焊接接头微区氢行为的研究 Ⅰ——焊接接头微区氢浓度分布

用离子探针测定了１０ＳｉＭｎＮｉＣｒ钢不同焊接条件下的焊接接头微区氢浓度分布，首次获得了真实的氢浓度分布图象。并讨论了氢在焊接接头的分布行为．     

低碳贝氏体钢的摩擦焊接性

试验研究了低碳贝菌体钢０．１７℃－１，１．７２Ｍｎ－１。１２Ｃｒ－０．５２Ｍｏ的焊接工艺参数及热处理对组织和性能的影响。结果表明，摩擦变形量为１．０ｍｍ，焊接接头采用９１０℃正火。３５０℃回火，可得到良好的组织和性能。     

40Cr钢的恒温超塑性焊接

探讨了利用情理温超塑性实现４０Ｃｒ钢固相焊接的可行性及影响因素，并对超塑焊接接头及组织进行了观察与分析，试验表明，经超细化处理后的４０Ｃｒ钢在超塑性变形温度及应变速率范围内经短时超塑压接即可实现接头力学性能与基体相同的固相焊接。     

焊接接头微区氢行为的研究Ⅱ）──焊接接头近缝区受载缺口前端氢浓度再分布

用离子探针研究了１０ＳｉＭｎＮｉＣｒ钢不同焊接条件下氢在焊接接头负载缺口顶端的再分布，发现近缝区开裂方向有两个氮浓度富集峰。并探讨了双氢峰的形成机理。     

焊接接头微区氢行为的研究 Ⅱ——焊接接头近缝区受载缸口前端氢浓度再分布

用离子探针研究了１０ＳｉＭｎＮｉＣｒ钢不同焊接条件下氢在焊接接头负载缺口顶端的再分布，发现近缝区开裂方向有两个氮浓度富集峰。并探讨了双氢峰的形成机理。     

具有优异强度和韧性的改良型9Cr—1Mo钢板的开发及BOF生产工艺

新日铁采用氧气顶吹转炉（ＢＯＦ）冶炼，钢包精炼，单向凝固铸锭和轧制集成工艺生产了２５、５０和２７０ｍｍ厚改良型９Ｃｒ－１Ｍｏ钢板（ＡＳＴＭＡ３８７Ｇｒａｄｅ９１）。当些钢板在整个厚度方向上的化学成分和机械性能均匀，拉伸强度和蠕变强度优异，低温韧性和焊接性良好，这些钢板的ＧＴＡＷ，ＳＭＡＷ和ＳＡＷ焊接工艺的焊接接头也显示优异的机械性能，改良型９Ｃｒ－１Ｍｏ钢板不但在快速增殖反应堆（ＦＢＲ）蒸汽发生器     

管道用金属材料的抗磨耐蚀性能研究

海水工况对管道材料的抗磨，抗腐蚀综合性能有较高的要求。本文研究了Ａ３钢，４０ＣｒＭｏ、４０Ｃｒ、ＸＭＣｒＲ－Ｉ高铬铸铁，ＣｒＭｏＮｂ－Ⅱ中铬铸钢等几种管道材料的耐磨性能，耐海水腐蚀及其工艺性能。结果表明，ＸＭＣｒＲ－Ⅰ新型高合金高铬铸铁和ＣｒＭｏＮｂ合金风是理想的管道材料，当要求有较高耐磨性和耐蚀性且接口需焊接时高铬铸铁与中铬铸钢镶铸的工艺效果良好。     

锤式破碎机圆盘45钢与35CrMo铸钢的焊接技术

对进口锤式破碎机圆盘采用厂国产材料－－盘芯３５ＣｒＭｏ铸钢、盘片４５钢替代进行焊接加工,在焊接性分析的基础上,采取焊前预热、低氢焊接和焊后热处理等措施,成功地实现了钎式破碎机圆盘４５钢盘片与３５ＣｒＭｏ合金铸钢盘芯之间的焊接,圆盘已运行１年多,使用效果良好。     

