CN110153583A - A method of improving Q890DQP steel welded joint obdurability - Google Patents
A method of improving Q890DQP steel welded joint obdurability Download PDFInfo
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- CN110153583A CN110153583A CN201910443541.4A CN201910443541A CN110153583A CN 110153583 A CN110153583 A CN 110153583A CN 201910443541 A CN201910443541 A CN 201910443541A CN 110153583 A CN110153583 A CN 110153583A
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- q890dqp
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- Optics & Photonics (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of raising Q890DQP steel welded joint obdurability method, weld seam bottoming uses low 50Kg grade welding wires of strong matching, and weld seam filling and capping, which are selected, etc. strong matches 90Kg grades of welding wire weldings；Using Ar+20%CO2Mixed gas arc welding connects, weld heat input 12-16KJ/cm；Under the conditions of medium restrain, using not preheated weld；Under the conditions of restraining for harshness, more than weld seam weld preheating temperature 50 C, interlayer temperature is controlled at 100-150 DEG C.The method increase the obdurabilities of welding point, so that welding point can reach the service performance to match with base material Q890DQP, welding joint mechanical property is good, weld preheating temperature is reduced simultaneously, production cost is reduced, improves welding environment, effectively improves production efficiency.
Description
Technical field
The present invention relates to a kind of welding methods, and in particular to a method of improve Q890DQP steel welded joint obdurability.
Background technique
Q890DQP steel is the research achievement (M3 technology) based on third generation steel technology in terms of tissue modulation, and use is low
The design of carbon equivalent ingredient, press quenching+tempering process technology production, in order to shorten process, reduce process costs and alloy at
This, develops high-intensity and high-tenacity low-carbon lath bainite/martensite steel using press quenching+tempering process, exists in rolled
The island tiny, Dispersed precipitate MA and carbide, tempering process further adjust tissue and Carbide Precipitation, to reach
The high-intensity and high-tenacity requirement of Q890DQP ultra-high strength for engineering machinery steel plate.
With the development of engineering machinery, coal mine machinery technology, high-ductility ultrahigh-strength structural steel giant caterpillar crane arm,
The engineering machinery such as hydraulic support and the demand in coal mine machinery field increase increasingly.In order to meet mechanized equipment in the presence of a harsh environment
Use demand, high-ductility ultrahigh-strength steel come into being.Welding is to realize the most effective means of steel plate connection.But it uses and passes
When welding procedure of uniting etc. matches by force, weld preheating temperature is higher, and welding environment is poor, and the production cycle is relatively long；Generally
For welding point intensity it is higher, toughness is poorer, and the control of production process is just particularly important.
Summary of the invention
Goal of the invention: in order to overcome the drawbacks of the prior art, it is strong that the present invention provides a kind of raising Q890DQP steel welded joint
The method of toughness, this method can be improved the obdurability of welding point.
Technical solution: a kind of method improving Q890DQP steel welded joint obdurability of the present invention, weld seam bottoming are adopted
With low 50Kg grades of welding wires of strong matching, the 90Kg grades of welding wire weldings of matching by force such as weld seam filling and capping selection；Using Ar+20%CO2
Mixed gas arc welding connects, weld heat input 12-16KJ/cm；Under the conditions of medium restrain, using not preheated weld；It is right
Under the conditions of harshness is restrained, more than weld seam weld preheating temperature 50 C, interlayer temperature is controlled at 100-150 DEG C.
Specifically, including C:0.06-0.15%, Mn in the mass percent ingredient of the 50Kg grades of welding wire :≤1.70%,
Si:0.80-1.15%, P :≤0.025%, S :≤0.025%, Cr :≤0.15%, Ni :≤0.15%, Mo :≤0.15%, V:
≤ 0.03%, Cu :≤0.50%.
Yield strength >=420MPa of the 50Kg grades of welding wire, tensile strength are >=500MPa.
Include C :≤0.10%, Mn:1.25-1.80%, Si in the mass percent ingredient of the 90Kg grades of welding wire:
0.40-0.80%, S :≤0.015%, P :≤0.020%, Ni:1.00-1.50%, Mo:0.30-0.60%, Ti:0.05-
0.10%.
Yield strength >=830MPa of the 90Kg grades of welding wire, tensile strength >=900MPa.
