CN110640349A - Welding process of Mn13 high-manganese steel - Google Patents

Welding process of Mn13 high-manganese steel Download PDF

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Publication number
CN110640349A
CN110640349A CN201810680792.XA CN201810680792A CN110640349A CN 110640349 A CN110640349 A CN 110640349A CN 201810680792 A CN201810680792 A CN 201810680792A CN 110640349 A CN110640349 A CN 110640349A
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welding
cooling
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equal
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屈朝霞
夏立乾
王小杰
朱双春
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/30Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/30Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053Fe as the principal constituent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/30Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053Fe as the principal constituent
    • B23K35/308Fe as the principal constituent with Cr as next major constituent
    • B23K35/3086Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/095Monitoring or automatic control of welding parameters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/235Preliminary treatment

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

Abstract

A welding process of Mn13 high manganese steel comprises the following steps: 1) processing a reasonable welding groove on the butt joint plate; 2) welding a transition layer, namely adopting direct-current reverse polarity, adopting a welding mode SMAW, welding current of 110-130A, arc voltage of 35-45V, welding speed of 150-250 mm/min, adopting a cooling mode, and carrying out air cooling, wherein the temperature of a layer channel is less than or equal to 50 ℃; immediately cooling and hammering after welding a welding seam with the length of 50-100 mm, measuring the temperature of a base metal at a position 10-20 mm away from the groove, cooling to below 50 ℃, cleaning the surface and then continuing welding; the thickness of the transition layer is 4-6 mm; 3) welding the filling welding seam by adopting argon-rich gas shielded welding, wherein a low alloy steel welding wire is used as a welding material; welding current is 220-260A, arc voltage is 28-31V, welding speed is 400-450 mm/min, cooling is carried out in a cooling mode, and the temperature of a tunnel is less than or equal to 150 ℃; after one pass, air cooling is carried out to below 150 ℃, and then the next pass of welding is carried out.