仿“马利诺”耐海水钢试验简介

通过０．５ｔ电炉和φ５００轧机对“马利诺”进行三轮仿制试验，并进行了耐海水腐蚀试验和试制匹配焊条、焊丝及系统的焊接试验，试制出了焊性较好、耐海水腐蚀性能优良的耐海水钢０８ＣｒＭｏＣｕＳｉＭｎ、０７Ｃｒ２ＭｎＣｕＳｉ。     

低焊接裂纹敏感性WDL系列钢的焊接性能,应力腐蚀性能及应用

介绍了低焊接裂纹敏感性０７ＭｎＣｒＭｏＶ系列钢（简称ＷＤＬ钢）的焊接性能、应力腐蚀性能及应用情况。     

全截面焊接技术在阴极钢棒焊接中的应用

介绍了全截面焊接技术及装置在铝电解槽阴极钢棒焊接中的应用。与传统焊接工艺焊接效果对比,该技术能够实现阴极钢棒的全截面焊接,有效提高焊接阴极钢棒的焊接质量和焊接效率、降低焊口压降。生产实践表明,相对传统工艺,该工艺能够将工期缩短40h左右,上槽后压降降低15mV左右。     

高性能桥梁钢不同钢级埋弧焊性能研究

进行了高性能桥梁钢WNQ570、14MnNbq不同强度级别钢种埋弧焊性能试验研究。结果表明,采用WQ-1焊丝 SJ105Q焊剂匹配14MnNbq WNQ570钢,焊接接头具有优良的综合性能。采用的焊接工艺及焊接材料达到了大跨度桥梁钢接头性能指标。     

Effect of Welding Processes on Tensile and Impact Properties, Hardness and Microstructure of AISI 409M Ferritic Stainless Joints Fabricated by Duplex Stainless Steel Filler Metal

The effect of welding processes such as shielded metal arc welding, gas metal arc welding and gas tungsten arc welding on tensile and impact properties of the ferritic stainless steel conforming to AISI 409M grade is studied. Rolled plates of 4 mm thickness were used as the base material for preparing single pass butt welded joints. Tensile and impact properties, microhardness, microstructure and fracture surface morphology of the welded joints have been evaluated and the results are compared. From this investigatio.n, it is found that gas tungsten arc welded joints of ferritic stainless steel have superior tensile and impact properties compared with shielded metal are and gas metal arc welded joints and this is mainly due to the presence of finer grains in fusion zone and heat affected zone.     

Welding L415/316L Bimetal Composite Pipe Using Post-Internal-Welding Process

The butt welding of bimetal composite pipes generally adopts single-side welding, which easily gives rise to the problems such as high cost or crack initiation. In this paper, the butt welding of L415/316L bimetal mechanical lined pipes was conducted using post-internal-welding process, which is double-side welding process, proposed by the authors. Firstly, the effect of groove shape on the weld process was discussed. Then, microstructures and mechanical and corrosion-resistance properties of welded joints welded using two different welding materials, 309MoL and 309L, were investigated. The results show that the most suitable groove is that L415 is V shape with angle of 60° and blunt edge of 1 mm and 316L is stripped 6–8 mm. The weld of both 309MoL and 309L is composed of austenite and a small amount of ferrite, but the presence of Mo can refine the grains and increase the content of ferrite phase. The width of transition layer is about 0.6–0.8 mm located at the weld junction of stainless steel weld and carbon steel weld, and the transition layer mainly contains martensite. The tensile and bending performances of the welded joints using both 309MoL and 309L do meet the standard requirements. The welding wire 309MoL can improve the corrosion resistance to Cl− compared to 309L. It is advisable to use the post-internal-welding process and 309MoL for the welding of bimetal composite pipes under environments containing Cl−.     

