backing run, 2 filler pass, 3 final pass, 4 backing runs.
Fig. 2 corner connection welding point schematic diagrames；Wherein, 1 backing run, 2 filler pass, 3 final pass, 4 backing runs.
Embodiment
Embodiment 1
Thickness is 16mm 1200MPa high-strength wearable steel butt welding.Filling 500MPa is respectively adopted in prime coat and packed layer
With the carbon dioxide gas arc welding of 980MPa high-strength steel welding wires, capping layer and back cover layer are using filling 560MPa high-strength steel welding wires
Silk filling non-melting electrode argon arc welding.From the good contravariant welding equipment of dynamic characteristic, test piece for welding joint uses Milling Machine
Processing method opens V-butt, and bevel angle is 50 °, root face 2mm.Using hand operated grinding wheel machine polishing groove face and welding point
Corrosion and greasy dirt in the range of the 20mm of both sides etc., are allowed to expose metallic luster.
(1) welded using carbon dioxide gas arc welding as backing welding, welding material from 500MPa high-strength steel gas shield welding
Silk (South Korea's ZO-26 welding wires), deposited metal composition is (wt.%) by percentage to the quality：C 0.08%, Si 0.65%,
Mn 1.60%, P≤0.030%, S≤0.030%；Deposited metal mechanical property is：Tensile strength sigmab490~670MPa, bend
Take intensity σ s >=400MPa, elongation δ >=18%, 0 DEG C of V-notch impact absorbing energy AKV≥47J.Using 100%CO2Gas
Protection, welding parameter are：Gage of wire is 1.2mm, stem elongation degree 30mm, arc voltage 28V, welding current 240A, sweating heat
Input as 12.5kJ/cm, shield gas flow rate 16L/min.
(2) using specialized for carbon dioxide gas protection weldering filling weldering, welding material is from 980MPa level high-strength steel gas shield welding wire (Germany
UnionX90 welding wires), its deposited metal composition is (wt.%) by percentage to the quality：C 0.1%, Si 0.80%, Mn
1.80%, Cr 0.35%, Ni 2.25%, Mo 0.60%；Deposited metal mechanical property is：Tensile strength sigmab>=900MPa, bend
Intensity σ s >=840MPa, elongation δ 16~19% are taken, at room temperature V-notch impact absorbing energy AKV70~85J.Using 100%
CO2Gas shield, welding parameter are：Gage of wire 1.2mm, stem elongation degree 30mm, arc voltage 28V, welding current 280A, weldering
It is 16kJ/cm to connect heat input, shield gas flow rate 15L/min, 150 DEG C of interlayer temperature.
(3) root of weld is cleared up with carbon arc air gouging, and back of weld is polished flat with hand operated grinding wheel piece.
(4) 560MPa level high-strength steel gas shield welding wires are selected using the non-melting electrode argon arc welding cosmetic welding that fills silk, welding material
(German UnionI52 welding wires), its deposited metal composition are (wt.%) by percentage to the quality：C 0.08%, Si
0.85%, Mn 1.50%；Deposited metal mechanical property is：Tensile strength sigmab>=560MPa, yield strength σ s >=450MPa, stretches
Long rate δ 25~30%, at room temperature V-notch impact absorbing energy AKV130~180J.100%CO2Gas shield, welding parameter
For：Gage of wire 2mm, stem elongation degree 30mm, arc voltage 29V, welding current 240A, thermal weld stress 16kJ/cm, protect gas
Body flow 20L/min.
(5) after welding finishes test plate (panel) front, test plate (panel) is overturn, back cover welding is carried out to its back side.It is 130 to control its temperature
DEG C, reuse the non-melting electrode argon arc welding that fills silk and carry out back cover welding.Welding wire is from identical with (4) with welding condition.
Postwelding welding point flat appearance is attractive in appearance, no face crack and root crack.The mechanical property of the welding point of acquisition
Can be：Tensile strength is 780MPa, elongation 13%, and V-notch impact absorbing energy is more than 47J and (is respectively at a temperature of -40 DEG C
68J, 76J, 89J), performance requirement can be met.