Description

Welding process of Mn13 high-manganese steel
Technical Field
The invention relates to a steel welding technology, in particular to a welding process of Mn13 high manganese steel.
Background
Mn13 steel was a wear resistant steel invented by hadfield, england in 1882. The carbon content of the steel is higher, generally 0.90-1.30%, 11.0-14.0% of Mn, 0.10-0.50% of Si, and less than or equal to 0.35% of S and P. The steel is an austenite structure, and when the steel is subjected to an impact load, the metal surface is subjected to plastic deformation, and the result shows that the steel has an obvious work hardening phenomenon in a deformation layer along with the great increase of dislocation density, and the hardness of the surface layer is greatly improved. The Mn13 steel itself has poor weldability. The most important problem of the welding of Mn13 steel is the precipitation of carbide in the heat affected zone, thereby causing the generation of hot cracks and causing the damage of the welded joint.
Chinese patent publication No. CN1439481A discloses a high manganese steel welding electrode and a welding method thereof, wherein the coating of the electrode comprises the following components in percentage by weight: 20-25% of marble, 15-18% of fluorite, 4-5% of quartz, 2-4% of titanium dioxide, 2-5% of ferrosilicon, 30-35% of manganese metal and 20-25% of chromium metal, and the core wire is low-carbon high-quality steel H08A. And the welding of the high manganese steel is required to adopt a small-specification welding rod, a small current, short arc welding and linear rapid strip conveying without strip swinging, and the welding process adopts air cooling or water cooling and forced cooling after welding.
Chinese patent publication No. CN1442265A discloses a welding process method of a high-carbon steel rail and a high-manganese steel frog, which adopts a manual arc welding method to weld a Cr-Ni-Mo alloy transition layer on the side of the rail, weld a Mn-Cr-Ni alloy transition layer on the side of the frog and carry out solution treatment, and then symmetrically weld double U-shaped groove joints of the rail and the frog.
Chinese patent publication No. CN105312744A discloses a gas metal arc welding process for medium manganese wear-resistant steel and 30MnSi ledge steel, which obtains a good welding joint by optimizing welding current, welding voltage, welding speed and inter-lane temperature and selecting proper shielding gas and gas flow, wherein the tensile strength of the joint is more than or equal to 725MPa, the room-temperature impact Akv is more than or equal to 120J, and the bending angle of a bending core with the diameter of 144mm is 180 degrees and is qualified. The welding wire comprises the following chemical components: 0.05-0.12% of C, 6.00-8.00% of Mn, less than or equal to 0.025% of P, less than or equal to 0.02% of S and 0.30-0% of Si.80 percent of Ni, 6.00 to 9.00 percent of Ni, 17.00 to 19.00 percent of Cr, less than or equal to 0.20 percent of Cu, less than or equal to 0.20 percent of Mo and less than or equal to 0.10 percent of N, and the used protective gas is Ar +2.5 percent of CO2And (4) mixing the gases.
The technical solutions disclosed in the above patent documents show that when welding medium and high manganese steels, in order to obtain good weld joint performance, it is necessary to strictly control the welding process, even to adopt a forced cooling process, and to use the welding material with high Ni and Cr contents in combination with high alloy.
Disclosure of Invention
The invention aims to provide a welding process of Mn13 high manganese steel, which can obtain good welding joint performance and solve the problems of expensive welding materials, strict welding process requirements and low welding efficiency in the conventional high manganese steel welding.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a welding process of Mn13 high manganese steel comprises the following steps:
1) processing a reasonable welding groove on the butt-jointed plates, polishing the groove and the two sides within 30mm before welding to expose metallic luster, and cleaning oil stains and rust stains on the surfaces;
2) welding of transition layers
The manual electric arc welding method is adopted, the welding material uses a stainless steel welding rod, and deposited metal comprises the following chemical components: less than or equal to 0.10 percent of C, 6.00 to 9.00 percent of Mn, less than or equal to 0.70 percent of Si, 18.0 to 22.0 percent of Cr, 9.0 to 11.0 percent of Ni, less than or equal to 0.030 percent of S, and less than or equal to 0.035 percent of P;
the welding of the transition layer adopts direct current reverse polarity, welding mode SMAW and welding current
110-130A, 35-45V of arc voltage, 150-250 mm/min of welding speed, cooling mode and air cooling, wherein the temperature of a tunnel is less than or equal to 50 ℃; after welding a welding seam with the length of 50-100 mm, immediately cooling by water and hammering, wherein the cooling water is concentrated to be poured on the side close to a welding seam base metal, meanwhile, repeatedly and rapidly hammering the welding seam, measuring the temperature of the base metal at a position 10-20 mm away from a groove, cooling to below 50 ℃, cleaning the surface, and then continuing welding; the thickness of the transition layer is 4-6 mm;
3) welding of filler welds
The argon-rich gas shielded welding method is adopted, the welding material is a low alloy steel welding wire, the tensile strength of deposited metal is not less than 590MPa, and the shielding gas is 80-85% of Ar + 15-20% of CO2(ii) a The welding mode is GMAW, the welding current is 220-260A, the arc voltage is 28-31V, the welding speed is 400-450 mm/min, the cooling mode is air cooling, and the temperature of a tunnel is less than or equal to 150 ℃; after one pass, air cooling is carried out to below 150 ℃, and then the next pass of welding is carried out.
Preferably, the welding groove is a single-side V-shaped groove or a double-V-shaped groove.
When the high manganese steel Mn13 is welded, the high alloy welding material with high Cr and Ni contents is not completely used, so that the use cost of the welding material is reduced; a gas shielded welding method is introduced, so that the automation degree and the welding efficiency are greatly improved. The welding seam is divided into a transition layer and a filling layer, and the welding of the joint is completed by adopting different welding methods and welding materials, so that the performance of the joint is ensured and the economy is considered at the same time.
By adopting the welding process, the carbon precipitation in the heat affected zone of the welding joint can be effectively controlled, and the generation of cracks and the performance weakening are avoided.
In the prior art, when high manganese steel Mn13 is welded, the whole welding seam is made of stainless steel welding materials, the welding seam is divided into a transition part and a filling part for welding, the stainless steel welding materials are used in the transition layer, and the low alloy steel welding materials are used in the filling welding seam. By adding the transition layer and regulating the thickness of the transition layer, the problem of poor performance of the low alloy steel welding material filling weld joint caused by element diffusion is avoided. The performance of the whole welding line is ensured, and the cost of welding materials is lower.
