高强钢X70海管的药芯焊丝气体保护焊工艺

针对X70管线钢使用范围广泛,而采用焊条电弧焊焊接效率不高的情况下,本文对使用气保护药芯焊丝焊接X70钢的焊接工艺进行了研究.依据X70钢的焊接性能与海管使用环境的要求,进行了焊接工艺试验.依据美国石油行业标准API 1104和HZ25-3/1焊接检验规格书对试验结果进行了分析,试验结果表明:焊缝经NDT检验,质量合格,力学性能良好.该焊接工艺成功应用于HZ25-3/1项目的X70管线立管的预制焊接中,焊接接头质量合格,焊接效率较采用焊条电弧焊工艺提高1倍以上.     

船用薄板CO_2焊控制焊接变形工艺研究

采用药芯焊丝CO2气体保护焊工艺对控制船用4mm薄板的焊接变形进行了试验研究,结果表明采用该工艺能较好地控制船用薄板的焊接变形,并得出了控制焊接角变形3°和纵向挠曲变形量在±6mm范围内的合理焊接工艺参数。     

2．25Cr-1Mo与0Cr218Ni9钢焊接工艺研究

在筒体母材为2．25Cr-1Mo钢的大型压力容器生产制造过程中,常涉及到0Cr18Ni9不锈钢内构件与简节2．25Cr-1Mo钢的焊接。阐述了采用药芯气体保护焊（FCAW）方法焊接该类异种钢的有关工艺要素？通过试验分析了如何调整工艺以改善焊接接头易出现脆化组织的情况,以使接头性能满足产品设计要求。     

钴对马氏体时效不锈钢模具堆焊焊丝堆焊层性能的影响

针对我国热作模具堆焊修复材料的缺乏和性能的不足,开展了马氏体时效不锈钢热作模具CO2气体保护焊金属粉芯堆焊焊丝的研究工作。通过改变Co元素的含量,研究了Co元素对所研制焊丝堆焊合金的硬度、时效行为、红硬性、显微组织和时效析出相的影响。结果表明,Co元素有利于焊后堆焊合金由奥氏体向马氏体转变,当w(Co)≥2%时堆焊合金为全马氏体组织;随着堆焊合金中Co元素含量增加,堆焊层的焊态硬度、时效态硬度和红硬性提高。     

气化炉镍基实心焊丝堆焊工艺研究与应用

通过工艺试验,镍基实心焊丝气体保护焊采用焊丝ERNiCrMo-3(φ 1.2 mm),保护气体选用I3(Ar+He)堆焊,基材1.7335(1Cr-0.5Mo)、SA-387Gr11CL2,其堆焊层化学成分、综合力学性能均满足EN规范要求,抗晶间腐蚀能力能够满足设备技术要求;焊缝成形美观,飞溅少,工艺性能良好,能有效减少焊接变形,提高了焊接效率.已应用于气化炉内件管屏等大面积堆焊制造,解决了气化炉管屏、壳体、接管大面积镍基堆焊技术难题.     

Prediction of wire transfer behaviors in laser hot wire welding

With preheating wire by resistance heat, laser hot wire welding improves process stability and wire deposition efficiency, which gives broad potential applications in sugracing and narrow gap welding. It is a critical issue to control the temperature of preheated wire in this process. The temperature which is so high that the wire fuses outside molten pool or so low that the wire cannot melt timely in the molten pool, results in poor wire transfer stability and bad weld formation. This paper is purposed to calculate the wire temperature for the prediction of wire transfer behavior under various welding parameters. A heat conduction model is set up. Heat sources of the wire include resistance heat and reflected laser, and the heat source of molten pool is laser. The calculated temperature of wire part outside the molten pool is verified by infrared ratio temperature measurement. The calculated temperature of wire part in the molten pool is verified by measurement of the molten pool size. Analyzing the wire temperature and welding process observed by the high speed video imaging, the temperature criteria of wire transfer behaviors are obtained. Thus, numerical simulation of the wire temperature can be used to predict wire transfer behaviors in laser hot wire welding.     

钛型气保护药芯焊丝的电弧行为、冶金特性及其工艺质量

本文分析了钛型渣系气保护药芯焊丝的电弧行为和化学冶金过程,探讨了药芯焊丝的焊接飞溅及焊缝中气孔工艺质量问题。结果表明,药芯焊丝熔滴过渡的基本形态是非轴向排斥过渡,焊丝的电弧形态属于活动、连续型,焊丝熔滴过渡受主导力控制。焊丝的焊接化学冶金过程是分区连续进行的。药芯焊丝熔滴过渡中伴随渣柱,以及渣柱直接进入熔池现象,可能导致焊接化学冶金反应不完全和;台金过程的新变化。药芯焊丝的焊接飞溅主要发生在非轴向排斥过渡的熔滴与焊丝之间的缩颈处,提出通过熔滴过渡指数控制焊接飞溅新观点。当气体从焊缝金属中逸出被阻止于焊缝中或被困于熔渣下面,就分别形成了气孔和表面压坑,提出了通过电弧中熔滴吸收氢的总重量控制焊缝中气孔的新思路。     

Analysis of metal transfer during electron beam welding with filler wire

The metal transfer mode of electron beam welding （EBW） with filler wire was studied experimentally. The spatial position between the electron beam and the filler wire was defined. Basing on the charge coupled device （CCD） visual sensing system, the metal transfer mode of filler wire was investigated. The results showed that there were five transfer modes during EBW process due to different wire feed rates and spatial positions between beam and filler wire, such as short-circuiting mode, molten metal bridge mode, small droplet mode, big droplet mode and mixed mode. By comparing the weld appearance of different transfer modes, the molten metal bridge transfer was proved to be the best transfer mode.     

ZM6镁合金焊丝热挤压-热拉拔工艺研究

采用热挤压-热拉拔的方法制备了(φ)3 mm的ZM6镁合金焊丝,并对组织演变进行了观察.结果表明,通过对挤压比、挤压温度、挤压速度的合理选择可以制备出(φ)4mm的焊丝坯料,再选用适当的拉拔道次和拉拔温度等参数能够生产出表面质量良好的(φ)3 mm的ZM6镁合金焊丝.ZM6镁合金热挤压后晶粒明显细化,经过4个道次热拉拔后晶粒尺寸进一步减小.     

药芯焊丝在表面工程中的应用

药芯焊丝的优势在堆焊、电弧喷涂耗材的研发与应用中更为明显.以图片、案例简要介绍药芯焊丝在电力、钢铁、水泥、矿山等行业中的关键设备的零部件堆焊和电弧喷涂技术的应用.