CN111001907A - 一种超低碳马氏体高强韧熔化极气体保护焊用焊丝 - Google Patents
一种超低碳马氏体高强韧熔化极气体保护焊用焊丝 Download PDFInfo
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- CN111001907A CN111001907A CN201911230847.8A CN201911230847A CN111001907A CN 111001907 A CN111001907 A CN 111001907A CN 201911230847 A CN201911230847 A CN 201911230847A CN 111001907 A CN111001907 A CN 111001907A
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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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
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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
- B23K35/3033—Ni 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- 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
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Abstract
本发明提出的是一种超低碳马氏体高强韧熔化极气体保护焊用焊丝。焊丝由主合金元素、纳米相形成元素和杂质元素组成。一种超低碳马氏体高强韧熔化极气体保护焊用焊丝,通过纳米相实现了焊缝金属在较低碳含量和合金元素含量的范围内的高强度和高韧性。成功将碳当量降低至安全范围内,有效的克服了冷裂纹产生、保证焊接接头质量。该方法实现了低含碳量条件下焊缝金属的高强度和高韧性,降低了焊缝金属的碳当量,提高了焊缝金属的抗冷裂纹能力,能够为大厚板不预热不后热焊接提供材料支撑。适宜作为保护焊焊丝使用。
Description
技术领域
本发明提出的是焊接技术领域的一种超低碳马氏体高强韧熔化极气体保护焊用焊丝。
背景技术
随着科学技术的发展,钢结构越发向高承载、复杂结构发展。焊接难度越来越大,尤其以冷裂纹、强度不稳定、冲击韧性不足等尤为严重。对产品的使用和结构带来了巨大的安全隐患。目前现有焊接材料,随着强度增高,其碳含量和合金元素也随着增高,造成碳含量和碳当量过高,裂纹倾向明显。近年来发展起来的纳米强韧化技术已经在许多工程领域得到应用,其特点是可以在较低碳含量和合金元素含量的范围内,通过纳米强韧化实现基体的高强度和高韧性。基于此,如何将纳米强韧化技术应用到高强钢焊接材料,获得低碳含量、高强韧的焊接接头已经成为克服冷裂纹、保证焊接接头质量的重要研究方向。
发明内容
本发明所提供的一种一种超低碳马氏体高强韧熔化极气体保护焊用焊丝是:以800MPa级别Ni-Cr-Mo低合金焊丝为基础,通过降低碳含量,增加镍元素含量,形成侧板条马氏体保证焊缝金属的基本强度,通过Cu、Ti、Zr、V微合金元素在焊缝凝固过程中形成纳米级别的氧化物和复杂化合物,进一步确保了焊缝金属的强度和提升了低温冲击韧性,解决保护焊焊丝制备的技术问题。
本发明解决技术问题所采用的方案是:
焊丝由主合金元素、纳米相形成元素和杂质元素组成。
积极效果:本发明通过纳米相实现了焊缝金属在较低碳含量和合金元素含量的范围内的高强度和高韧性。成功将碳当量降低至安全范围内,有效的克服了冷裂纹产生、保证焊接接头质量。该方法实现了低含碳量条件下焊缝金属的高强度和高韧性,降低了焊缝金属的碳当量,提高了焊缝金属的抗冷裂纹能力,能够为大厚板不预热不后热焊接提供材料支撑。适宜作为一种超低碳马氏体高强韧熔化极气体保护焊用焊丝应用。
具体实施方式
按照焊丝化学成分,进行焊丝的熔炼和拉丝,所制成的焊丝直径1.2mm,化学成分如下:
(1)主合金元素(wt%):C:0.032;Si:0.5;Mn:1.3;Cr:0.48;Mo:0.75;Ni:4.5;
(2)纳米相形成元素(wt%):Ti:0.015-0.045;Cu:0.035-0.055; Zr:0.01-0.025:V:0.01-0.025;
(3)杂质元素(wt%):Al:<0.05;S:≤0.01;P:≤0.01;O:≤0.005;N:≤0.005;
其中碳元素C(wt%):0.03-0.05;
镍元素Ni(wt%):4-4.5;
纳米相形成元素(wt%):Ti:0.015-0.045;Cu:0.035-0.055;Zr:0.01-0.025:V:0.01-0.025。
将主合金元素、纳米相形成元素和杂质元素与碳元素和镍元素混合后通过熔化过程熔化为金属液体,通过拉丝制成焊丝。
焊接工艺:
进行了熔敷金属试板的焊接,焊接工艺如下:
由焊工采用脉冲直流MAG焊接设备;
保护气体:95%Ar+5%CO2
道间温度为100℃~150℃。
焊接结束后,进行了常规力学性能试验,试验结果如下:
Rp0.2=814MPa,A=16.5%,Z=60%,-50℃焊缝的冲击功为102J
金相观察焊缝金属组织为板条状马氏体组织。
三维原子探针对纳米化合物检测,能够发现大量的纳米化合物。
特点:
用主合金元素,纳米相形成元素和杂质元素制成合金焊丝,用于保护焊焊丝使用,达到优质效果,而且实用性强。
Claims (2)
1.一种超低碳马氏体高强韧熔化极气体保护焊用焊丝,其特征是:
焊丝组成成分:
(1)主合金元素(wt%):C:0.032;Si:0.5;Mn:1.3;Cr:0.48;Mo:0.75;Ni:4.5;
(2)纳米相形成元素(wt%):Ti:0.015-0.045;Cu:0.035-0.055; Zr:0.01-0.025:V:0.01-0.025;
(3)杂质元素(wt%):Al:<0.05;S:≤0.01;P:≤0.01;O:≤0.005;N:≤0.005;
其中碳元素C(wt%):0.03-0.05;
镍元素Ni(wt%):4-4.5;
将主合金元素、纳米相形成元素和杂质元素与碳元素和镍元素混合后通过熔化过程熔化为金属液体,通过拉丝制成焊丝。
2.根据权利要求1所述的一种超低碳马氏体高强韧熔化极气体保护焊用焊丝,其特征是:所述焊丝使用95%Ar+5%CO2焊接用保护气体进行焊接。
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CN101062534A (zh) * | 2006-04-28 | 2007-10-31 | 株式会社神户制钢所 | 耐气候性钢用气体保护电弧焊实芯焊丝及使用它的气体保护电弧焊方法 |
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CN102380694A (zh) * | 2011-09-15 | 2012-03-21 | 南京钢铁股份有限公司 | 一种高强管线钢埋弧焊纵焊缝的焊接工艺 |
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CN104955608A (zh) * | 2013-01-11 | 2015-09-30 | 株式会社神户制钢所 | 耐氢脆化敏感性优异的焊接金属和埋弧焊用实芯焊丝 |
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