CN102380694A - Welding process for longitudinal weld joints of submerged-arc welding for high-strength pipeline steel - Google Patents
Welding process for longitudinal weld joints of submerged-arc welding for high-strength pipeline steel Download PDFInfo
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Abstract
本发明属于高强度管线钢焊接技术领域，是一种高强管线钢埋弧焊纵焊缝的焊接工艺，高强管线钢化学组分：C0.04-0.06%，Si0.08-0.10%，Mn1.2-2.0%，Nb+V+Ti+Zr0.09-0.10%，Mo0.2-0.4%，Ni+Cr+Cu0.8-1.2%，P≤0.004%，S≤0.001%，余量为Fe；钢的碳当量Ceq≤0.53％，Pcm≤0.22%；焊丝化学组分：C0.08%，Mn1.75%，Si0.80%，S0.003%，P0.010%，Cu0.138%，Cr0.41%，Mo0.53%，Ni2.22%，Al0.011%，Ti0.05%，V0.015，Zr<0.01%，余量为Fe；埋弧焊采用X型坡口，坡口角度为90°，钝边4.8mm，焊接热输入量是21kJ/cm，焊接电流450-800A，电弧电压32-38V，焊接速度170cm/min，焊接热输入量21kJ/cm。本发明无焊前预热，无焊后热处理，不控制层间温度，焊接接头具有优良的综合性能，焊接接头各区域具有良好的冲击韧性储备及安全富裕度。The invention belongs to the technical field of high-strength pipeline steel welding, and is a welding process for submerged arc welding longitudinal welds of high-strength pipeline steel. The chemical components of high-strength pipeline steel are: C0.04-0.06%, Si0.08-0.10%, Mn1. 2-2.0%, Nb+V+Ti+Zr0.09-0.10%, Mo0.2-0.4%, Ni+Cr+Cu0.8-1.2%, P≤0.004%, S≤0.001%, the balance is Fe ; Steel carbon equivalent Ceq≤0.53%, Pcm≤0.22%; welding wire chemical composition: C0.08%, Mn1.75%, Si0.80%, S0.003%, P0.010%, Cu0.138%, Cr0.41%, Mo0.53%, Ni2.22%, Al0.011%, Ti0.05%, V0.015, Zr<0.01%, the balance is Fe; submerged arc welding adopts X-shaped groove, groove The angle is 90°, the blunt edge is 4.8mm, the welding heat input is 21kJ/cm, the welding current is 450-800A, the arc voltage is 32-38V, the welding speed is 170cm/min, and the welding heat input is 21kJ/cm. The invention has no pre-heating before welding, no post-welding heat treatment, no interlayer temperature control, the welded joint has excellent comprehensive performance, and each area of the welded joint has good impact toughness reserves and safety margins.
Description
技术领域 technical field
本发明属于高强度管线钢焊接技术领域，具体的说是一种高强管线钢埋弧焊纵焊缝的焊接工艺，涉及一种高强管线钢X120埋弧焊纵焊缝的焊接工艺。 The invention belongs to the technical field of high-strength pipeline steel welding, in particular to a welding process of submerged arc welding longitudinal seam of high-strength pipeline steel, and relates to a welding process of high-strength pipeline steel X120 submerged arc welding longitudinal seam welding process.
背景技术 Background technique
用于运输石油天然气的管线钢，从上世纪70年代开始投入使用X65，80年代X70钢被引入工程建设，90年代末生产出X80钢管，一直到目前研制的X100和X120钢，其强度逐渐发展到1000MPa以上。使用高强和超高强管线钢不仅可以降低建设高压输气管线的成本，而且可以提高输送天然气的效率，节省运行费用，是当前及未来管线钢发展的要求和趋势，这就要求高级管线钢具有良好的焊接性能。 The pipeline steel used to transport oil and gas has been put into use since the 1970s, X65, X70 steel was introduced into engineering construction in the 1980s, and X80 steel pipes were produced in the late 1990s. Until now, the strength of X100 and X120 steels has gradually developed. to above 1000MPa. The use of high-strength and ultra-high-strength pipeline steel can not only reduce the cost of building high-pressure gas pipelines, but also improve the efficiency of natural gas transmission and save operating costs. It is the current and future development requirements and trends of pipeline steel, which requires high-grade pipeline steel. welding performance.
