新型不锈钢焊接材料的优化设计

所研制的新型不锈钢焊条采用了低碳钢芯，通过药皮过渡合金，通过对焊条药成分的优化设计，分析了不锈钢焊条药皮中影响焊缝气孔生成率的因素及各因素对气孔率的影响规律，解决了出现焊缝气孔的问题，并彻底克服了不锈钢焊条药皮发红开裂的缺点，同时由于低碳钢焊芯的采用增加了焊条长度，减少了更换焊条次数，并可采用较大的焊接线能量，在很大程度上提高了焊接效率，经过测验表明，本焊条过渡合金量达到设计要求，焊缝熔敷金属具有优良的抗晶间腐蚀能力和综合力学性能。     

不锈钢焊条冶金过程硅元素过渡规律的研究

本文采用混料回归设计调整配方，探讨了钛酸型不锈钢焊条冶金过程中硅元素的过渡规律及影响因素，表明，焊条药皮中含量较多的硅铝酸盐是熔敷金属增硅的主要原因，一定量的合金粉对焊缝成分有一定的稀释降硅作用，稀土镁合金对硅的还原反应有较强的抑制能力，赤铁矿和氟化稀土分别在其最佳加入量时，熔敷金属中的硅含量最低，。     

药皮材料对A102焊条工艺性能影响的研究

在原Ａ１０２焊条药皮配方的基础上,改进药皮配方,研制的Ａ１０２焊条与原Ａ１０２焊条各项工艺性能对比试验研究的结果表明,研制的Ａ１０２焊条除飞溅率稍大,其它工艺性能均优于原Ａ１０２焊条．     

解决铸408焊条易红尾问题的途径的探讨

铸408焊条当使用允许的上限电流进行焊接,焊条用不到1/2长度就开始发红、变质,无法继续使用。本文对解决铸408焊条红尾问题的途径进行了探讨。试验结果表明,采用纯镍焊芯,通过药皮加入铁粉和稀土镁的办法可以彻底解决铸4O8焊条易红尾问题,并使铸408焊条其它方面的不足得到改善,从而研制成一种新型的镍-铁焊条——铸348。     

不锈钢焊条焊接镀铝钢板焊缝的组织和性能研究

热镀铝钢板由于具有钢的强度和铝覆层的优异的耐蚀性、耐热性等，应用日益广泛。目前．其焊接工艺一直倍受关注。介绍了采用18-8型不锈钢焊条，通过手弧焊对热镀铝钢板（8〉5mm）进行焊接的工艺方法，并对焊后的接头组织进行了分析。     

电容法测定低氢型焊条药皮湿度

通过测定低氢型焊条Ｊ５０７的药皮湿度和电容量的相关关系，发现在药皮湿度低于２．０％的范围内，焊条药皮的湿度值和电容量有很好的线性关系，由此可以通过测定焊条的电容量来确定焊条药皮的湿度。     

高效低烟尘结构钢焊条的优化设计

采用正交优化设计的方法实现了对低烟尘结构钢焊条药皮配方的优化设计.通过对试验结果的直观和方差分析，建立焊条烟尘量与焊条药皮组分含量之间的线性回归方程，对目标函数求极值，从而获得合金的最优配方.焊条药皮中还加入了适量的铁粉，提高了焊条的熔覆速率.通过实验验证，所研制的低烟尘结构钢焊条的各项工艺性能良好，烟尘量降低到4.12 g/kg.焊缝熔覆金属的机械性能达到GB/T5117-1995标准.     

碱性焊条药皮成分对工艺性能影响的研究

本文研究了碱性焊条药皮成分对其电弧稳定性及脱渣性的影响，并总结了国外关于碱性焊条药皮成分对工艺性能影响的研究状况。它对发展我国碱性焊条具有一定的指导意义。     

均匀设计在不锈钢焊条配方设计中的应用

介绍了均匀设计方法在焊条配方设计中的应用，该方法是目前焊条配方设计通用的经验法与正交设计法之外的又一理性方法，其适应于材料数与水平数范围较大的试验，是一种简单易行的试验方法。     

J507XG管道全位置电焊条的研制

本文研究了碱性立向下全位置焊接电焊条的工艺性能与焊条药皮配方的关系，着重测定了全位置焊接适应性，电弧稳定性，焊缝成型，焊接飞溅等性能与药皮中各物的相对含量之间的关系，得出了工艺性能良好的最佳焊条配方。     

1Cr13不锈钢焊接接头组织及力学性能的研究

采用钨极氩弧焊的方法,对3 mm厚的1Cr13马氏体型不锈钢板实施焊接,通过LOM,SEM方法对焊接接头组织及断口形貌进行观察及分析;利用显微硬度计、电子万能拉伸机测量了焊接接头的力学性能.结果表明,通过手工钨极氩弧焊,采用直流正接接法(焊接电流为80 A,焊接速度为110 mm/min)能够获得外观平整、组织均匀、力学性能满足要求的焊接接头.     