And include C :≤0.087%, Si :≤0.27%, Mn in the mass percent ingredient of applicable Q890DQP base material:
≤ 1.70%, S :≤0.002%, P :≤0.010%, Cr+Ni+Mo :≤1.03%, Nb+V+Ti :≤0.095%.
The utility model has the advantages that this method welds weld seam using two kinds of welding wires, weld seam bottoming is using low strong matched 50kg
Grade welding wire, the 90Kg grades of welding wire weldings of matching by force such as filling and capping selection, and use Ar+20%CO2Mixed gas arc welding connects,
Weld heat input is 12-16KJ/cm.The method increase the obdurabilities of welding point, so that welding point can reach and base material
The service performance that Q890DQP matches, welding joint mechanical property is good, while reducing weld preheating temperature, and reduction is produced into
This, improves welding environment, effectively improves production efficiency.
Detailed description of the invention
Fig. 1 is that small iron grinds test sample schematic diagram；
Fig. 2 is Q890DQP welding groove schematic diagram in embodiment 1；
Fig. 3 is Q890DQP welding groove schematic diagram in embodiment 2.
Specific embodiment
In the following, be described in further details to the present invention in conjunction with the embodiments.
Embodiment 1: base material Q890DQP steel plate with a thickness of 30mm, supply of material state is TMCP, and mass percent ingredient is shown in
Table 1, surplus are Fe and the impurity that must be avoided.
The chemical component of 1 steel plate of table
Wherein, Ceq=C+Mn/6+ (Cu+Ni)/15+ (Cr+Mo+V)
The mechanical property of steel plate is shown in Table 2:
The mechanical property of 2 steel plate of table
Weld preheating temperature is determined by the oblique Y groove welding crack test of Q890DQP.Oblique Y groove welding crack test
It is the sensitivity tests for evaluating carbon steel and low alloy steel welding heat affected zone to cold crack, tests according to GB4675.1-84
" oblique Y type groove welding crack test method " regulation carries out.Test steel plate is 30mm thickness Q890DQP, and BHG- is respectively adopted in welding wire
5,Welding wire and ER50-6,Welding wire.Preheating temperature using BHG-5 welding wire is respectively 50 DEG C and 75 DEG C, is adopted
Preheating temperature with ER50-6 welding wire is respectively 50 DEG C and preheated weld, postwelding do not place 48h and check that face crack, section are split
Line.Oblique Y groove cracking test sample is shown in Fig. 1, and welding condition is shown in Table 3, and test result is shown in Table 4.
The oblique Y groove welding crack test welding condition of table 3
The oblique Y groove welding crack test result of table 4
Grind test from small iron it can be seen that using etc. strong matching welding wire welding, weld preheating temperature do not split at 75 DEG C
Line, and low strong matching welding wire ER50-6 is used, it does not preheat before weldering without cracked, to illustrate that Q890DQP steel uses yet
Strong matching welding pre-heating temperature can be set to 75 DEG C, and select low strong matching welding wire ER50-6 backing welding, and weld preheating temperature can be with
It is substantially reduced.
The welding of test plate (panel): backing welding selects low matching (50Kg grades) ER50-6, and matching is selected by force for filling, cosmetic welding etc.
(90Kg grades) BHG-5, is connect using Ar+20%CO2 mixed gas arc welding.Test piece for welding welding groove form is shown in Fig. 2.
Welding condition is shown in Table 5, because for harsh contained condition (i.e. steel plate surrounding is by contained), weld preheating temperature
50 DEG C, 100-150 DEG C of interlayer temperature, inspection after welding the results are shown in Table 6 and table 7.
5 welding condition of table
6 Q890DQP welding point of table stretches and bending property
7 Q890DQP steel plate impact toughness of welded joint of table
As it can be seen that the welding for harsh contained condition, the weld seam welded using this method, welding point can reach and base material
The service performance that Q890DQP matches, mechanical property are excellent in.
Embodiment 2: base material Q890DQP steel plate with a thickness of 30mm, supply of material state be TMCP, ingredient and mechanical property with
Embodiment 1 is identical, is shown in Table 1, table 2 respectively.
The welding of test plate (panel): backing welding selects low matching (50Kg grades) ER50-6, and matching is selected by force for filling, cosmetic welding etc.
(90Kg grades) BHG-5, is connect using Ar+20%CO2 mixed gas arc welding.Test piece for welding welding groove form is shown in Fig. 3.
