CN107971610B - Gas shielded welding process special for high-Ti and ultrahigh-strength steel - Google Patents

Gas shielded welding process special for high-Ti and ultrahigh-strength steel Download PDF

Info

Publication number
CN107971610B
CN107971610B CN201711139388.3A CN201711139388A CN107971610B CN 107971610 B CN107971610 B CN 107971610B CN 201711139388 A CN201711139388 A CN 201711139388A CN 107971610 B CN107971610 B CN 107971610B
Authority
CN
China
Prior art keywords
welding
charpy impact
joint
ultrahigh
strength steel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201711139388.3A
Other languages
Chinese (zh)
Other versions
CN107971610A (en
Inventor
马玉喜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan Iron and Steel Co Ltd
Original Assignee
Wuhan Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan Iron and Steel Co Ltd filed Critical Wuhan Iron and Steel Co Ltd
Priority to CN201711139388.3A priority Critical patent/CN107971610B/en
Publication of CN107971610A publication Critical patent/CN107971610A/en
Application granted granted Critical
Publication of CN107971610B publication Critical patent/CN107971610B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • 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
    • B23K35/3073—Fe as the principal constituent with Mn as next major 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
    • B23K9/00—Arc welding or cutting
    • B23K9/235—Preliminary treatment

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Arc Welding In General (AREA)

Abstract

The invention discloses a special gas shielded welding process for high-Ti and ultrahigh-strength steel, which comprises the following steps of: 1) joint processing: machining the butt joint part into a V-shaped groove, wherein the angle of the groove is 45-60 degrees; 2) pretreatment: cleaning the surface of the groove before welding to remove rust; 3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: c: 0.10 to 0.30, Si: 0.21 to 1.55, Mn: 2.00-3.50, Ti: 0.36-0.75, N: 0.005-0.008, less than or equal to 0.008P, less than or equal to 0.003S, and the balance Fe and inevitable impurities; 4) welding: adopting a direct current power supply positive connection method, using nitrogen as protective gas to carry out welding, wherein the welding process parameters are as follows: the welding current is 200-300A, the welding voltage is 20-34V, the welding speed is 10-33 cm/min, the flow of protective gas is 5-18L/min, and the temperature between welding passes is controlled to be 100-190 ℃. The invention adopts nitrogen as protective gas to carry out welding, and the welding material selects a special welding wire containing Ti steel according to the principle of equal-strength matching, thereby improving the toughness and plasticity of a welding joint.

