阅读说明：本技术 一种Mn13高锰钢的焊接工艺 (Welding process of Mn13 high-manganese steel ) 是由 屈朝霞 夏立乾 王小杰 朱双春 于 2018-06-27 设计创作，主要内容包括：一种Mn13高锰钢的焊接工艺,包括如下步骤：1)将对接板材加工合理的焊接坡口；2)过渡层焊接,采用直流反接极性,焊接方式SMAW,焊接电流110～130A,电弧电压35～45V,焊接速度150～250mm/min,冷却方式,空冷,层道温度≤50℃；每焊完50～100mm长的焊缝后,马上水冷并锤击,测量母材距离坡口10～20mm位置温度,冷却到50℃以下,对表面进行清理后再继续焊接；过渡层厚度4～6mm；3)填充焊缝的焊接,采用富氩气体保护焊焊接,焊接材料使用低合金钢焊丝；焊接电流220～260A,电弧电压28～31V,焊接速度400～450mm/min,冷却方式,空冷,层道温度≤150℃；完成一道后空冷至150℃以下,再进行下一道次焊接。(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.)

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.

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.