Welding condition is shown in Table 8, due to not being preheated before weldering for medium contained condition (i.e. only steel plate two sides by restrain),
Interlayer temperature does not control, and inspection after welding the results are shown in Table 9 and table 10.
8 welding condition of table
9 Q890DQP welding point of table stretches and bending property
10 Q890DQP steel plate impact toughness of welded joint of table
As it can be seen that the welding for medium contained condition, the weld seam welded using this method, welding point can reach and base material
The service performance that Q890DQP matches, mechanical property are excellent in.
Embodiment 3: base material Q890DQP steel plate with a thickness of 30mm, supply of material state is TMCP, and mass percent ingredient is shown in
Table 11, surplus are Fe and the impurity that must be avoided.
The chemical component of 11 steel plate of table
| Chemical component | C | Si | Mn | S | P | Cr+Ni+Mo | Nb+V+Ti |
| Q890DQP | 0.082 | 0.17 | 1.32 | 0.001 | 0.006 | 0.92 | 0.091 |
The mechanical property of steel plate is shown in Table 12:
The mechanical property of 12 steel plate of table
The welding of test plate (panel): backing welding selects low matching (50Kg grades) ER50-6, and matching is selected by force for filling, cosmetic welding etc.
(90Kg grades) BHG-5, is connect using Ar+20%CO2 mixed gas arc welding.Test piece for welding welding groove form and embodiment 2 one
It causes.
Welding condition is shown in Table 13, due to being also medium contained condition, does not preheat before weldering, interlayer temperature does not control, weldering
Testing result is shown in Table 14 and table 15 afterwards.
13 welding condition of table
14 Q890DQP welding point of table stretches and bending property
15 Q890DQP steel plate impact toughness of welded joint of table
As it can be seen that for including C :≤0.087%, Si :≤0.27%, Mn :≤1.70%, S in mass percent ingredient :≤
0.002%, P :≤0.010%, Cr+Ni+Mo :≤1.03%, Nb+V+Ti :≤0.095% Q890DQP base material, using we
The weld seam of method welding, the mechanical property of welding point can reach the service performance to match with base material Q890DQP.
Claims (10)
1. a kind of method for improving Q890DQP steel welded joint obdurability, which is characterized in that weld seam bottoming uses low strong matching
50Kg grades of welding wires, the 90Kg grades of welding wire weldings of matching by force such as weld seam filling and capping selection；
Using Ar+20%CO2Mixed gas arc welding connects, weld heat input 12-16KJ/cm；
Under the conditions of medium restrain, using not preheated weld；Under the conditions of restraining for harshness, weld seam weld preheating temperature is 50
DEG C or more, interlayer temperature is controlled at 100-150 DEG C.
2. the method according to claim 1 for improving Q890DQP steel welded joint obdurability, which is characterized in that described
Include C:0.06-0.15%, Mn :≤1.70%, Si:0.80-1.15%, P in the mass percent ingredient of 50Kg grades of welding wires :≤
0.025%, S :≤0.025%, Cr :≤0.15%, Ni :≤0.15%, Mo :≤0.15%, V :≤0.03%, Cu :≤
0.50%.
3. the method according to claim 2 for improving Q890DQP steel welded joint obdurability, which is characterized in that described
The model ER50-6 of 50Kg grades of welding wires.
4. the method according to claim 2 for improving Q890DQP steel welded joint obdurability, which is characterized in that described
Yield strength >=420MPa of 50Kg grades of welding wires, tensile strength are >=500MPa.
5. the method according to claim 1 for improving Q890DQP steel welded joint obdurability, which is characterized in that described
Include C :≤0.10%, Mn:1.25-1.80%, Si:0.40-0.80%, S in the mass percent ingredient of 90Kg grades of welding wires :≤
0.015%, P :≤0.020%, Ni:1.00-1.50%, Mo:0.30-0.60%, Ti:0.05-0.10%.
6. the method according to claim 5 for improving Q890DQP steel welded joint obdurability, which is characterized in that described
The model BHG-5 of 90Kg grades of welding wires.
7. the method according to claim 5 for improving Q890DQP steel welded joint obdurability, which is characterized in that described
Yield strength >=830MPa of 90Kg grades of welding wires, tensile strength >=900MPa.