我国自2005年以后出现超高强度管线钢X100/X120的研制报道，2006年10月，宝钢在新投产的5000mm宽厚板轧机上成功试制出超高强度X120管线钢板，目前尚处于设计阶段的西气东输三线主干线拟建设X100/X120级管线钢的试验段。对于目前高强度管线钢X120的焊接，还没一个可供参考的焊接工艺。 Since 2005, there have been reports on the development of ultra-high-strength pipeline steel X100/X120 in my country. In October 2006, Baosteel successfully trial-produced ultra-high-strength X120 pipeline steel on a newly put into operation 5000mm wide and thick plate mill. It is proposed to build a test section of X100/X120 grade pipeline steel for the main trunk line of the third line of the gas-to-east pipeline. For the current welding of high-strength pipeline steel X120, there is no welding process for reference.
发明内容 Contents of the invention
本发明所要解决的技术问题是，克服现有技术的缺点，提出一种高强管线钢埋弧焊纵焊缝的焊接工艺，无焊前预热，无焊后热处理，不控制层间温度，焊接接头具有优良的综合性能和良好的冲击韧性储备。 The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, and propose a welding process for the longitudinal weld seam of high-strength pipeline steel submerged arc welding, without preheating before welding, without heat treatment after welding, without controlling the interlayer temperature, and welding The joint has excellent comprehensive performance and good impact toughness reserve.
本发明解决以上技术问题的技术方案是： The technical scheme that the present invention solves above technical problem is:
一种高强管线钢埋弧焊纵焊缝的焊接工艺，⑴高强管线钢化学组分及重量百分比为：C：0.04-0.06%，Si：0.08-0.10%，Mn：1.2-2.0%，Nb+V+Ti+Zr: 0.09-0.10%，Mo：0.2-0.4%，Ni+Cr+Cu：0.8-1.2%，P≤0.004%，S≤0.001%，余量为Fe和不可避免的杂质；钢的碳当量Ceq≤0.53％，Pcm≤0.22%； A welding process for submerged arc welding longitudinal welds of high-strength pipeline steel, (1) The chemical composition and weight percentage of high-strength pipeline steel are: C: 0.04-0.06%, Si: 0.08-0.10%, Mn: 1.2-2.0%, Nb+ V+Ti+Zr: 0.09-0.10%, Mo: 0.2-0.4%, Ni+Cr+Cu: 0.8-1.2%, P≤0.004%, S≤0.001%, the balance is Fe and unavoidable impurities; steel The carbon equivalent Ceq≤0.53%, Pcm≤0.22%;
⑵所用焊丝化学组分及重量百分比为：C：0.08%，Mn：1.75%，Si：0.80%，S：0.003%，P：0.010%，Cu：0.138%，Cr：0.41%，Mo：0.53%，Ni：2.22%，Al：0.011%，Ti：0.05%，V：0.015，Zr<0.01%，余量为Fe和不可避免的杂质； (2) The chemical composition and weight percentage of the welding wire used are: C: 0.08%, Mn: 1.75%, Si: 0.80%, S: 0.003%, P: 0.010%, Cu: 0.138%, Cr: 0.41%, Mo: 0.53% , Ni: 2.22%, Al: 0.011%, Ti: 0.05%, V: 0.015, Zr<0.01%, the balance is Fe and unavoidable impurities;
⑶埋弧焊采用X型坡口，坡口角度为90°，钝边4.8mm，在室温环境下焊接，无预热，不控制层间温度，焊接热输入量是21 kJ/cm，焊接电流450-800A，电弧电压32-38V，焊接速度170cm/min，焊接热输入量21kJ/cm。 (3) Submerged arc welding adopts X-shaped groove, the groove angle is 90°, and the blunt edge is 4.8mm. It is welded at room temperature, without preheating, and does not control the interlayer temperature. The welding heat input is 21 kJ/cm, and the welding current 450-800A, arc voltage 32-38V, welding speed 170cm/min, welding heat input 21kJ/cm.
本发明进一步限定的技术方案是： The technical scheme further defined in the present invention is:
前述的高强管线钢埋弧焊纵焊缝的焊接工艺，焊丝直径为4mm，选用的焊剂牌号为OK Flux 10.62。 For the aforementioned high-strength pipeline steel submerged arc welding longitudinal weld welding process, the welding wire diameter is 4mm, and the selected flux grade is OK Flux 10.62.
前述的高强管线钢埋弧焊纵焊缝的焊接工艺，焊剂烘焙制度为350℃×2h。 For the aforementioned high-strength pipeline steel submerged arc welding longitudinal weld welding process, the flux baking system is 350°C×2h.