Embodiment 2
Thickness be 14mm 1200MPa high-strength wearable steel, the fillet welding joint form of box-structure.Prime coat and packed layer
The carbon dioxide gas arc welding of filling 500MPa and 980MPa high-strength steel welding wires is respectively adopted, capping layer and back cover layer, which use, to be filled out
Fill the silk filling non-melting electrode argon arc welding of 560MPa high-strength steel welding wires.From the good plasma cutting inverter of dynamic characteristic, to diagonal joint
Test piece for welding joint is opened using machine-tooled method cuts 45 ° of chamferings, a length of 2mm of bevel edge.Using hand operated grinding wheel machine and wire brush
The corrosion cleared up in the range of groove level welding point both sides 20mm and greasy dirt etc., expose metallic luster.
(1) backing welding is used as using specialized for carbon dioxide gas protection weldering, welding material selects 500MPa high-strength steel gas shield welding wire (Korea Spro
State's ZO-26 welding wires), deposited metal composition is (wt.%) by percentage to the quality：C 0.08%, Si 0.68%, Mn
1.59%, P≤0.030%, S≤0.030%；Deposited metal mechanical property is：Tensile strength sigmab490~670MPa, surrender are strong
Spend σ s >=400MPa, elongation δ >=18%, 0 DEG C of V-notch impact absorbing energy AKV≥47J.Using 100%CO2Gas is protected
Shield, welding parameter are：Gage of wire is 1.2mm, stem elongation degree 30mm, arc voltage 27V, welding current 280A, and sweating heat is defeated
Enter for 13kJ/cm, shield gas flow rate 18L/min.
(2) using specialized for carbon dioxide gas protection weldering filling weldering, welding material is from 980MPa high-strength steel gas shield welding wire (Germany
UnionX90 welding wires), its deposited metal composition is (wt.%) by percentage to the quality：C 0.1%, Si 0.80%, Mn
1.80%, Cr 0.35%, Ni 2.25%, Mo 0.60%；Deposited metal mechanical property is：Tensile strength sigmab>=900MPa, bend
Intensity σ s >=840MPa, elongation δ 16~19% are taken, at room temperature V-notch impact absorbing energy AKV70~85J.Using 100%
CO2Gas shield, welding parameter are：Gage of wire 1.2mm, stem elongation degree 30mm, arc voltage 29V, welding current 320A, weldering
It is 18kJ/cm to connect heat input, shield gas flow rate 16L/min, 140 DEG C of interlayer temperature.
(3) root of weld is cleared up with carbon arc air gouging, and back of weld is polished flat with hand operated grinding wheel piece.
(4) 560MPa high-strength steel gas shield welding wire (morals are selected using the non-melting electrode argon arc welding cosmetic welding that fills silk, welding material
State's UnionI52 welding wires), its deposited metal composition is (wt.%) by percentage to the quality：C 0.08%, Si 0.85%,
Mn 1.50%；Deposited metal mechanical property is：Tensile strength sigmab>=560MPa, yield strength σ s >=450MPa, elongation δ 25
~30%, V-notch impact absorbing energy A at room temperatureKV130~180J.Using 100%CO2Gas shield, welding parameter are：Weldering
Silk diameter 2mm, stem elongation degree 30mm, arc voltage 28V, welding current 260A, thermal weld stress 14kJ/cm, protective gas stream
Measure 20L/min.
(5) after welding finishes corner connection test plate (panel) front, test plate (panel) is overturn, back cover welding is carried out to its back side.Control its temperature
For 150 DEG C, reuse the non-melting electrode argon arc welding that fills silk and carry out back cover welding.Welding wire is from identical with (4) with welding condition.
Postwelding welding point flat appearance is attractive in appearance, the defects of no face crack.V-arrangement lacks at -40 DEG C of the weld metal of acquisition
Mouth impact absorbing energy AKVMore than 47J (being respectively 71J, 88J, 96J), performance requirement can be met.
It should be noted that the foregoing is only the preferred embodiments of the present invention, it is not intended to limit the invention, although
The present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can be right
Technical scheme described in previous embodiment is modified, or carries out equivalent substitution to which part.It is although above-mentioned with reference to attached
The embodiment of the present invention is described figure, but not limiting the scope of the invention, in the skill of the present invention
On the basis of art scheme, those skilled in the art need not pay the various modifications that creative work can make or deformation still exists
Within protection scope of the present invention.