Effect of welding processes on tensile, impact, hardness and microstructure of AISI 409M ferritic stainless joints fabricated using duplex stainless steel filler metal

 The present investigation is aimed at to study the effect of welding processes such as shielded metal arc welding, gas metal arc welding and gas tungsten arc welding on tensile and impact properties of the ferritic stainless steel conforming to AISI 409M grade. Rolled plates of 4 mm thickness were used as the base material for preparing single pass butt welded joints. Tensile and impact properties, micro hardness, microstructure and fracture surface morphology of the welded joints have been evaluated and the results are compared. From this investigation, it is found that gas tungsten arc welded joints of ferritic stainless steel showed superior tensile and impact properties compared with shielded metal arc and gas metal arc welded joints and this is mainly due to the presence of finer grains in fusion zone and heat affected zone.     

Q420GJ钢双丝埋弧焊接试验

通过双丝埋弧焊接工艺性能试验、焊接接头力学性能试验及组织结构分析等,对Q420GJ钢的焊接性能及相关组织结构进行了研究。结果表明:焊接接头综合力学性能优良,接头抗拉强度达到590MPa,焊缝-40℃冲击功平均值KV2达到119J;热影响区的韧脆转变温度在-30℃附近;焊接接头过热区组织为贝氏体,焊缝中含有较多的针状铁素体。     

Microstructure and properties of laser-arc hybrid welding of high-strength low-alloy steel

Laser-arc hybrid welding has the characteristics of optimal surface formation and greater penetration;it is extensively used in the welding of plates of medium thickness.However,for hybrid welding of lasers,the welding seam cooling rate is rapid;thus,the welding seam has a higher tendency to significantly harden,which has a negative impact on the weld quality of the high-strength low-alloy(HSLA)steel plates of medium thickness.In this study,laser-arc hybrid welding is performed on the BG890QL HSLA steel produced by Baoshan Iron&Steel Co.,Ltd.,and the quenching tendency of the welded structure is examined.The results demonstrate that the specific growth direction of the columnar crystal structure of the laser-arc hybrid welded joint is obvious.However,at the center and top of the welded seam,there are equiaxed crystals.The impact properties at room temperature and-40℃of the weld area are 58.0 J and 40.0 J,respectively,and those of the heat-affected zone(HAZ)are 147.0 J and 66.5 J,respectively.The impact performance can meet these requirements.Laser-arc hybrid welding of HSLA steel can yield strong and durable welds and the HAZ structure to meet the requirements of engineering applications.     

防护型车用超高强钢的焊接性及焊接工艺

常规工艺大都采用奥氏体、铁素体不锈钢焊丝焊接来避免出现焊接裂纹等缺陷,然而采用这类焊丝焊接的接头抗拉强度和硬度会大幅降低,使得车辆的防护性能也随之降低甚至失效。为了使超高强钢焊接接头的强度和硬度达到较高的使用要求,针对超高强钢(抗拉强度1 500MPa以上)的焊接性及焊接工艺进行了研究。通过理论分析,选取了与母材组织匹配的超低碳马氏体不锈钢焊材,制定了与之匹配的工艺方法及参数,使得焊接后接头与母材组织均为马氏体组织,且有效消除了焊接裂纹等缺陷,从而实现了焊接接头抗拉强度达到母材抗拉强度的70%以上,硬度与母材硬度相当的目标。在试验过程中,采用最经济的MAG焊焊接方法和较容易控制的预热温度,较为经济地满足了工业化生产应用。     

800 MPa级TRIP钢窄搭接焊接工艺研究

通过杯突试验、表面质量观察、焊缝金相组织分析,研究了800MPa级TRIP钢的焊接工艺性能。实验结果表明,焊接前无需预热处理;随着焊接电流的降低,焊缝表面起皮缺陷减轻;采用低电流、低焊接速度的合理匹配,并投入后退火工艺,焊缝熔合线区金相组织为贝氏体,可获得合格的杯突试验和优异的焊缝表面质量;试验钢焊接工艺选择与普材搭接焊接可获得最佳焊缝质量焊缝。     

手工电弧焊接QU120钢轨实践

分析了Qu120钢轨在使用过程中接头断裂的成因，结合现场实际介绍了钢轨手工电孤焊接方法、焊接材料、焊接工艺、实际操作体会，可供同类型的钢轨整体焊接借鉴。