Description

Gas shielded welding process special for high-Ti and ultrahigh-strength steel
Technical Field
The invention relates to a welding process of steel, in particular to a special gas shielded welding process for high-Ti and ultrahigh-strength steel.
Background
With the development of engineering and equipment toward large-scale, light-weight and high-efficiency, Ti-containing microalloyed steel is favored by more and more manufacturing enterprises due to good strengthening effect and low alloying cost, but the strength and impact toughness of a welded joint are easily reduced due to improper selection of welding materials and welding processes in the welding process.
In the prior art, Chinese invention patent with the patent number ZL201110045723.X discloses CO of 800MPa high-strength steel2Gas shielded welding process using CO2The gas shielded welding and direct current power supply reverse connection method has the advantages of simple process, strong operability, low welding energy consumption and low welding cost; the Chinese invention patent with the patent number ZL201510520404.8 discloses a special gas shielded welding process for 800 MPa-grade Ti-containing steel, a direct-current power supply reverse connection method is adopted, nitrogen is used as shielding gas for welding, specific welding wires special for the Ti-containing steel are selected as welding materials according to the principle of equal-strength matching, and the special gas shielded welding process is high in operability, simple and easy in process and low in cost.
However, the welded joint formed by the first method disclosed above has coarse and uneven grains, resulting in strength and impact toughness far from meeting the welding requirements of Ti-containing steels; the chemical composition of the second welding wire adopts a low-carbon design, and the Ti content is not high. Therefore, in order to make up for the above disadvantages, a new welding process is needed to solve the problems of weldability, matching welding materials and welding process of the steel plate with higher carbon and titanium contents, thereby promoting the application and rapid development of the high-Ti steel.
Disclosure of Invention
The invention aims to provide a special gas shielded welding process for high-Ti ultrahigh-strength steel, which can obviously refine crystal grains of a welding joint, improve the strength, impact toughness and plasticity of the welding joint and ensure that the comprehensive physical property of the welding joint meets the production requirement.
In order to achieve the purpose, the special gas shielded welding process for the high-Ti and ultrahigh-strength steel is characterized by comprising the following steps of: the method comprises the following steps:
1) joint processing: machining the butt joint part into a V-shaped groove, wherein the angle of the groove is 45-60 degrees;
2) pretreatment: cleaning the surface of the groove before welding to remove rust;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: c: 0.10 to 0.30, Si: 0.21 to 1.55, Mn: 2.00-3.50, Ti: 0.36-0.75, N: 0.005-0.008, less than or equal to 0.008P, less than or equal to 0.003S, and the balance Fe and inevitable impurities;
4) welding: adopting a direct current power supply positive connection method, using nitrogen as protective gas to carry out welding, wherein the welding process parameters are as follows: the welding current is 200-300A, the welding voltage is 20-34V, the welding speed is 10-33 cm/min, the flow of protective gas is 5-18L/min, and the temperature between welding passes is controlled to be 100-190 ℃.
Preferably, in the step 1), the bevel angle is 50-60 degrees.
Further, in the step 3), the diameter of the welding wire is 1.2-1.5 mm, and the tensile strength is 850-950 MPa.
Most preferably, in the step 3), the diameter of the welding wire is 1.5mm, and the tensile strength is 900 MPa.
Further, in the step 3), C: 0.11 to 0.29, Si: 0.21 to 1.54, Mn: 2.10 to 3.42, Ti: 0.38-0.74, N: 0.04-0.007, P is less than or equal to 0.006, S is less than or equal to 0.002, and the balance is Fe and inevitable impurities.
Further, in the step 3), C: 0.11 to 0.25, Si: 0.85 to 1.34, Mn: 2.10 to 3.42, Ti: 0.38-0.74, N: 0.005-0.006, P is less than or equal to 0.006, S is less than or equal to 0.002, and the balance is Fe and inevitable impurities.
Further, the welding process parameters are as follows: the welding current is 200-250A, the welding voltage is 20-30V, the welding speed is 20-30 cm/min, the flow of protective gas is 5-15L/min, and the temperature between welding beads is controlled at 150-190 ℃.
Preferably, the welding process parameters are: the welding current is 210-239A, the welding voltage is 22-28V, the welding speed is 22-30 cm/min, the flow of protective gas is 8-12L/min, and the temperature between welding passes is controlled to be 150-190 ℃.
Compared with the prior art, the invention has the following advantages:
firstly, the nitrogen is adopted as the protective gas for welding, the gas flow needs to be strictly controlled, and the gas flow is ensured to be 5-18L/min, so that the ionized active N atoms in the nitrogen can be combined with Ti in a welding joint in an extreme environment like welding to form dispersed and fine TiN, the crystal grains of the welding joint are obviously refined, and the obdurability matching of the welding joint is obviously optimized. When the flow of the protective gas is lower than 5L/min, the flow of the protective gas is insufficient, a large amount of oxygen in the air can be mixed into the protective gas, and a welding wire and a base metal are oxidized during welding, so that the performance of a welding joint is obviously deteriorated; when the flow of the protective gas is higher than 18L/min, a large amount of nitrogen can ionize a large amount of active N atoms, a large amount of active N atoms can form TiN with a large size after being combined with Ti of a welding joint, and the large TiN particles can not refine austenite grains and can also obviously deteriorate the impact toughness of steel.
Secondly, the content of Ti in the chemical components of the welding wire is strictly controlled, C, N, S atoms interact with Ti together after the welding wire is welded with a base metal to generate dispersed fine Ti (C, N) particles, so that the content of effective Ti can be improved, the strength is improved, and the toughness of a welding joint can be improved.
Thirdly, the invention adopts nitrogen as protective gas to carry out welding, the welding material selects specific welding wires special for Ti-containing steel according to the principle of equal-strength matching, the toughness and plasticity of a welding joint can be improved, particularly the low-temperature impact toughness, the elongation and the like are greatly improved, the comprehensive mechanical property is ensured, the welding cost is obviously reduced on the premise of ensuring the welding quality, and good economic benefit is obtained.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1:
base material: the high-Ti ultrahigh-strength steel plate comprises the following chemical components: 0.25, Si: 0.93, Mn: 3.5, P: 0.007, S: 0.002, Ti: 0.56, Mo: 0.15, Als: 0.025, N: 0.005 and the balance of Fe and inevitable impurities; the tensile strength of the parent metal is 1532MPa, and the Charpy impact energy A is at-40 DEG CKVThe test panel size was 600mm × 300mm × 10mm, 77J.
The invention relates to a special gas shielded welding process for high-Ti ultrahigh-strength steel, which comprises the following steps of:
1) joint processing: machining a V-shaped groove at the joint, wherein the angle of the groove is 45 degrees;
2) pretreatment: before welding, mechanically treating the surface of the groove to remove rust and expose the metal luster;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: 0.11, Si: 0.85, Mn: 2.70, Ti: 0.38, N: 0.006, P: 0.006, S: 0.002, the balance being Fe and inevitable impurities, the diameter of the welding wire being 1.5mm, the tensile strength being 900 MPa;
4) welding: adopting a direct current power supply positive connection method, using nitrogen as protective gas to carry out welding, wherein the welding process parameters are as follows: the welding current is 210A, the welding voltage is 28V, the welding speed is 22cm/min, and the gas flow is 8L/min; the gas shielded welding adopts multilayer and multi-pass continuous welding, the temperature between welding passes is controlled to be 150-190 ℃, and the welded test plates are I-grade after 100% ultrasonic flaw detection.
The welding process is adopted to weld the mechanical property of the welding joint of the high Ti ultrahigh strength steel, the tensile strength of the welding joint reaches 910MPa, and the Charpy impact energy A at the welding seam of-40 DEG CKV67J, weld line-40 ℃ Charpy impact power AKV76J, heat affected zone 1mm away from fusion line-40 deg.C Charpy impact power AKV78J, heat affected zone 3mm away from fusion line-40 deg.C Charpy impact power AKV82J, and Charpy impact power A at-40 ℃ in a heat affected zone 5mm away from a fusion lineKV87J, heat affected zone 7mm from fusion line-40 deg.C Charpy impact power AKV90J, heat affected zone 20mm away from fusion line-40 deg.C Charpy impact power AKV＝88J。
Example 2:
base material: the high-Ti ultrahigh-strength steel plate comprises the following chemical components: 0.25, Si: 0.93, Mn: 3.5, P: 0.007, S: 0.002, Ti: 0.56, Mo: 0.15, Als: 0.025, N: 0.005 and the balance of Fe and inevitable impurities. The tensile strength of the parent metal is 1575MPa, and the Charpy impact energy A is at-40 DEG CKVThe test panel size was 600mm × 300mm × 10mm, 86J.
The invention relates to a special gas shielded welding process for high-Ti ultrahigh-strength steel, which comprises the following steps of:
1) joint processing: machining a V-shaped groove at the joint, wherein the angle of the groove is 60 degrees;
2) pretreatment: before welding, mechanically treating the surface of the groove to remove rust and expose the metal luster;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: 0.15, Si: 0.91, Mn: 3.00, Ti: 0.41, N: 0.006, P: 0.004, S: 0.001, the balance being Fe and inevitable impurities, the diameter of the welding wire being 1.5mm, and the tensile strength being 900 MPa;
4) welding: adopting a direct-current power supply positive connection method, and using nitrogen as protective gas to carry out welding, wherein the welding process comprises the following steps: the welding current 218A, the welding voltage 24V, the welding speed 27cm/min and the gas flow are 11L/min; the gas shielded welding adopts multilayer and multi-pass continuous welding, the temperature between welding passes is controlled to be 150-190 ℃, and the welded test plates are I-grade after 100% ultrasonic flaw detection.
The welding process is adopted to weld the mechanical property of the welding joint of the high Ti ultrahigh strength steel, the tensile strength of the welding joint reaches 932MPa, and the Charpy impact energy A at the welding seam area of 40 ℃ below zeroKV66J, fusion line-40 deg.C Charpy impact power AKV67J, heat affected zone 1mm from fusion line-40 deg.C Charpy impact power AKV71J, and Charpy impact power A at-40 ℃ in a heat affected zone at 3mm from a fusion lineKV78J, 5mm from the weld lineImpact area Charpy impact energy A at-40 DEG CKV81J, heat affected zone 7mm away from fusion line-40 ℃ Charpy impact power AKV89J, heat affected zone 20mm away from fusion line-40 deg.C Charpy impact power AKV＝88J。
Example 3:
base material: the high-Ti ultrahigh-strength steel plate comprises the following chemical components: 0.25, Si: 0.93, Mn: 3.5, P: 0.007, S: 0.002, Ti: 0.56, Mo: 0.15, Als: 0.025, N: 0.005 and the balance of Fe and inevitable impurities. The tensile strength of the parent metal is 1572MPa, and the Charpy impact energy A is at-40 DEG CKVThe test panel size was 600mm × 300mm × 10mm, 79J.
The invention relates to a special gas shielded welding process for high-Ti ultrahigh-strength steel, which comprises the following steps of:
1) joint processing: machining a V-shaped groove at the joint, wherein the angle of the groove is 50 degrees;
2) pretreatment: before welding, mechanically treating the surface of the groove to remove rust and expose the metal luster;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: 0.18, Si: 0.96, Mn: 3.20, Ti: 0.52, N: 0.005, P: 0.005, S: 0.002, the balance being Fe and inevitable impurities, the diameter of the welding wire being 1.5mm, and the tensile strength being 900 MPa;
4) welding: adopting a direct-current power supply positive connection method, and using nitrogen as protective gas to carry out welding, wherein the welding process comprises the following steps: the welding current is 232A, the welding voltage is 26V, the welding speed is 29cm/min, and the gas flow is 14L/min; the gas shielded welding adopts multilayer and multi-pass continuous welding, the temperature between welding passes is controlled to be 150-190 ℃, and the welded test plates are I-grade after 100% ultrasonic flaw detection.
The welding process is adopted to weld the mechanical property of the welding joint of the high Ti ultrahigh strength steel, the tensile strength of the welding joint reaches 934MPa, and the Charpy impact energy A at the welding seam area of-40 DEG CKV85J, fusion line-40 deg.C Charpy impact power AKV87J, heat affected zone 1mm away from fusion line-40 deg.C Charpy impact power AKV91J, heat affected zone 3mm away from fusion line-40 deg.C Charpy impact power AKV93J, heat affected zone 5mm away from fusion line-40 deg.C Charpy impact power AKV97J, heat affected zone 7mm away from fusion line-40 deg.C Charpy impact power AKV96J, heat affected zone 20mm away from fusion line-40 deg.C Charpy impact power AKV＝95J。