辙叉贝氏体焊条连接修复组织性能研究

针对现场焊补及修复不便问题,本文提供了一种铁路钢轨及组合辙叉专用贝氏体焊条,该堆焊焊条焊前不用预热,焊后不用热处理。通过对该焊条连接及修复的组织性能特征分析,结果表明,无论是堆焊修复还是连接其焊缝组织都是粒状贝氏体,堆焊层显微硬度与基体基本一致,连接焊缝的冲击强度达到70J/cm2,焊条的组织性能满足贝氏体辙叉钢修复要求。     

不锈钢TIG焊活性剂对焊缝性能的影响

针对TIG焊生产效率低，单层焊可焊厚度小等问题，采用活性化TIG焊（A-TIG），能够大幅度地提高焊缝熔深，从而提高焊接效率和生产率。研究了在不锈钢TIG焊中，5种单一成分的活性剂（SiO2、CaF2、TiO2、Cr2O3和NaF）对焊缝机械性能和微观组织的影响，试验结果表明，同传统的TIG焊相比，在相同规范下，上述5种活性剂都能够大幅度的提高焊缝的熔深，但是不同的活性剂对焊缝机械性能的影响不同，其中活性剂SiO2所形成的焊缝的抗拉强度和塑性最好，而活性剂Cr2O3所得到的焊缝硬度最大；活性剂对焊缝微观组织没有明显改变，仅仅改变了奥氏体和铁素体组织的纹理结构。     

Pitting and galvanic corrosion behavior of stainless steel with weld in wet-dry environment containing CI

Accelerated corrosion test of stainless steel with weld was carried out to investigate the corrosion behavior under the wetdry cyclic condition in the atmosphere containing Cl-. In the surface morphology, corrosion products were analyzed by metallographic observation, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the damage to stainless steel with weld in the atmosphere containing Cl- is due to localized corrosion, especially pitting and galvanic corrosion.Weld acts as the anode, whereas matrix acts as the cathode in the corrosion process. The pitting corrosion, including the nucleation and growth of a stable pit, is promoted by the presence of wet-dry cycles, especially during the drying stage. Pits centralizing in weld are found to be grouped together like colonies, with a number of smaller pits surrounding a larger pit. The composition of the corrosion products is Fe2O3, Cr2O3, Fe3O4, NiCrO4, etc.     

Pitting and galvanic corrosion behavior of stainless steel with weld in wet-dry environment containing Cl~-

Accelerated corrosion test of stainless steel with weld was carried out to investigate the corrosion behavior under the wet-dry cyclic condition in the atmosphere containing Cl?. In the surface morphology, corrosion products were analyzed by metal- lographic observation, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the damage to stainless steel with weld in the atmosphere containing Cl? is due to localized corrosion, especially pitting and galvanic corrosion. Weld acts as the anode, whereas matrix acts as the cathode in the corrosion process. The pitting corrosion, including the nucleation and growth of a stable pit, is promoted by the presence of wet-dry cycles, especially during the drying stage. Pits centralizing in weld are found to be grouped together like colonies, with a number of smaller pits surrounding a larger pit. The composition of the corro- sion products is Fe2O3, Cr2O3, Fe3O4, NiCrO4, etc.     

Effect of welding process on the microstructure and properties of dissimilar weld joints between low alloy steel and duplex stainless steel

To obtain high-quality dissimilar weld joints, the processes of metal inert gas (MIG) welding and tungsten inert gas (TIG) welding for duplex stainless steel (DSS) and low alloy steel were compared in this paper. The microstructure and corrosion morphology of dissimilar weld joints were observed by scanning electron microscopy (SEM); the chemical compositions in different zones were detected by en-ergy-dispersive spectroscopy (EDS); the mechanical properties were measured by microhardness test, tensile test, and impact test; the corro-sion behavior was evaluated by polarization curves. Obvious concentration gradients of Ni and Cr exist between the fusion boundary and the type II boundary, where the hardness is much higher. The impact toughness of weld metal by MIG welding is higher than that by TIG weld-ing. The corrosion current density of TIG weld metal is higher than that of MIG weld metal in a 3.5wt% NaCl solution. Galvanic corrosion happens between low alloy steel and weld metal, revealing the weakness of low alloy steel in industrial service. The quality of joints pro-duced by MIG welding is better than that by TIG welding in mechanical performance and corrosion resistance. MIG welding with the filler metal ER2009 is the suitable welding process for dissimilar metals jointing between UNS S31803 duplex stainless steel and low alloy steel in practical application.     

奥氏体不锈钢窄间隙激光填丝焊接性能

为了取代窄间隙TIG填充热丝焊接厚板奥氏体不锈钢,采用窄间隙光纤激光填丝焊接方法焊接了板厚为15 mm的SUS306LN奥氏体不锈钢.通过试验研究,确定了最适于窄间隙激光填丝焊接的坡口形式和最佳焊接工艺参数.利用所得最佳焊接条件,获得了成形美观、无焊接缺陷、力学性能高及焊接变形小的焊接接头,焊缝金属与母材形成良好的冶金结合.该焊接方法为厚板结构件的窄间隙填丝焊接确立了一种高效率的焊接技术,并成功地把该项技术应用到核聚变超导线圈盒的焊接上.     

新型不锈钢基PbO2/PbO2-CeO2复合电极材料的研制

报道了在不锈钢基体上电沉积制备PbO2／PbO2-CeO2复合电极材料．研究了电沉积工艺参数对不锈钢表面沉积二氧化铅的影响．采用XRD、SEM对得到的电极进行了相结构和形貌分析，把该新型电极材料应用于电积锌过程并与传统的铅电极进行了对比，结果表明，采用不锈钢基PbO2／PbO2-CeO2复合电极材料，锌电积过程的槽电压降低，电流效率高．