前述的高强管线钢埋弧焊纵焊缝的焊接工艺，对厚度为12.7mm+12.7mm组合钢管埋弧焊纵焊对接接头采用内外三丝埋弧焊，一次成型。 The aforementioned high-strength pipeline steel submerged arc welding longitudinal weld welding process uses internal and external three-wire submerged arc welding for the combined steel pipe submerged arc welding longitudinal welding butt joint with a thickness of 12.7mm+12.7mm, which is formed at one time.
焊接预热温度及层间温度的设定：为了满足管线钢实际现场焊接效率的要求，在进行高级管线钢设计时已经考虑了其焊接性能。通常用碳当量参数Ceq、Pcm来衡量其焊接性能。高级别管线钢都有较好的碳当量值，在焊接工艺适当时，能够避免产生较大的焊接缺陷，满足相关的性能指标要求。因此不进行预热及不控制层间温度，也未发现其存在焊接缺陷，对焊接接头进行显微观察也未发现显微缺陷。 Setting of welding preheating temperature and interlayer temperature: In order to meet the requirements of actual on-site welding efficiency of pipeline steel, its welding performance has been considered in the design of advanced pipeline steel. The carbon equivalent parameters Ceq and Pcm are usually used to measure its welding performance. High-grade pipeline steels have good carbon equivalent values. When the welding process is appropriate, large welding defects can be avoided and the relevant performance index requirements can be met. Therefore, no preheating and interlayer temperature were not controlled, and no welding defects were found. Microscopic observation of the welded joints also found no microscopic defects.
焊接材料的设定：在选用焊接材料时，首先考虑的是焊缝金属的强度和-30℃冲击韧性与基材匹配，本发明的焊丝配烧结焊剂OK Flux 10.62，形成的焊缝金属纯净度高，且焊缝组织以细小的针状铁素体为主，强韧性兼具；所选用埋弧焊丝配焊剂OK Flux 10.62熔敷金属的力学性能：抗拉强度Rm≥940MPa，屈服强度Rp0.2≥890MPa，延伸率A≥15％，-40℃冲击功AKv≥47J。 Setting of welding materials: When selecting welding materials, the first thing to consider is that the strength of the weld metal and the impact toughness at -30°C match the base material. The welding wire of the present invention is matched with sintering flux OK Flux 10.62, and the purity of the weld metal formed High, and the weld structure is dominated by fine acicular ferrite, with both strength and toughness; the mechanical properties of the selected submerged arc welding wire with flux OK Flux 10.62 deposited metal: tensile strength Rm≥940MPa, yield strength Rp0. 2≥890MPa, elongation A≥15%, impact energy AKv≥47J at -40°C.
焊接热输入量的设定：由于焊接热输入量变化将影响焊接热循环过程，由此将对焊接接头焊缝金属和热影响区的组织和力学性能带来影响。通过本发明的焊丝，当焊接线能量输入为21 kJ/cm时，焊接接头热影响区的各项性能均能满足其性能指标要求。 Setting of welding heat input: Since the change of welding heat input will affect the welding heat cycle process, it will have an impact on the microstructure and mechanical properties of the weld metal of the welded joint and the heat-affected zone. Through the welding wire of the present invention, when the welding line energy input is 21 kJ/cm, all properties of the heat-affected zone of the welded joint can meet the performance index requirements.
本发明的有益效果是：本发明能解决埋弧焊焊接工艺与匹配材料问题，无焊前预热，无焊后热处理，不控制层间温度，采用本发明方法焊接X120管钢，焊接接头具有优良的综合性能，焊接接头各区域具有良好的冲击韧性储备及安全富裕度。本发明实现了管线用钢X120钢管纵焊的对接，采用三丝埋弧工艺焊接，接头表面成型良好，具有优良的综合力学性能，焊缝及焊接热影响区具有良好的冲击韧性，能满足X120级别管线钢的性能指标要求。 The beneficial effects of the present invention are: the present invention can solve the problem of submerged arc welding welding process and matching materials, without preheating before welding, without heat treatment after welding, without controlling the interlayer temperature, and adopting the method of the present invention to weld X120 pipe steel, the welded joint has Excellent comprehensive performance, each area of the welded joint has a good impact toughness reserve and safety margin. The invention realizes the butt joint of longitudinal welding of X120 steel pipes for pipelines, adopts three-wire submerged arc welding, the joint surface is well formed, has excellent comprehensive mechanical properties, and the weld seam and welding heat-affected zone have good impact toughness, which can meet the requirements of X120 Performance index requirements for grade pipeline steel.