Example 4:
base material: the high-Ti ultrahigh-strength steel plate comprises the following chemical components: 0.25, Si: 0.93, Mn: 3.5, P: 0.007, S: 0.002, Ti: 0.56, Mo: 0.15, Als: 0.025, N: 0.005 and the balance of Fe and inevitable impurities. The tensile strength of the parent metal is 1567MPa, and the Charpy impact energy A is at-40 DEG CKVThe test panel size was 600mm × 300mm × 10mm 87J.
The invention relates to a special gas shielded welding process for high-Ti ultrahigh-strength steel, which comprises the following steps of:
1) joint processing: machining a V-shaped groove at the joint, wherein the angle of the groove is 55 degrees;
2) pretreatment: before welding, mechanically treating the surface of the groove to remove rust and expose the metal luster;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: 0.21, Si: 0.97, Mn: 3.32, Ti: 0.57, N: 0.005, P: 0.004, S: 0.002, the balance being Fe and inevitable impurities, the diameter of the welding wire being 1.2mm, and the tensile strength being 900 MPa;
4) welding: adopting a direct-current power supply positive connection method, and using nitrogen as protective gas to carry out welding, wherein the welding process comprises the following steps: welding current 280A, welding voltage 34V, welding speed 32cm/min and gas flow 18L/min; the gas shielded welding adopts multilayer and multi-pass continuous welding, the temperature between welding passes is controlled to be 100-150 ℃, and the welded test plates are I-grade after 100% ultrasonic flaw detection.
The welding process is adopted to weld the mechanical property of the welding joint of the high Ti ultrahigh strength steel, the tensile strength of the welding joint reaches 834MPa, and the Charpy impact energy A is lower than the welding line area at 40 ℃ below zeroKV88J, fusion line-40 deg.C Charpy impact power AKV91J, heat affected zone 1mm away from fusion line-40 deg.C Charpy impact power AKV94J, heat affected zone 3mm away from fusion line and Charpy impact energy A at-40 ℃KV98J, heat affected zone 5mm away from fusion line-40 deg.C Charpy impact power AKV103J heat affected zone at 7mm from the weld line-40Charpy impact energy A at CKV105J, heat affected zone 20mm away from fusion line-40 deg.C Charpy impact power AKV＝98J。
Example 5:
base material: the high-Ti ultrahigh-strength steel plate comprises the following chemical components: 0.25, Si: 0.93, Mn: 3.5, P: 0.007, S: 0.002, Ti: 0.56, Mo: 0.15, Als: 0.025, N: 0.005 and the balance of Fe and inevitable impurities. The tensile strength of the parent metal is 1567MPa, and the Charpy impact energy A is at-40 DEG CKVThe test panel size was 600mm × 300mm × 10mm, 84J.
The invention relates to a special gas shielded welding process for high-Ti ultrahigh-strength steel, which comprises the following steps of:
1) joint processing: machining a V-shaped groove at the joint, wherein the angle of the groove is 60 degrees;
2) pretreatment: before welding, mechanically treating the surface of the groove to remove rust and expose the metal luster;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: 0.27, Si: 1.11, Mn: 3.42, Ti: 0.63, N: 0.007, P: 0.006, S: 0.001, the balance being Fe and inevitable impurities, the diameter of the welding wire being 1.5mm, and the tensile strength being 900 MPa;
4) welding: adopting a direct-current power supply positive connection method, and using nitrogen as protective gas to carry out welding, wherein the welding process comprises the following steps: the welding current is 300A, the welding voltage is 32V, the welding speed is 33cm/min, and the gas flow is 16L/min; the gas shielded welding adopts multilayer and multi-pass continuous welding, the temperature between welding passes is controlled to be 100-150 ℃, and the welded test plates are I-grade after 100% ultrasonic flaw detection.
The welding process is adopted to weld the mechanical property of the welding joint of the high Ti ultrahigh strength steel, the tensile strength of the welding joint reaches 942MPa, and the Charpy impact energy A is lower than the welding line area at minus 40 DEG CKV(68J) weld line-40 deg.C Charpy impact power AKV71J, heat affected zone 1mm away from fusion line and Charpy impact power A at-40 ℃KV85J, heat affected zone at 3mm from fusion line-40 deg.C Charpy impact power AKV87J, heat affected zone 5mm from fusion line-40 deg.C Charpy impact power AKV95J, heat affected zone 7mm away from fusion line and Charpy impact power A at-40 ℃KV97J, melting offHeat affected zone at 20mm of joint line-40 ℃ Charpy impact energy AKV＝105J。
Example 6:
base material: the high-Ti ultrahigh-strength steel plate comprises the following chemical components: 0.25, Si: 0.93, Mn: 3.5, P: 0.007, S: 0.002, Ti: 0.56, Mo: 0.15, Als: 0.025, N: 0.005 and the balance of Fe and inevitable impurities. The tensile strength of the parent metal is 1543MPa, and the Charpy impact energy A is-40 DEG CKVThe test panel size was 600mm × 300mm × 10mm, 89J.
The invention relates to a special gas shielded welding process for high-Ti ultrahigh-strength steel, which comprises the following steps of:
1) joint processing: machining a V-shaped groove at the joint, wherein the angle of the groove is 55 degrees;
2) pretreatment: before welding, mechanically treating the surface of the groove to remove rust and expose the metal luster;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: 0.29,
si: 0.21, Mn: 2.52, Ti: 0.67, N: 0.004, P: 0.005, S: 0.001, the balance being Fe and inevitable impurities, the diameter of the welding wire being 1.5mm, and the tensile strength being 900 MPa;
4) welding: adopting a direct-current power supply positive connection method, and using nitrogen as protective gas to carry out welding, wherein the welding process comprises the following steps: the welding current is 216A, the welding voltage is 26V, the welding speed is 26cm/min, and the gas flow is 9L/min; the gas shielded welding adopts multilayer and multi-pass continuous welding, the temperature between welding passes is controlled to be 150-190 ℃, and the welded test plates are I-grade after 100% ultrasonic flaw detection.
The welding process is adopted to weld the mechanical property of the welding joint of the high Ti ultrahigh strength steel, the tensile strength of the welding joint reaches 945MPa, and the Charpy impact energy A is lower than 40 ℃ below zero in a welding seam areaKV76J, fusion line-40 ℃ Charpy impact power AKV78J, heat affected zone 1mm away from fusion line-40 deg.C Charpy impact power AKV81J, the specific impact power AKV is 90J at the heat affected zone of-40 ℃ at the position 3mm away from a fusion line, and the specific impact power A is 90J at the heat affected zone of-40 ℃ at the position 5mm away from the fusion lineKV92J, heat affected zone 7mm away from fusion line-40 ℃ Charpy impact power AKV93J, heat affected zone at 20mm from the weld line-40Charpy impact energy A at CKV＝98J。