Conventionally, when welding high manganese steel Mn13, forced cooling is required for each weld in order to avoid excessive precipitation of carbides in the heat affected zone, and the welding process is extremely complicated. According to the invention, the adverse effect of secondary heating on a heat affected zone in the filling weld joint welding process is controlled within an acceptable range through the isolation of a transition layer with a certain thickness and the limitation of welding parameters and interlayer temperature. In the example shown in FIG. 4, it can be seen that the precipitation of carbides in the heat affected zone of the final welded joint is not significant. And by adopting a consumable electrode gas shielded welding method, each water cooling process for filling the welding line is omitted, and the welding efficiency is greatly improved.
The high manganese steel butt joint obtained by the welding process provided by the invention has good tensile, bending and impact properties, and meets the evaluation requirements of the welding joint.
Drawings
FIG. 1 is a schematic view of a weld joint according to an embodiment of the present invention; in the figure, 1-base metal, 2-transition layer, 3-filling weld;
FIG. 2 is a macro view of a weld joint according to an embodiment of the present invention;
FIG. 3 is a graph of weld joint hardness profiles according to an embodiment of the present invention;
FIG. 4 shows the metallographic phase (400X) of the weld joint weld zone and the superheat zone in accordance with an embodiment of the invention.
Detailed Description
The Mn13 welding method for high manganese steel according to the present invention will be further explained with reference to the following specific examples, which are not to be construed as unduly limiting the technical scope of the present invention. All modifications directly derivable or suggested from the present disclosure are within the scope of the invention.
Referring to fig. 1, the welding process of the Mn13 high manganese steel of the invention comprises the following steps:
1) processing a reasonable welding groove on the butt-jointed plates, polishing the groove and the two sides within 30mm before welding to expose metallic luster, and cleaning oil stains and rust stains on the surfaces;
2) welding of transition layers
The manual electric arc welding method is adopted, the welding material uses a stainless steel welding rod, and deposited metal comprises the following chemical components: less than or equal to 0.10 percent of C, 6.00 to 9.00 percent of Mn, less than or equal to 0.70 percent of Si, 18.0 to 22.0 percent of Cr, 9.0 to 11.0 percent of Ni, less than or equal to 0.030 percent of S, and less than or equal to 0.035 percent of P;
when the transition layer is welded, the direct current reverse polarity is adopted, the welding mode SMAW is adopted, the welding current is 110-130A, the arc voltage is 35-45V, the welding speed is 150-250 mm/min, the cooling mode is adopted, air cooling is carried out, and the temperature of a layer channel is less than or equal to 50 ℃; after welding a welding seam with the length of 50-100 mm, immediately cooling by water and hammering, wherein the cooling water is concentrated to be poured on the side close to a welding seam base metal, meanwhile, repeatedly and rapidly hammering the welding seam, measuring the temperature of the base metal at a position 10-20 mm away from a groove, cooling to below 50 ℃, cleaning the surface, and then continuing welding; the thickness of the transition layer is 4-6 mm;
3) welding of filler welds
The argon-rich gas shielded welding method is adopted, the welding material is a low alloy steel welding wire, the tensile strength of deposited metal is not less than 590MPa, and the shielding gas is 80-85% of Ar + 15-20% of CO2(ii) a The welding mode is GMAW, the welding current is 220-260A, the arc voltage is 28-31V, the welding speed is 400-450 mm/min, the cooling mode is air cooling, and the temperature of a tunnel is less than or equal to 150 ℃; after one pass, air cooling is carried out to below 150 ℃, and then the next pass of welding is carried out.
Examples
For an example of butt welding of Mn13 steel plates with the thickness of 20mm, a 60-degree V-shaped welding groove is processed, and a schematic diagram of a joint is shown in FIG. 1.
And (3) carrying out transition layer manual electric arc welding by using a stainless steel welding rod with the specification of phi 4.0mm, and carrying out water cooling and hammering on a welding area in time. Argon-rich gas shielded welding of a filler weld was carried out using 60kg strength grade low alloy steel welding wire of 1.2mm specification, using 80% Ar + 20% CO2As protective gas, the gas flow is 20L/min, and the walking trolley is used for realizing automatic welding. Specific welding parameters are shown in table 1.
TABLE 1 welding Process parameters
Figure BDA0001710302940000051
The macroscopic photograph of the cross section of the welded joint (see fig. 2) shows that the joint is well fused, and welding defects such as cracks, pores, slag inclusion and the like are not seen.
And (3) detecting the hardness distribution of the welding joint according to a standard GB/T2654-2008 'welding joint hardness test method', and obtaining Brinell hardness values of the filling welding seam, the transition layer, the fusion zone, the heat affected zone and each area of the base metal, wherein the Brinell hardness values are shown in figure 3.
The impact performance of the welded joint was tested according to the standard GB/T2650-2008 "welded joint impact test method", and the results are shown in Table 2.
TABLE 2 weld joint impact properties
Figure BDA0001710302940000052
The tensile properties of the welded joints were measured according to the standard GB/T2651-2008 "tensile test method for welded joints", and the results are shown in Table 3.
TABLE 3 tensile Properties of weld joints
Size of tested part/mm Tensile strength/MPa Location of fracture
20×25 725 Heat affected zone
The bending properties of the welded joint were measured according to the standard GB/T2653-2008 "method for testing the bending of welded joints", and the results are shown in Table 4.
TABLE 4 weld joint cornering performance
Sample size/mm In the form of a bend Indenter diameter/mm Bending angle Bending result
20×10 Lateral bending 60 180° Qualified
20×10 Lateral bending 60 180° Qualified
20×10 Lateral bending 60 180° Qualified
20×10 Lateral bending 60 180° Qualified
Particularly, when microscopic metallographic analysis is performed on the positions of a fusion zone and a superheat zone of a weak point of a welded joint (see fig. 4), supersaturated carbon is precipitated in the form of carbide at a grain boundary, and compared with the precipitation of the grain boundary of a parent metal, the precipitation of the grain boundary is not obviously increased, and the weakening of the grain boundary is not obvious.
The high manganese steel Mn13 welding process well inhibits the weakening of joint performance caused by the precipitation of carbide in a heat affected zone. Only when the transition layer is welded, the stainless steel welding material with higher alloy content is used, and water cooling along with welding is assisted. And the filling welding line with large workload adopts more efficient gas shielded welding, uses conventional low alloy steel welding materials, does not need special cooling treatment, greatly improves the welding efficiency and saves the cost.
It is to be noted that the above lists only specific embodiments of the present invention, and it is obvious that the present invention is not limited to the above embodiments, and many similar variations follow. All modifications which would occur to one skilled in the art and which are, therefore, directly derived or suggested from the disclosure herein are deemed to be within the scope of the present invention.

Claims (2)

1. A welding process of Mn13 high manganese steel is characterized by comprising the following steps:
1) processing a reasonable welding groove on the butt-jointed plates, polishing the groove and the two sides within at least 30mm before welding to expose metallic luster, and cleaning oil stains and rust stains on the surfaces;
2) welding of transition layers
The manual electric arc welding method is adopted, the welding material uses a stainless steel welding rod, and deposited metal of the welding material comprises the following main chemical components: less than or equal to 0.10 percent of C, 6.00 to 9.00 percent of Mn, less than or equal to 0.70 percent of Si, 18.0 to 22.0 percent of Cr, 9.0 to 11.0 percent of Ni, less than or equal to 0.030 percent of S, and less than or equal to 0.035 percent of P;
when the transition layer is welded, the direct current reverse polarity is adopted, the welding mode SMAW is adopted, the welding current is 110-130A, the arc voltage is 35-45V, the welding speed is 150-250 mm/min, the cooling mode is adopted, air cooling is carried out, and the temperature of a layer channel is less than or equal to 50 ℃; after welding a welding seam with the length of 50-100 mm, immediately cooling by water and hammering, wherein the cooling water is concentrated to be poured on the side close to a welding seam base metal, meanwhile, repeatedly and rapidly hammering the welding seam, measuring the temperature of the base metal at a position 10-20 mm away from a groove, cooling to below 50 ℃, cleaning the surface, and then continuing welding; the thickness of the transition layer is 4-6 mm;
3) welding of filler welds
The argon-rich gas shielded welding method is adopted, the welding material is a low alloy steel welding wire, the tensile strength of deposited metal is not less than 590MPa, and the shielding gas is 80-85% of Ar + 15-20% of CO2(ii) a Welding mode GMAW, welding current is 220-260A, arc voltage is 28-31V, welding speed is 400-450 mm/min, cooling is carried out in a cooling mode, the temperature of a layer channel is less than or equal to 150 ℃, and finally the weld reinforcement is not more than 3 mm.
2. The welding process of Mn13 high manganese steel according to claim 1, wherein the welding groove is a single V groove or a double V groove.
CN201810680792.XA 2018-06-27 2018-06-27 Welding process of Mn13 high-manganese steel Pending CN110640349A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111590237A (en) * 2020-05-26 2020-08-28 南京钢铁股份有限公司 Arc welding electrode for ultralow-temperature high-manganese steel and preparation method thereof
US20220281038A1 (en) * 2019-11-26 2022-09-08 Esab Seah Corp. Stainless steel welding wire for use in lng tank manufacturing
CN115070169A (en) * 2022-07-07 2022-09-20 南京钢铁股份有限公司 Steel plate welding method for 7% Ni storage tank steel
CN115781101A (en) * 2022-11-09 2023-03-14 抚顺特殊钢股份有限公司 Repair process for weld cracks of box body of sand blasting machine

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220281038A1 (en) * 2019-11-26 2022-09-08 Esab Seah Corp. Stainless steel welding wire for use in lng tank manufacturing
CN111590237A (en) * 2020-05-26 2020-08-28 南京钢铁股份有限公司 Arc welding electrode for ultralow-temperature high-manganese steel and preparation method thereof
CN115070169A (en) * 2022-07-07 2022-09-20 南京钢铁股份有限公司 Steel plate welding method for 7% Ni storage tank steel
CN115070169B (en) * 2022-07-07 2023-08-15 南京钢铁股份有限公司 Steel plate welding method for 7% Ni storage tank steel
CN115781101A (en) * 2022-11-09 2023-03-14 抚顺特殊钢股份有限公司 Repair process for weld cracks of box body of sand blasting machine
CN115781101B (en) * 2022-11-09 2024-09-24 抚顺特殊钢股份有限公司 Sand blasting machine box weld crack repairing process

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Application publication date: 20200103