Claims (7)
1. a kind of 1200MPa high strength steels preheating-free combined welding method, it is characterised in that retaining wall on slope, pretreatment；Using two
Carbon oxide gas protection weldering carries out backing welding, and welding wire is 500MPa welding wires；Using the carbon dioxide of mechanical automation filler wire
Gas shielded arc welding is filled welding, and welding wire is 980MPa high-strength steel welding wires；Back chipping；Using mechanical automation silk filling non-melt pole
Argon arc welding carries out capping layer and envelope backing weld, and welding wire is 560MPa high-strength steel welding wires；In the filling welding process, using more
Road multilayer welding, it is 100~150 DEG C to control interlayer temperature；In the filling welding process, welding condition is as follows：Welding wire
Diameter 1.2mm, arc voltage are 26~30V, and welding current is 320~380A, and thermal weld stress is controlled in 10~22kJ/cm,
Shield gas flow rate is 5~25L/min；In backing welding welding process, welding parameter is gage of wire 1.2mm, and arc voltage is
26~30V, welding current are 240~320A, and thermal weld stress is controlled in 15~25kJ/cm, protective gas 100%CO2, protect
Shield gas flow is 15~20L/min.
2. the method as described in claim 1, it is characterised in that in cosmetic welding welding process, welding parameter is gage of wire
2.0mm, arc voltage are 26~30V, and welding current is 240~300A, and control speed of welding is so that welding bead surfacing is bright and clean
Preferably；Protective gas is 100%Ar, and shield gas flow rate is 15~25L/min.
3. the method as described in claim 1, it is characterised in that in back welding welding process, welding parameter is gage of wire
2.0mm, arc voltage are 26~30V, and welding current is 240~280A, and control speed of welding is so that welding bead surfacing is bright and clean
Preferably, protective gas 100%Ar, shield gas flow rate are 15~22L/min.
4. the method as described in claim 1, it is characterised in that a diameter of 1.2mm of the 500MPa welding wires, its deposited metal
Chemical composition is by percentage to the quality：C 0.02~0.15%, Si 0.55~1.10%, Mn 1.40~1.90%, P≤
0.030%, S≤0.030%；Deposited metal mechanical property is：Tensile strength sigma 490~670MPa of b, yield strength σ s >=
400MPa, elongation δ >=18%, 0 DEG C of V-notch impact absorbing energy AKV >=47J；Or the 980MPa high-strength steel welding wire is straight
Footpath is 1.2mm, and its deposited metal composition is by percentage to the quality：C 0.1%, Si 0.80%, Mn 1.80%, Cr
0.35%, Ni 2.25%, Mo 0.60%；Deposited metal mechanical property is：Tensile strength sigma b >=900MPa, yield strength σ s >=
840MPa, elongation δ 16~19%, at room temperature 70~85J of V-notch impact absorbing energy AKV；Or the 560MPa high-strength steel
A diameter of 2.0mm of welding wire, its deposited metal composition are by percentage to the quality：C 0.08%, Si 0.85%, Mn
1.50%；Deposited metal mechanical property is：Tensile strength sigma b >=560MPa, yield strength σ s >=450MPa, elongation δ 25~
30%, 130~180J of V-notch impact absorbing energy AKV at room temperature.
5. the method as described in claim 1, it is characterised in that the carbon dioxide purity is 99.9%.
6. the method as described in claim 1, it is characterised in that in the cosmetic welding welding process, protective gas is purity
99.9%Ar inert gas.
7. 1200MPa high strength steel welding points prepared by any methods describeds of claim 1-6, it is characterised in that the weldering
In joint, the room temperature tensile intensity of weld metal is more than 750MPa, the V-notch punching of weld metal under -40 DEG C of test temperatures
The impact absorbing energy for hitting experiment is more than 47J.
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| CN108526664A (en) * | 2018-06-27 | 2018-09-14 | 中国有色金属工业第六冶金建设有限公司 | One kind being suitable for Q460C high-strength steel butt weld welding methods |
| CN109434244B (en) * | 2018-12-29 | 2021-06-22 | 深圳市瑞凌实业集团股份有限公司 | Double-wire welding method and system |
| CN110000447A (en) * | 2019-05-17 | 2019-07-12 | 广州黄船海洋工程有限公司 | A kind of not preheating gas protection soldering method of EH36 high strength steel slab |
| CN110153583A (en) * | 2019-05-24 | 2019-08-23 | 南京钢铁股份有限公司 | A method of improving Q890DQP steel welded joint obdurability |
| CN110270745A (en) * | 2019-06-28 | 2019-09-24 | 广东中泽重工有限公司 | A kind of welding method for P690QL1 steel flux-cored wire gas metal-arc welding |
| CN114131159A (en) * | 2021-11-26 | 2022-03-04 | 湖南华菱湘潭钢铁有限公司 | Welding method of ultrahigh-strength steel Q1300E steel plate |
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