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着重分析了焊接工艺对自动焊焊接质量的影响,给出了各工艺参数在不同焊接位置合适的范围,对自动焊与手工焊的成本及效率进行了对比分析。成功地对5台1000m^3精丙烯球罐进行了全位置自动焊。 相似文献
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对于长距离大口径管道的焊接施工,追求一种技术可靠、性能优越、效率高、费用低、环境适应能力强的焊接工艺是十分重要的。采用纤维素焊条向下焊打底、自保护药芯焊丝半自动焊填充盖面这一施工工艺,是在保证焊接质量的前提下提高工程进度的有效方法。本文介绍了这一施工工艺的特点及操作技术。1焊接技术1.1工艺特点 向下焊纤维素焊条有优异的填充间隙性能,对管子的对口间隙要求不严格,焊缝背面成形好,易于获得高质量的焊缝,特别适用于打底焊焊接,利用自保护药芯焊丝填充、盖面焊接熔敷效率高,全位置焊成形好,焊接接头抗冲击韧… 相似文献
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长输油气管道的自保护药芯焊丝半自动焊 总被引:1,自引:0,他引:1
简述了药芯焊丝的特点,并重点介绍了自保护药芯焊丝半自动焊接工艺及其在长输管道工程上的实际 应用情况,并对这种焊接方法的特点进行了简要总结. 相似文献
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自保护药芯焊丝半自动焊产生气孔原因分析及控制 总被引:1,自引:0,他引:1
20世纪90年代以来,自保护药芯半自动焊接技术在长输管道建设中得到引进和发展。在目前正在建设的忠一武管线施工中,为了提高工作效率,管口焊接均采用流水作业,一道焊口至少由8名焊工完成。因此,使焊接质量控制难度加大,尤其是气孔缺陷的分析及控制更为复杂和困难。在忠一武管线上管道二公司开始施焊的2个机组,对自保护药芯焊丝半自动焊气孔产生原因进行了科学分析,并采取了相应的控制措施,有效地保证了焊接施工质量。 相似文献
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Effect of oxygen-containing additives on weld penetration in self-shielded flux cored arc welding 下载免费PDF全文
The effect of Fe2O3 and Li2CO3 additives in flux core on the weld metal oxygen content and weld penetration in self-shielded flux cored arc welding were studied schematically. The result shows that the oxygen content in the weld metal and weld penetration both increased with the Fe2O3 addition increased in the range of 5wt.% to 20wt.% . The oxygen content in the weld metal was increased with the Li2CO3 addition increased in the range of 1wt.% to 8 wt.%. However, the weld penetration decreased when Li2CO3 addition exceeding 4 wt.%. High-speed photographic images show that when Fe2O3 addition in flux core exceeding 15wt.%, droplet became excessively large, so that spatters were frequently generated in large numbers. In this study, Fe2O3 and Li2CO3 in the amount of 11wt.% and 4wt.%, respectively, jointly added in the flux core can achieve a deeper weld penetration with sound usability characteristics. 相似文献
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Investigation on mechanism of fixing nitrogen in self-shielded flux cored arc welding 总被引:1,自引:0,他引:1
Prevention of nitrogen porosity in weld metal deposited with self-shielded flux cored wire with CaF_2-TiO_2-MgO slag system can be accomplished by using a "killing agent" such as titanium to react with nitrogen dissolved in the weld metal. The amount of titanium needed to prevent porosity is calculated thermodynamically for various dissolved nitrogen levels. Experimental flux cored wires are used to verify the thermodynamic model. It is concluded that approximately O.11 wt% titanium in the weld deposit is need to prevent nitrogen porosity when welding without externally applied shielding. 相似文献
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通过自制的5种药芯成分不同的自保护药芯焊丝,研究氟化钡和氟化钙的不同配比对焊接工艺性能、过渡熔滴、熔敷金属中P、Si的控制的影响。结果表明,随着:BaF2占氟化物总量的增加,立焊性能改善,焊接过程飞溅、烟尘减少,累积质量分数为50%时的熔滴的平均直径减小,而熔敷效率和Hmax/Bmax降低(Hmax为焊缝最大熔深,Bmax为焊缝最大熔宽)。BaF2比CaF2控制熔敷金属中P、Si含量的能力更强,并通过热力学分析解释了氟化物对熔敷金属中P、Si控制的机理。综合考虑焊接工艺性能和熔敷金属中P、Si的控制,药芯中选用BaF2占氟化物总量的75%~87.5%较为合适。 相似文献
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针对自保护药芯焊丝O型截面的实际构造,详细阐述了外皮钢带搭接对电弧形状和熔滴过渡形式的影响结果,分析焊丝外皮钢带搭接可引起的如飞溅、气孔等焊接缺陷的原因,并成功研制了一种性能良好的自保护药芯焊丝,提出了减少产生飞溅、气孔等焊接缺陷的措施。 相似文献
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0 IntroductionSelf-shielded flux cored wire is a newly developedwelding material used without gas protection. Use of suchcored wires has grown rapidly in developed countriesbecause of the following advantages: simple use, goodwind resistance ability, lower cost resulted from highproductivity and strong desulfurization ability[1]. Self-shielded flux cored wires are preferred for on-site weldingsuch as ship and barge building, storage tank, bridge,offshore oil platform buildings and so on[2 -3].… 相似文献