Example 7:
base material: the high-Ti ultrahigh-strength steel plate comprises the following chemical components: 0.25, Si: 0.93, Mn: 3.5, P: 0.007, S: 0.002, Ti: 0.56, Mo: 0.15, Als: 0.025, N: 0.005 and the balance of Fe and inevitable impurities. The tensile strength of the parent metal is 1579MPa, and the Charpy impact energy A is at-40 DEG CKVThe test panel size was 600mm × 300mm × 10mm 87J.
The invention relates to a special gas shielded welding process for high-Ti ultrahigh-strength steel, which comprises the following steps of:
1) joint processing: machining a V-shaped groove at the joint, wherein the angle of the groove is 45 degrees;
2) pretreatment: before welding, mechanically treating the surface of the groove to remove rust and expose the metal luster;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: 0.12, Si: 1.54, Mn: 2.64, Ti: 0.47, N: 0.005, P: 0.007, S: 0.002, the balance being Fe and inevitable impurities, the diameter of the welding wire being 1.5m, and the tensile strength being 900 MPa;
4) welding: adopting a direct current power supply positive method, using nitrogen as protective gas to carry out welding, wherein the welding process comprises the following steps: the welding current is 232A, the welding voltage is 21V, the welding speed is 22cm/min, and the gas flow is 6L/min; the gas shielded welding adopts multilayer and multi-pass continuous welding, the temperature between welding passes is controlled to be 150-190 ℃, and the welded test plates are I-grade after 100% ultrasonic flaw detection.
The welding process is adopted to weld the mechanical property of the high-Ti ultrahigh-strength steel welding joint, the tensile strength of the welding joint reaches 943MPa, and the Charpy impact energy A is lower than the Charpy impact energy A at the temperature of minus 40 ℃ in a welding seam areaKV71J, fusion line-40 ℃ Charpy impact power AKV78J, heat affected zone 1mm away from fusion line-40 deg.C Charpy impact power AKV85J, heat affected zone at 3mm from fusion line-40 deg.C Charpy impact power AKV88J, and Charpy impact power A at-40 ℃ in a heat affected zone 5mm away from a fusion lineKV96J, heat affected zone 7mm away from fusion line-40 deg.C Charpy impact power AKV95J, heat affected zone 20mm away from fusion line-40 deg.C Charpy impact power AKV＝97J。
Example 8:
base material: the high-Ti ultrahigh-strength steel plate comprises the following chemical components: 0.25, Si: 0.93, Mn: 3.5, P: 0.007, S: 0.002, Ti: 0.56, Mo: 0.15, Als: 0.025, N: 0.005 and the balance of Fe and inevitable impurities. The tensile strength of the parent metal is 1567MPa, and the Charpy impact energy A is at-40 DEG CKVThe test panel size was 600mm × 300mm × 10mm, 82J.
The invention relates to a special gas shielded welding process for high-Ti ultrahigh-strength steel, which comprises the following steps of:
1) joint processing: machining a V-shaped groove at the joint, wherein the angle of the groove is 50 degrees;
2) pretreatment: before welding, mechanically treating the surface of the groove to remove rust and expose the metal luster;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: 0.15, Si: 0.91, Mn: 3.00, Ti: 0.41, N: 0.006, P: 0.004, S: 0.001, the balance being Fe and inevitable impurities, the diameter of the welding wire being 1.2mm, and the tensile strength being 850 MPa;
4) welding: adopting a direct-current power supply positive connection method, and using nitrogen as protective gas to carry out welding, wherein the welding process comprises the following steps: the welding current is 250A, the welding voltage is 30V, the welding speed is 30cm/min, and the gas flow is 19L/min; the gas shielded welding adopts multilayer and multi-pass continuous welding, the temperature between welding passes is controlled to be 100-150 ℃, and the welded test plates are I-grade after 100% ultrasonic flaw detection.
The welding process is adopted to weld the mechanical property of the welding joint of the high Ti ultrahigh strength steel, the tensile strength of the welding joint reaches 921MPa, and the Charpy impact energy A is lower than the welding line area at minus 40 DEG CKV79J, fusion line-40 ℃ Charpy impact power AKV86J, heat affected zone 1mm away from fusion line and Charpy impact power A at-40 deg.CKV89J, and a heat affected zone at 3mm from a fusion line and a Charpy impact power A at-40 DEG CKV93J, heat affected zone 5mm away from fusion line-40 deg.C Charpy impact power AKV97J, heat affected zone 7mm away from fusion line-40 deg.C Charpy impact power AKV99J, heat affected zone 20mm away from fusion line-40 deg.C Charpy impact power AKV＝98J。
Example 9:
base material: the high-Ti ultrahigh-strength steel plate comprises the following chemical components: 0.25, Si: 0.93, Mn: 3.5, P: 0.007, S: 0.002, Ti: 0.56, Mo: 0.15, Als: 0.025, N: 0.005 and the balance of Fe and inevitable impurities. The tensile strength of the parent metal is 1573MPa, and the Charpy impact energy A is at-40 DEG CKVThe test panel size was 600mm × 300mm × 10mm, 85J.
The invention relates to a special gas shielded welding process for high-Ti ultrahigh-strength steel, which comprises the following steps of:
1) joint processing: machining a V-shaped groove at the joint, wherein the angle of the groove is 60 degrees;
2) pretreatment: before welding, mechanically treating the surface of the groove to remove rust and expose the metal luster;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: 0.25, Si: 1.34, Mn: 2.10, Ti: 0.74, N: 0.005, P: 0.006, S: 0.001, the balance being Fe and inevitable impurities, the diameter of the welding wire being 1.5mm, and the tensile strength being 950 MPa;
4) welding: adopting a direct-current power supply positive connection method, and using nitrogen as protective gas to carry out welding, wherein the welding process comprises the following steps: welding current 247A, welding voltage 23V, welding speed 27cm/min, and gas flow 7L/min; the gas shielded welding adopts multilayer and multi-pass continuous welding, the temperature between welding passes is controlled to be 150-190 ℃, and the welded test plates are I-grade after 100% ultrasonic flaw detection.
The welding process is adopted to weld the mechanical property of the welding joint of the high Ti ultrahigh strength steel, the tensile strength of the welding joint reaches 889MPa, and the Charpy impact energy A is lower than the welding joint area at minus 40 DEG CKV79J, fusion line-40 ℃ Charpy impact power AKV73J, heat affected zone 1mm away from fusion line-40 deg.C Charpy impact power AKV77J, heat affected zone 3mm from fusion line-40 deg.C Charpy impact power AKV87J, heat affected zone 5mm from fusion line-40 deg.C Charpy impact power AKV83J, heat affected zone 7mm away from fusion line-40 deg.C Charpy impact power AKV82J, heat affected zone 20mm away from fusion line-40 ℃ Charpy impact power AKV＝84J。
Example 10:
base material: high Ti content and high Ti contentThe chemical composition of the steel plate is C: 0.25, Si: 0.93, Mn: 3.5, P: 0.007, S: 0.002, Ti: 0.56, Mo: 0.15, Als: 0.025, N: 0.005 and the balance of Fe and inevitable impurities. The tensile strength of the parent metal is 1567MPa, and the Charpy impact energy A is at-40 DEG CKVThe test panel size was 600mm × 300mm × 10mm, 72J.
The invention relates to a special gas shielded welding process for high-Ti ultrahigh-strength steel, which comprises the following steps of:
1) joint processing: machining a V-shaped groove at the joint, wherein the angle of the groove is 50 degrees;
2) pretreatment: before welding, mechanically treating the surface of the groove to remove rust and expose the metal luster;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: 0.23, Si: 1.43, Mn: 3.48, Ti: 0.37, N: 0.006, P: 0.005, S: 0.002 the balance of Fe and inevitable impurities, the diameter of the welding wire is 1.5mm, and the tensile strength is 900 MPa;
4) welding: adopting a direct-current power supply positive connection method, and using nitrogen as protective gas to carry out welding, wherein the welding process comprises the following steps: the welding current is 239A, the welding voltage is 22V, the welding speed is 10cm/min, and the gas flow is 12L/min; the gas shielded welding adopts multilayer and multi-pass continuous welding, the temperature between welding passes is controlled to be 150-190 ℃, and the welded test plates are I-grade after 100% ultrasonic flaw detection.
The welding process is adopted to weld the mechanical property of the welding joint of the high Ti ultrahigh strength steel, the tensile strength of the welding joint reaches 917MPa, and the Charpy impact energy A is lower than the welding line area at 40 ℃ below zeroKV77J, fusion line-40 ℃ Charpy impact power AKV81J, heat affected zone 1mm away from fusion line-40 deg.C Charpy impact power AKV87J, heat affected zone 3mm away from fusion line-40 deg.C Charpy impact power AKV91J, heat affected zone 5mm away from fusion line-40 deg.C Charpy impact power AKV95J, heat affected zone 7mm away from fusion line and Charpy impact power A at-40 ℃KV96J, heat affected zone 20mm away from fusion line-40 deg.C Charpy impact power AKV＝96J。
Example 11:
base material: the high-Ti ultrahigh-strength steel plate comprises the following chemical components: 0.25, Si: 0.93,mn: 3.5, P: 0.007, S: 0.002, Ti: 0.56, Mo: 0.15, Als: 0.025, N: 0.005 and the balance of Fe and inevitable impurities. The tensile strength of the parent metal is 1567MPa, and the Charpy impact energy A is at-40 DEG CKVThe test panel size was 600mm × 300mm × 10mm, 84J.
The invention relates to a special gas shielded welding process for high-Ti ultrahigh-strength steel, which comprises the following steps of:
1) joint processing: machining a V-shaped groove at the joint, wherein the angle of the groove is 50 degrees;
2) pretreatment: before welding, mechanically treating the surface of the groove to remove rust and expose the metal luster;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: 0.10, Si: 0.21, Mn: 3.50, Ti: 0.75, N: 0.005, P: 0.008, S: 0.003 of iron, the balance being Fe and inevitable impurities, the diameter of the welding wire being 1.5mm, the tensile strength being 900 MPa;
4) welding: adopting a direct-current power supply positive connection method, and using nitrogen as protective gas to carry out welding, wherein the welding process comprises the following steps: the welding current is 200A, the welding voltage is 20V, the welding speed is 33cm/min, and the gas flow is 5L/min; the gas shielded welding adopts multilayer and multi-pass continuous welding, the temperature between welding passes is controlled to be 150-190 ℃, and the welded test plates are I-grade after 100% ultrasonic flaw detection.
The welding process is adopted to weld the mechanical property of the welding joint of the high Ti ultrahigh strength steel, the tensile strength of the welding joint reaches 918MPa, and the Charpy impact energy A at the welding seam area of 40 ℃ below zeroKV78J, weld line-40 ℃ Charpy impact power AKV82J, heat affected zone 1mm away from fusion line and Charpy impact power A at-40 ℃KV88J, and Charpy impact power A at-40 ℃ in a heat affected zone at 3mm from a fusion lineKV92J, heat affected zone 5mm away from fusion line-40 ℃ Charpy impact power AKV96J, heat affected zone 7mm away from fusion line-40 deg.C Charpy impact power AKV97J, heat affected zone 20mm away from fusion line-40 deg.C Charpy impact power AKV＝97J。
Example 12:
base material: the high-Ti ultrahigh-strength steel plate comprises the following chemical components: 0.25, Si: 0.93, Mn: 3.5, P: 0.007, S: 0.002, Ti: 0.56,mo: 0.15, Als: 0.025, N: 0.005 and the balance of Fe and inevitable impurities. The tensile strength of the parent metal is 1567MPa, and the Charpy impact energy A is at-40 DEG CKVThe test panel size was 600mm × 300mm × 10mm, 81J.
The invention relates to a special gas shielded welding process for high-Ti ultrahigh-strength steel, which comprises the following steps of:
1) joint processing: machining a V-shaped groove at the joint, wherein the angle of the groove is 50 degrees;
2) pretreatment: before welding, mechanically treating the surface of the groove to remove rust and expose the metal luster;
3) selecting a welding wire: c: 0.30, Si: 1.55, Mn: 2.00, Ti: 0.36, N: 0.008, P: 0.007, S: 0.002, the balance being Fe and inevitable impurities, the diameter of the welding wire being 1.5mm, and the tensile strength being 900 MPa;
4) welding: adopting a direct-current power supply positive connection method, and using nitrogen as protective gas to carry out welding, wherein the welding process comprises the following steps: the welding current is 300A, the welding voltage is 34V, the welding speed is 10cm/min, and the gas flow is 18L/min; the gas shielded welding adopts multilayer and multi-pass continuous welding, the temperature between welding passes is controlled to be 100-120 ℃, and the welded test plates are I-grade after 100% ultrasonic flaw detection.
The welding process is adopted to weld the mechanical property of the welding joint of the high Ti ultrahigh strength steel, the tensile strength of the welding joint reaches 919MPa, and the Charpy impact energy A at the welding seam area of 40 ℃ below zeroKV79J, fusion line-40 ℃ Charpy impact power AKV83J, heat affected zone 1mm away from fusion line-40 deg.C Charpy impact power AKV89J, and a heat affected zone at 3mm from a fusion line and a Charpy impact power A at-40 DEG CKV93J, heat affected zone 5mm away from fusion line-40 deg.C Charpy impact power AKV97J, heat affected zone 7mm away from fusion line-40 deg.C Charpy impact power AKV98J, heat affected zone 20mm away from fusion line-40 deg.C Charpy impact power AKV＝98J。
The above description is only an embodiment of the present invention, and it should be noted that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.

