CN115446497A - Rare earth treated NM500 wear-resistant steel welding method - Google Patents
Rare earth treated NM500 wear-resistant steel welding method Download PDFInfo
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- CN115446497A CN115446497A CN202211275791.XA CN202211275791A CN115446497A CN 115446497 A CN115446497 A CN 115446497A CN 202211275791 A CN202211275791 A CN 202211275791A CN 115446497 A CN115446497 A CN 115446497A
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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
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
Abstract
The invention discloses a rare earth treated NM500 wear resistant steel welding method, adopting rare earth Ce treated NM500 wear resistant steel to carry out flat plate butt welding, adopting JM-100C welding wire and 80% Ar +20% in the welding process 2 The mixed gas is subjected to multilayer multi-pass welding, the preheating temperature before welding is not lower than 180 ℃, the temperature between passes is 180-200 ℃, and the welding heat input is controlled to be 10.0-15.5KJ/cm. The addition of a proper amount of rare earth Ce in the steel can play a role in refining weld joint tissues, so that the toughness of the weld joint is improved, and the welded joint is ensured to have high strength and excellent toughness. And the welding process is simple, the welding efficiency is high, and the method can be well popularized and applied in the industry.
Description
Technical Field
The invention relates to the field of wear-resistant steel, in particular to a rare earth treated NM500 wear-resistant steel welding method.
Background
The wear-resistant steel has high strength, high hardness and high wear resistance, is widely applied to wear-resistant parts of mines and various engineering machinery, and most wear-resistant steels need to be welded and formed in the using process, so the welding formability of the wear-resistant steel also becomes the key point of attention of users, and when the wear-resistant steel is welded, the safety and the reliability of the structure are ensured, and meanwhile, the comprehensive performance of a welding joint is required to meet the design requirement.
The high-grade wear-resistant steel has high carbon and alloy contents, large carbon equivalent, high quenching tendency and cold crack sensitivity, easily forms martensite structure in a welding heat affected zone, and has low toughness, so that the service life of wear-resistant steel parts is shortened. In actual welding, in order to prevent the generation of welding cold cracks, processes such as pre-welding preheating, post-welding heat preservation and the like are generally adopted to ensure the safe reliability of a welding part, meanwhile, in order to avoid weld cracks and the toughness of a welding seam, most of welding materials adopt low-strength matching to improve the toughness, so that the metal strength of the welding seam is low, the welding seam is difficult to achieve high-strength matching with a base metal and the like, and the wear resistance and the service life of the welding seam are poor.
Patent CN 102632320B discloses a carbon dioxide gas shielded welding method for high-grade wear-resistant steel, which adopts a high-grade wear-resistant steel plate with hardness grade HB500, adopts carbon dioxide gas shielded gas in the welding process, and selects a welding wire with strength grade 500MPa to ensure the toughness of a joint, so that the strong hardness of the welded weld is low, and the wear resistance is poor. Patent CN 104227180B discloses a welding method of NM400 wear-resistant steel, firstly adopting an A407 stainless steel welding rod as a backing weld, then using an ER506 welding wire to carry out multilayer multi-pass welding, then selecting the A407 welding rod to weld a transition layer, and finally using a D212 welding rod to carry out capping, wherein the whole welding process adopts three welding materials and various welding methods, and the welding process needs to be preheated at 350-400 ℃, is complex in welding process and is difficult to popularize and implement.
Disclosure of Invention
The purpose of the invention is to provideA method of welding NM500 wear resistant steel, for a rare earth treatment, the welding method employing 80% Ar +20% 2 The mixed gas and the JM-100C welding wire are welded, the mixed gas is preheated before welding, cracks are avoided, the rare earth Ce in the base metal after welding plays a role in refining the weld joint structure, and the welded joint is guaranteed to have high strength and excellent toughness.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a welding method of rare earth treated NM500 wear-resistant steel, which comprises the following steps:
before welding, polishing the wear-resistant steel plate, and removing rust and oil stains within a range of 20mm around the weld; the bevel adopts a symmetrical double-sided X-shaped bevel, the angle of the single-sided bevel is 30 degrees, the truncated edge is 2mm, and the gap of the bevel is 1-2mm;
preheating a steel plate before welding, wherein the preheating temperature is not lower than 180 ℃, the inter-channel temperature is 180-200 ℃, the welding current is controlled at 230-280A, the welding voltage is controlled at 20-30V, the welding speed is controlled at 300-360mm/min, and the welding heat input is controlled at 10.0-15.5KJ/cm;
and carrying out nondestructive testing on the welding seam after welding, and sampling and comprehensively testing the mechanical property of the welding seam metal of the joint after the welding seam metal is qualified, wherein the welding seam metal impact notch is arranged in the center of the welding seam, and the heat affected zone impact notch is arranged at a position 1mm outside the fusion line.
Further, the rare earth Ce treated NM500 wear resistant steel plate has a Ce content of 0.0005-0.0020% and a thickness of 15-40mm, and is butt welded in combination with the same plate thickness.
Further, welding is performed using 80% Ar +20% CO2 mixed gas and JM-100C welding wire.
Further, the JM-100C welding wire comprises the following chemical components in percentage by weight: less than or equal to 0.16%, si:0.40-0.80%, mn:1.30-1.80%, P: less than or equal to 0.015%, S: less than or equal to 0.005%, mo:0.20-0.55%, ni:1.5-2.0%, and the balance of Fe and inevitable impurities.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention adopts the NM500 wear-resistant steel plate treated by rare earth Ce, and proper amount of rare earth is added into the steelCan play the roles of purifying molten steel, deteriorating inclusion and refining tissues. Welding process with JM-100C welding wire and 80% Ar +20% CO 2 The preheating temperature before welding is not lower than 180 ℃ in mixed gas shielded welding, welding cold cracks are prevented from being generated, the rare earth in the base metal can refine the welding seam structure, the toughness of the welding seam is improved, and the welding joint is guaranteed to have high strength and excellent toughness. The welding process is simple, the welding efficiency is high, and the method can be well popularized and applied in the industry.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
Fig. 1 is a schematic diagram of a groove form and a weld bead arrangement of an NM500 wear-resistant steel plate joint.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Examples 1 to 3 are the process steps adopted in the rare earth treated NM500 wear resistant steel welding method of the present invention.
The welding process parameters for each example and comparative example are shown in table 1; the mechanical properties of the resulting weld joint are shown in Table 2.
TABLE 1 welding Process parameters
TABLE 2 weld joint Properties
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (4)
1. A welding method of rare earth treated NM500 wear-resistant steel is characterized by comprising the following steps: the method comprises the following steps:
before welding, polishing the wear-resistant steel plate, and removing rust and oil stains within a range of 20mm around the weld; the bevel adopts a symmetrical double-sided X-shaped bevel, the angle of the single-sided bevel is 30 degrees, the truncated edge is 2mm, and the gap of the bevel is 1-2mm;
preheating a steel plate before welding, wherein the preheating temperature is not lower than 180 ℃, the inter-channel temperature is 180-200 ℃, the welding current is controlled at 230-280A, the welding voltage is controlled at 20-30V, the welding speed is controlled at 300-360mm/min, and the welding heat input is controlled at 10.0-15.5KJ/cm;
and carrying out nondestructive testing on the welding seam after welding, sampling and comprehensively testing the mechanical property of the welding seam metal of the joint after the welding seam is qualified, wherein a welding seam metal impact notch is formed in the center of the welding seam, and an impact notch of a heat affected zone is formed at a position 1mm out of the fusion line.
2. The rare earth treated NM500 wear resistant steel welding method of claim 1, characterized in that: the rare earth Ce treated NM500 wear-resistant steel plate has Ce content of 0.0005-0.0020% and thickness of 15-40mm, and is butt welded in the same plate thickness combination.
3. The rare earth treated NM500 wear resistant steel welding method of claim 2, characterized in that: employing 80% Ar +20% of 2 And welding the mixed gas and a JM-100C welding wire.
4. The rare earth treated NM500 wear resistant steel welding method of claim 3, characterized in that: the JM-100C welding wire comprises the following chemical components in percentage by weight: less than or equal to 0.16 percent, si:0.40-0.80%, mn:1.30-1.80%, P: less than or equal to 0.015%, S: less than or equal to 0.005%, mo:0.20-0.55%, ni:1.5-2.0%, and the balance of Fe and inevitable impurities.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211275791.XA CN115446497A (en) | 2022-10-18 | 2022-10-18 | Rare earth treated NM500 wear-resistant steel welding method |
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| CN202211275791.XA CN115446497A (en) | 2022-10-18 | 2022-10-18 | Rare earth treated NM500 wear-resistant steel welding method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775539A (en) * | 2009-01-14 | 2010-07-14 | 宝山钢铁股份有限公司 | High-flexibility wear-resistant steel plate and manufacturing method thereof |
| CN102049597A (en) * | 2011-01-07 | 2011-05-11 | 南京钢铁股份有限公司 | Argon-enriched mixed gas protection welding method for high-strength abrasion-resistant steel |
| CN108546873A (en) * | 2018-04-17 | 2018-09-18 | 包头钢铁（集团）有限责任公司 | The manufacturing method of high-wearing feature steel plate and high-wearing feature steel plate |
| CN111676418A (en) * | 2020-05-08 | 2020-09-18 | 包头钢铁（集团）有限责任公司 | Rare earth treated HB500 grade high-wear-resistance steel plate and production method thereof |
| CN114178664A (en) * | 2021-12-10 | 2022-03-15 | 包头钢铁（集团）有限责任公司 | Argon-rich mixed gas shielded welding method for NM450 high-strength wear-resistant steel |
| WO2022054492A1 (en) * | 2020-09-10 | 2022-03-17 | Ｊｆｅスチール株式会社 | Welding joint and method of producing welding joint |
| JP2022061854A (en) * | 2020-10-07 | 2022-04-19 | 日本製鉄株式会社 | Method for manufacturing welded joint |
-
2022
- 2022-10-18 CN CN202211275791.XA patent/CN115446497A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775539A (en) * | 2009-01-14 | 2010-07-14 | 宝山钢铁股份有限公司 | High-flexibility wear-resistant steel plate and manufacturing method thereof |
| CN102049597A (en) * | 2011-01-07 | 2011-05-11 | 南京钢铁股份有限公司 | Argon-enriched mixed gas protection welding method for high-strength abrasion-resistant steel |
| CN108546873A (en) * | 2018-04-17 | 2018-09-18 | 包头钢铁（集团）有限责任公司 | The manufacturing method of high-wearing feature steel plate and high-wearing feature steel plate |
| CN111676418A (en) * | 2020-05-08 | 2020-09-18 | 包头钢铁（集团）有限责任公司 | Rare earth treated HB500 grade high-wear-resistance steel plate and production method thereof |
| WO2022054492A1 (en) * | 2020-09-10 | 2022-03-17 | Ｊｆｅスチール株式会社 | Welding joint and method of producing welding joint |
| JP2022061854A (en) * | 2020-10-07 | 2022-04-19 | 日本製鉄株式会社 | Method for manufacturing welded joint |
| CN114178664A (en) * | 2021-12-10 | 2022-03-15 | 包头钢铁（集团）有限责任公司 | Argon-rich mixed gas shielded welding method for NM450 high-strength wear-resistant steel |
Non-Patent Citations (1)
| Title |
|---|
| 刘丽敏等: "吉帕级低合金高强度推土机刀板用钢NM400焊接性能研究", 河北冶金, no. 2020, pages 27 - 30 * |
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