8. the method according to claim 1-7 for improving Q890DQP steel welded joint obdurability, feature exist
In including C :≤0.087%, Si :≤0.27%, Mn in the mass percent ingredient of applicable Q890DQP base material :≤
1.70%, S :≤0.002%, P :≤0.010%, Cr+Ni+Mo :≤1.03%, Nb+V+Ti :≤0.095%.
9. the method according to claim 8 for improving Q890DQP steel welded joint obdurability, which is characterized in that applicable
The ingredient of Q890DQP base material contains C:0.087%, Si:0.27%, Mn:1.64%, S:0.002% by percentage to the quality, P:
0.009%, Cr+Ni+Mo:0.99%, Nb+V+Ti:0.094%, B:0.0014%, Al:0.039%, surplus are Fe and can not
The impurity avoided.
10. the method according to claim 8 for improving Q890DQP steel welded joint obdurability, which is characterized in that applicable
The carbon equivalent Ceq of Q890DQP base material is 0.53%.
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| CN201910443541.4A CN110153583A (en) | 2019-05-24 | 2019-05-24 | A method of improving Q890DQP steel welded joint obdurability |
| PCT/CN2019/122909 WO2020238129A1 (en) | 2019-05-24 | 2019-12-04 | Method for enhancing strength and toughness of welded joint formed on q890dqp steel |
| AU2019448393A AU2019448393B2 (en) | 2019-05-24 | 2019-12-04 | Method for enhancing strength and toughness of welded joint formed on Q890DQP steel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020238129A1 (en) * | 2019-05-24 | 2020-12-03 | 南京钢铁股份有限公司 | Method for enhancing strength and toughness of welded joint formed on q890dqp steel |
| CN113275710A (en) * | 2021-05-31 | 2021-08-20 | 郑州煤矿机械集团股份有限公司 | Non-preheating welding method for 750MPa grade high-strength steel medium plate for hydraulic support |
| CN113305459A (en) * | 2021-05-20 | 2021-08-27 | 中煤北京煤矿机械有限责任公司 | Welding method for quenched and tempered steel plate with pressure of not less than 900MPa |
| CN113510342A (en) * | 2021-06-30 | 2021-10-19 | 郑州煤矿机械集团股份有限公司 | Low-preheating welding method for Q690-grade quenched and tempered steel medium plate for hydraulic support |
| CN114734125A (en) * | 2022-03-10 | 2022-07-12 | 山东钢铁集团日照有限公司 | Preheating-free welding method suitable for 500 HB-grade wear-resistant steel |
| CN115178839A (en) * | 2022-07-14 | 2022-10-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving bending performance of QStE steel plate welded joint |
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| CN114309899B (en) * | 2022-02-09 | 2023-04-14 | 江苏省沙钢钢铁研究院有限公司 | Welding method of low-alloy wear-resistant steel and welding joint thereof |
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| WO2020238129A1 (en) * | 2019-05-24 | 2020-12-03 | 南京钢铁股份有限公司 | Method for enhancing strength and toughness of welded joint formed on q890dqp steel |
| CN113305459A (en) * | 2021-05-20 | 2021-08-27 | 中煤北京煤矿机械有限责任公司 | Welding method for quenched and tempered steel plate with pressure of not less than 900MPa |
| CN113275710A (en) * | 2021-05-31 | 2021-08-20 | 郑州煤矿机械集团股份有限公司 | Non-preheating welding method for 750MPa grade high-strength steel medium plate for hydraulic support |
| CN113510342A (en) * | 2021-06-30 | 2021-10-19 | 郑州煤矿机械集团股份有限公司 | Low-preheating welding method for Q690-grade quenched and tempered steel medium plate for hydraulic support |
| CN114734125A (en) * | 2022-03-10 | 2022-07-12 | 山东钢铁集团日照有限公司 | Preheating-free welding method suitable for 500 HB-grade wear-resistant steel |
| CN114734125B (en) * | 2022-03-10 | 2024-01-23 | 山东钢铁集团日照有限公司 | Preheating-free welding method suitable for 500 HB-grade wear-resistant steel |
| CN115178839A (en) * | 2022-07-14 | 2022-10-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving bending performance of QStE steel plate welded joint |
| CN115178839B (en) * | 2022-07-14 | 2024-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving bending performance of QSTE steel plate welded joint |
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| AU2019448393B2 (en) | 2024-02-29 |
| AU2019448393A1 (en) | 2022-01-20 |
| WO2020238129A1 (en) | 2020-12-03 |
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