Claims (3)

1. A special gas shielded welding process for high-Ti and ultrahigh-strength steel is characterized by comprising the following steps of: the method comprises the following steps:
1) joint processing: machining the butt joint part into a V-shaped groove, wherein the angle of the groove is 45-60 degrees;
2) pretreatment: cleaning the surface of the groove before welding to remove rust;
3) selecting a welding wire: the welding wire comprises the following chemical components in percentage by weight: c: 0.10 to 0.30, Si: 0.21 to 1.55, Mn: 2.00-3.50, Ti: 0.36-0.75, N: 0.005-0.008, less than or equal to 0.008P, less than or equal to 0.003S, and the balance Fe and inevitable impurities; the diameter of the welding wire is 1.5mm, and the tensile strength is 900 MPa;
4) welding: adopting a direct current power supply positive connection method, using nitrogen as protective gas to carry out welding, wherein the welding process parameters are as follows: the welding current is 210-239A, the welding voltage is 22-28V, the welding speed is 22-30 cm/min, the flow of protective gas is 8-12L/min, and the temperature between welding passes is controlled to be 150-190 ℃.
2. The special gas shielded welding process for the high-Ti and ultra-high-strength steel as claimed in claim 1, wherein: in the step 1), the angle of the groove is 50-60 degrees.
3. The special gas shielded welding process for the high-Ti and ultra-high-strength steel as claimed in claim 1, wherein: in the step 3), the welding wire comprises the following chemical components in percentage by weight: c: 0.11 to 0.25, Si: 0.85 to 1.34, Mn: 2.10 to 3.42, Ti: 0.38-0.74, N: 0.005-0.006, P is less than or equal to 0.006, S is less than or equal to 0.002, and the balance is Fe and inevitable impurities.
CN201711139388.3A 2017-11-16 2017-11-16 Gas shielded welding process special for high-Ti and ultrahigh-strength steel Active CN107971610B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711139388.3A CN107971610B (en) 2017-11-16 2017-11-16 Gas shielded welding process special for high-Ti and ultrahigh-strength steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711139388.3A CN107971610B (en) 2017-11-16 2017-11-16 Gas shielded welding process special for high-Ti and ultrahigh-strength steel

