共查询到20条相似文献,搜索用时 78 毫秒
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利用铜衬垫技术,采用富氩气体保护焊和直缝焊接工装对机车总风缸纵缝进行焊接.通过反复调试,得出了铜衬垫的形状尺寸及焊接工艺参数.结果表明:采用匹配的焊接参数,合理的铜衬垫形状尺寸,能够获得内在和外观质量都很好的焊缝 相似文献
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介绍在广东惠州平海电厂末级再热器中新型奥氏体耐热钢(HR3C)焊接过程中出现的问题。通过严格控制层间温度和焊接线能量以及根部充氩保护,解决了末级再热器中新型奥氏体耐热钢(HR3C)焊接过程中出现的问题。实例说明,通过严格控制层间温度和焊接线能量以及根部充氩保护措施,新型奥氏体耐热钢的焊接质量是可以保证的。 相似文献
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研究了T91与10CrMo910钢的异质焊接工艺,确定出预热和层间温度,选择了焊接材料,制订出相应的工艺参数和焊接、热处理工艺。通过焊接工艺试验评定表明:此焊接工艺选择适当,焊接接头的力学性能、显微组织满足要求,可以保证工程焊口质量。 相似文献
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Tatiana Resende Alvarez Marjorie Rosemback Correia Pavarino Guttemberg Chagas de Souza Juan Manuel Pardal Sérgio Souto Maior Tavares Miguel Luiz Ribeiro Ferreira 《Welding International》2016,30(5):348-358
Duplex stainless steels are materials that present high corrosion resistance with high values of mechanical strength, therefore motivating their use in various components in the offshore industry. However, there are major challenges in the welding of these materials in terms of the productivity and quality of the joint produced, considering its extensive use for components of small thickness, such as umbilicals, to those of large thickness, such as salt water injection pipelines. In relation to pipes of small thickness, the gas tungsten arc welding process is successfully used. In thick-walled pipes, the automatic process of submerged arc welding (SAW) has been recently implemented in lines of pre-assembled piping, and this has considerably increased the productivity of the joints produced, though, a great deal of time is required to perform a new weld pass, due to the fact that the maximum interpass temperature needs to be lower than 150 °C. This work presents the results of characterization and the evaluation of corrosion resistance of a welded joint corresponding to DSS UNS S31803, with a wall thickness of 21.4 mm, welded by the gas metal arc welding process in the root and SAW process in the filling and cap passes, employing an interpass temperature between 150 and 290 °C. The results of the characterization of the mechanical properties, chemical composition and corrosion resistance in different regions of the welded joint were compared with those obtained for the base metal of the pipe, as well as with the minimum values required by the project standards. Therefore, this study has made an evaluation of the influence of the interpass temperature in the properties of the joints produced, motivated by a possible increase in productivity in pipe welding. 相似文献
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随着特高压输电线路的建设,钢管塔因结构传力清晰、用钢量少、占地面积小、塔型美观及附加荷载小等优点得到了广泛的应用,其主要构件采用带颈法兰和直缝焊管,其中带颈法兰与钢管的环向对接焊缝是钢管塔加工的关键工序之一,全部要求一级焊缝。为确保焊缝质量,保证钢管塔的安全运行,在此提出了钢管塔的自动焊接技术。分别从焊接设备、焊接工艺、焊接质量和效率对比等方面,介绍了管的纵缝双丝埋弧自动焊工艺、钢管与法兰的环缝对接内外气体保护焊工艺,阐述了自动焊接技术在输电线路钢管塔中的应用。目前该自动焊技术已广泛应用于"皖电东送"特高压项目。自动焊接技术的应用保证了焊缝质量,促进了生产效率的提高,改善了劳动环境。 相似文献
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17Cr2Ni2AH和16Mn R的熔化极活性气体保护电弧焊的难点在于对易淬火钢17Cr2Ni2AH侧熔合线附近和热影响区域微观组织的控制。对预热及层间温度(Preheat And Interpass Temperature,PAIT)进行对比试验,通过分析微观组织形貌,结合综合力学性能测试确定最佳PAIT。结果表明,不同的PAIT对加热速度、焊接最高温度、奥氏体化持续时间、冷却速度等产生较大影响,进而影响焊接接头微观组织和综合性能;PAIT控制在约250℃时,易淬火钢17Cr2Ni2AH侧热影响区以马氏体回火组织为主,化学成分、晶粒分布均匀,熔合线过渡良好,焊接接头综合性能优良。 相似文献
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工模具钢预先热处理方法的探讨 总被引:4,自引:1,他引:3
本文描述要提高工模具钢的性能及使用寿命,在热处理上,通过最终热处理与预先热处理的密切配合能收到事半功倍的效果。并讨论了碳化物超细化的途径。 相似文献
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某化肥厂CO2吸收塔在使用中出现气体进口管角焊缝泄漏.停车检查,发现因内表面角焊缝有气孔,以致强腐蚀介质进入内衬与外筒之间,腐蚀外筒导致泄漏,接管下部筒体已腐蚀出一个环带状蚀坑(图1),腐蚀部位外简体剩余壁厚仅有0~6 mm,应厂方要求,对该缺陷修复处理. 相似文献
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Three dimension simulation analysis of the interpass stress and deformation during multipass welding
It has been widely studied about the final residual stress and deformation in muhipass welding of thick weldments. But there is a lack of a clear understanding of the interrelationship of interpass stress and deformation during multipass welding. In this study, a three dimension numerical model of a sixteen-pass double V-groove welded joint with 50 mm plate is developed to compute the stress field and deformation by using multiple CPU parallel processing technology. The following factors such as the non-linear of temperature, heat radiation, filling of material step by step and so on are considered. Distribution and evolution law of welding stress in the transverse and longitudinal section is analyzed in this paper, and the interpnss stresses are studied also. At the same time the evolution course of angular deformation amount is analyzed, and the experimental results show that the calculated resuhs accord with the measured results of angular deformation. 相似文献