具体实施方式 Detailed ways
实施例1Example 1
本实施例为一种高强管线钢埋弧焊纵焊缝的焊接工艺，⑴高强管线钢化学组分及重量百分比为：C：0.04%，Si：0.08%，Mn：1.90%，Nb+V+Ti+Zr: 0.09%，Mo：0.2%，Ni+Cr+Cu：0.8%，P：0.004%，S：0.001%，余量为Fe和不可避免的杂质；钢的碳当量Ceq：0.53％，Pcm：0.22%； This embodiment is a welding process for submerged arc welding longitudinal welds of high-strength pipeline steel. (1) The chemical composition and weight percentage of high-strength pipeline steel are: C: 0.04%, Si: 0.08%, Mn: 1.90%, Nb+V+ Ti+Zr: 0.09%, Mo: 0.2%, Ni+Cr+Cu: 0.8%, P: 0.004%, S: 0.001%, the balance is Fe and unavoidable impurities; steel carbon equivalent Ceq: 0.53%, Pcm: 0.22%;
⑵所用焊丝化学组分及重量百分比为：C：0.08%，Mn：1.75%，Si：0.80%，S：0.003%，P：0.010%，Cu：0.138%，Cr：0.41%，Mo：0.53%，Ni：2.22%，Al：0.011%，Ti：0.05%，V：0.015，Zr<0.01%，余量为Fe和不可避免的杂质；焊丝直径为4mm，选用的焊剂牌号为OK Flux 10.62；焊剂烘焙制度为350℃×2h； (2) The chemical composition and weight percentage of the welding wire used are: C: 0.08%, Mn: 1.75%, Si: 0.80%, S: 0.003%, P: 0.010%, Cu: 0.138%, Cr: 0.41%, Mo: 0.53% , Ni: 2.22%, Al: 0.011%, Ti: 0.05%, V: 0.015, Zr<0.01%, the balance is Fe and unavoidable impurities; the diameter of the welding wire is 4mm, and the selected flux grade is OK Flux 10.62; The baking system is 350℃×2h;
⑶埋弧焊采用X型坡口，坡口角度为90°，钝边4.8mm，在室温环境下焊接，无预热，不控制层间温度，焊接热输入量是21 kJ/cm，焊接电流450A，电弧电压32V，焊接速度170cm/min，焊接热输入量21kJ/cm。 (3) Submerged arc welding adopts X-shaped groove, the groove angle is 90°, and the blunt edge is 4.8mm. It is welded at room temperature, without preheating, and does not control the interlayer temperature. The welding heat input is 21 kJ/cm, and the welding current 450A, arc voltage 32V, welding speed 170cm/min, welding heat input 21kJ/cm.
对厚度为12.7mm+12.7mm组合钢管埋弧焊纵焊对接接头采用内外三丝埋弧焊，一次成型。 The inner and outer three-wire submerged arc welding is used for the submerged arc welding longitudinal welding butt joint of the combined steel pipe with a thickness of 12.7mm+12.7mm, which is formed at one time.
实施例2Example 2
本实施例为一种高强管线钢埋弧焊纵焊缝的焊接工艺，⑴高强管线钢化学组分及重量百分比为：C：0.05%，Si：0.09%，Mn：1.80%，Nb+V+Ti+Zr: 0.095%，Mo：0.3%，Ni+Cr+Cu：1.0%，P：0.003%，S：0.0009%，余量为Fe和不可避免的杂质；钢的碳当量Ceq：0.50％，Pcm：0.21%； This embodiment is a welding process for submerged arc welding longitudinal welds of high-strength pipeline steel. (1) The chemical composition and weight percentage of high-strength pipeline steel are: C: 0.05%, Si: 0.09%, Mn: 1.80%, Nb+V+ Ti+Zr: 0.095%, Mo: 0.3%, Ni+Cr+Cu: 1.0%, P: 0.003%, S: 0.0009%, the balance is Fe and unavoidable impurities; steel carbon equivalent Ceq: 0.50%, Pcm: 0.21%;
⑵所用焊丝化学组分及重量百分比为：C：0.08%，Mn：1.75%，Si：0.80%，S：0.003%，P：0.010%，Cu：0.138%，Cr：0.41%，Mo：0.53%，Ni：2.22%，Al：0.011%，Ti：0.05%，V：0.015，Zr<0.01%，余量为Fe和不可避免的杂质；焊丝直径为4mm，选用的焊剂牌号为OK Flux 10.62；焊剂烘焙制度为350℃×2h； (2) The chemical composition and weight percentage of the welding wire used are: C: 0.08%, Mn: 1.75%, Si: 0.80%, S: 0.003%, P: 0.010%, Cu: 0.138%, Cr: 0.41%, Mo: 0.53% , Ni: 2.22%, Al: 0.011%, Ti: 0.05%, V: 0.015, Zr<0.01%, the balance is Fe and unavoidable impurities; the diameter of the welding wire is 4mm, and the selected flux grade is OK Flux 10.62; The baking system is 350℃×2h;
⑶埋弧焊采用X型坡口，坡口角度为90°，钝边4.8mm，在室温环境下焊接，无预热，不控制层间温度，焊接热输入量是21 kJ/cm，焊接电流600A，电弧电压35V，焊接速度170cm/min，焊接热输入量21kJ/cm。 (3) Submerged arc welding adopts X-shaped groove, the groove angle is 90°, and the blunt edge is 4.8mm. It is welded at room temperature, without preheating, and does not control the interlayer temperature. The welding heat input is 21 kJ/cm, and the welding current 600A, arc voltage 35V, welding speed 170cm/min, welding heat input 21kJ/cm.
对厚度为12.7mm+12.7mm组合钢管埋弧焊纵焊对接接头采用内外三丝埋弧焊，一次成型。 The inner and outer three-wire submerged arc welding is used for the submerged arc welding longitudinal welding butt joint of the combined steel pipe with a thickness of 12.7mm+12.7mm, which is formed at one time.
实施例3Example 3
本实施例为一种高强管线钢埋弧焊纵焊缝的焊接工艺，⑴高强管线钢化学组分及重量百分比为：C： 0.06%，Si： 0.10%，Mn： 1.60%，Nb+V+Ti+Zr: 0.10%，Mo：0.4%，Ni+Cr+Cu：1.2%，P：0.002%，S：0.0005%，余量为Fe和不可避免的杂质；钢的碳当量Ceq：0.51％，Pcm：0.21%； This embodiment is a welding process for submerged arc welding longitudinal welds of high-strength pipeline steel. (1) The chemical composition and weight percentage of high-strength pipeline steel are: C: 0.06%, Si: 0.10%, Mn: 1.60%, Nb+V+ Ti+Zr: 0.10%, Mo: 0.4%, Ni+Cr+Cu: 1.2%, P: 0.002%, S: 0.0005%, the balance is Fe and unavoidable impurities; steel carbon equivalent Ceq: 0.51%, Pcm: 0.21%;
⑵所用焊丝化学组分及重量百分比为：C：0.08%，Mn：1.75%，Si：0.80%，S：0.003%，P：0.010%，Cu：0.138%，Cr：0.41%，Mo：0.53%，Ni：2.22%，Al：0.011%，Ti：0.05%，V：0.015，Zr<0.01%，余量为Fe和不可避免的杂质；焊丝直径为4mm，选用的焊剂牌号为OK Flux 10.62；焊剂烘焙制度为350℃×2h； (2) The chemical composition and weight percentage of the welding wire used are: C: 0.08%, Mn: 1.75%, Si: 0.80%, S: 0.003%, P: 0.010%, Cu: 0.138%, Cr: 0.41%, Mo: 0.53% , Ni: 2.22%, Al: 0.011%, Ti: 0.05%, V: 0.015, Zr<0.01%, the balance is Fe and unavoidable impurities; the diameter of the welding wire is 4mm, and the selected flux grade is OK Flux 10.62; The baking system is 350℃×2h;
⑶埋弧焊采用X型坡口，坡口角度为90°，钝边4.8mm，在室温环境下焊接，无预热，不控制层间温度，焊接热输入量是21 kJ/cm，焊接电流800A，电弧电压38V，焊接速度170cm/min，焊接热输入量21kJ/cm。 (3) Submerged arc welding adopts X-shaped groove, the groove angle is 90°, and the blunt edge is 4.8mm. It is welded at room temperature, without preheating, and does not control the interlayer temperature. The welding heat input is 21 kJ/cm, and the welding current 800A, arc voltage 38V, welding speed 170cm/min, welding heat input 21kJ/cm.
对厚度为12.7mm+12.7mm组合钢管埋弧焊纵焊对接接头采用内外三丝埋弧焊，一次成型。 The inner and outer three-wire submerged arc welding is used for the submerged arc welding longitudinal welding butt joint of the combined steel pipe with a thickness of 12.7mm+12.7mm, which is formed at one time.
实施例的焊接接头的冲击韧性试验结果如下表： The impact toughness test result of the welded joint of embodiment is as follows:
表1 Table 1
由表1可知，通过采用本发明的焊接工艺，焊接X120钢板焊接接头各区域具有良好的冲击韧性储备及安全富裕度。 It can be seen from Table 1 that by adopting the welding process of the present invention, each area of the welded joint of the welded X120 steel plate has good impact toughness reserves and safety margins.
除上述实施例外，本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案，均落在本发明要求的保护范围。 In addition to the above-mentioned embodiments, the present invention can also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.
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| CN103056496A (en) * | 2012-12-28 | 2013-04-24 | 胜利油田龙玺石油钢管有限公司 | Combined wire automatic submerged arc welding technology |
| CN103433603A (en) * | 2013-07-24 | 2013-12-11 | 武汉一冶钢结构有限责任公司 | Equal-strength matching submerged arc welding method for strong-strength P690QL1 steel |
| CN104475935A (en) * | 2014-11-24 | 2015-04-01 | 南京钢铁股份有限公司 | Field welding method for CO2-corrosion-resistant pipeline steel |
| CN105234590A (en) * | 2015-11-18 | 2016-01-13 | 四川大西洋焊接材料股份有限公司 | SA-508Gr.3Cl.2 steel submerged arc welding agent for nuclear power engineering and special welding wire |
| CN109604863A (en) * | 2019-01-14 | 2019-04-12 | 上海连山金属材料有限公司 | A kind of high tough gas protecting welding wire |
| CN110788456A (en) * | 2019-10-24 | 2020-02-14 | 番禺珠江钢管（珠海）有限公司 | Multi-wire submerged arc welding process with low weld seam surplus height for thin-wall steel pipe |
| CN111001907A (en) * | 2019-12-05 | 2020-04-14 | 渤海造船厂集团有限公司 | An ultra-low carbon martensitic, high-strength and tough MIG welding wire for gas shielded welding |
| CN111015016A (en) * | 2019-12-05 | 2020-04-17 | 渤海造船厂集团有限公司 | An ultra-low carbon martensitic non-melting electrode gas shielded welding wire |
| CN112372118A (en) * | 2020-12-09 | 2021-02-19 | 南京钢铁股份有限公司 | Submerged arc welding method for low-Mo refractory steel |
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| CN103433603A (en) * | 2013-07-24 | 2013-12-11 | 武汉一冶钢结构有限责任公司 | Equal-strength matching submerged arc welding method for strong-strength P690QL1 steel |
| CN103433603B (en) * | 2013-07-24 | 2015-10-28 | 武汉一冶钢结构有限责任公司 | The grade of P690QL1 high strength steel mates buried arc welding method by force |
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| CN105234590A (en) * | 2015-11-18 | 2016-01-13 | 四川大西洋焊接材料股份有限公司 | SA-508Gr.3Cl.2 steel submerged arc welding agent for nuclear power engineering and special welding wire |
| CN109604863A (en) * | 2019-01-14 | 2019-04-12 | 上海连山金属材料有限公司 | A kind of high tough gas protecting welding wire |
| CN110788456A (en) * | 2019-10-24 | 2020-02-14 | 番禺珠江钢管（珠海）有限公司 | Multi-wire submerged arc welding process with low weld seam surplus height for thin-wall steel pipe |
| CN111001907A (en) * | 2019-12-05 | 2020-04-14 | 渤海造船厂集团有限公司 | An ultra-low carbon martensitic, high-strength and tough MIG welding wire for gas shielded welding |
| CN111015016A (en) * | 2019-12-05 | 2020-04-17 | 渤海造船厂集团有限公司 | An ultra-low carbon martensitic non-melting electrode gas shielded welding wire |
| CN112372118A (en) * | 2020-12-09 | 2021-02-19 | 南京钢铁股份有限公司 | Submerged arc welding method for low-Mo refractory steel |
| CN112372118B (en) * | 2020-12-09 | 2022-03-01 | 南京钢铁股份有限公司 | Submerged arc welding method for low-Mo refractory steel |
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