Publications (2)

Publication Number Publication Date
CN107971610A CN107971610A (en) 2018-05-01
CN107971610B true CN107971610B (en) 2020-04-07

Family

ID=62010276

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711139388.3A Active CN107971610B (en) 2017-11-16 2017-11-16 Gas shielded welding process special for high-Ti and ultrahigh-strength steel

Country Status (1)

Country Link
CN (1) CN107971610B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113787278B (en) * 2021-09-01 2023-03-24 武汉轻工大学 Mixed gas shielded welding process for nitrogen-titanium composite reinforced high-strength steel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61262485A (en) * 1985-05-16 1986-11-20 Kawasaki Steel Corp Wire for submerged arc welding
JPH01150494A (en) * 1987-12-07 1989-06-13 Nippon Steel Corp Solid wire for gas-shielded arc welding
CN1533315A (en) * 2002-01-31 2004-09-29 ������������ʽ���� Steel wire for carbon dioxide shielded arc welding and welding process asing the same
CN1709634A (en) * 2005-06-28 2005-12-21 武汉钢铁(集团)公司 Submerged-arc welding wire for high-strength pipeline steel
CN104999166A (en) * 2015-08-21 2015-10-28 武汉钢铁(集团)公司 Special gas shielded welding technology for 800 MPa grade Ti-containing steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61262485A (en) * 1985-05-16 1986-11-20 Kawasaki Steel Corp Wire for submerged arc welding
JPH01150494A (en) * 1987-12-07 1989-06-13 Nippon Steel Corp Solid wire for gas-shielded arc welding
CN1533315A (en) * 2002-01-31 2004-09-29 ������������ʽ���� Steel wire for carbon dioxide shielded arc welding and welding process asing the same
CN1709634A (en) * 2005-06-28 2005-12-21 武汉钢铁(集团)公司 Submerged-arc welding wire for high-strength pipeline steel
CN104999166A (en) * 2015-08-21 2015-10-28 武汉钢铁(集团)公司 Special gas shielded welding technology for 800 MPa grade Ti-containing steel

Also Published As

Publication number Publication date
CN107971610A (en) 2018-05-01

Similar Documents

Publication Publication Date Title
JP7343603B2 (en) Welded parts made of steel with aluminum or aluminum alloy plating layer that have different strengths and their manufacturing method
CN106270957B (en) A kind of gas-shield welding method of the high-strength steel thick plate of 1000MPa grades of engineering machinery
CN100413629C (en) Process for welding 800MPa high-strength steel without preheating
CN109226941B (en) GMAW (gas metal arc welding) method for low-alloy ultrahigh-strength steel Q1100E thin plate
CN102513662B (en) Q690 and Q980 high-strength dissimilar steel non-preheating welding method
CN103231155B (en) Easy-welding high-strength large-thickness steel plate preheating-free gas shielded welding process
CN111230264B (en) Welding method for MIG welding of 304L austenitic stainless steel
CN104999166B (en) 800MPa level steel containing Ti special gas protect welding procedure
AU2019448393B2 (en) Method for enhancing strength and toughness of welded joint formed on Q890DQP steel
CN103862184A (en) Non-preheating combined welding method for 1000MPa high-strength steel
CN101508053A (en) Welding method of high-nickel alloy and stainless steel dissimilar metal
CN110076430B (en) Gas shielded welding method for 1000MPa steel plate with thickness of more than or equal to 40mm
WO2014035013A1 (en) Method for laser welding and welded metal using the same
CN101532121B (en) Technology for processing metal surface by arc spray melting
CN107971610B (en) Gas shielded welding process special for high-Ti and ultrahigh-strength steel
CN110871312B (en) MAG welding method of low-alloy steel plate with yield strength of 600MPa
CN114131159A (en) Welding method of ultrahigh-strength steel Q1300E steel plate
CN108907505B (en) Special welding wire for Q550MPa high-strength steel and preparation method thereof
CN102248324A (en) CO2 gas shield welding wire capable of reducing welding spatter
CN108274100A (en) The welding method of oil cylinder of hydraulic support stainless joint seat
CN203778936U (en) Device for welding high-nitrogen austenite stainless steel medium plate
CN111230255A (en) Welding method for improving low-temperature toughness of 304L austenitic stainless steel welding joint
CN106425020A (en) Welding base plate and application of welding base plate to magnesium/aluminum dissimilar metal welding
CN104907674A (en) Welding method and device of high-nitrogen austenitic stainless steel medium plate
CN111761175A (en) Efficient gas-slag combined shielded welding method for thick plates

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant