共查询到20条相似文献,搜索用时 51 毫秒
1.
采用大间隙钎焊法对Ni3Al基合金IC6的铸造裂纹进行了补焊,补焊的IC6合金大间隙钎焊接头持久强度达母材的80%以上,补焊的IC6合金导向叶片已通过地面和空中试车。 相似文献
2.
3.
从生产实践的角度出发,探讨了对可挽救的轻合金铸件进行补焊的工艺技术,阐述了铸件补焊前的打磨、对补焊件的无损检测和后续处理等工艺要求。 相似文献
4.
电站锅炉高温再热器堵阀采用WC9铸钢材质时,由于受结构应力、交变应力、内应力、热应力等作用,堵阀阀体处会产生裂纹缺陷,影响机组安全运行。机组检修期间需进行金属检验,早发现、早处理;根据裂纹深度、面积,可采取打磨圆滑过渡、异质冷补焊、同质热补焊等方案进行处理;采用同质热补焊时,采用型号R407焊条,规格为?2.5,?3.2 mm,焊前预热至250℃,4 h恒热保温,层间温度控制在250~300℃,坡口满焊后进行350℃×2 h消氢处理,焊后电加热至(485±5)℃×4 h中温回火+(730±5)℃×2 h高温回火热处理,升降温速率控制在50~60℃/h,可有效保证焊接质量,消除安全隐患。补焊超过3次时,整体更换堵阀,从而推进了企业高质量发展。 相似文献
5.
针对由瑞士ABB公司制造的燃气-蒸汽联合循环发电机组的燃气轮机高温燃气部件在运行过程中出现的裂纹,分析了裂纹形成的原因,根据不同性质的裂纹,制定合理的补焊工艺,实践证明是可行的,避免了发电机组出重大事故,提高了高温燃气部件的使用寿命,有显著的经济效益。 相似文献
6.
锌合金铸件的补焊工艺范绍林山西太原市中国十三冶十公司(030008)汽车上的锌合金铸件很多,如汽化器、汽油泵、车门把手等,在使用中经常出现螺丝滑扣、裂纹、破碎等缺陷,由于锌合金的熔点低(420℃左右),补焊厚度又较薄,给补焊工作带来很大困难,稍有不当... 相似文献
7.
8.
9.
10.
铸造高温合金ZG4Cr28Ni48WSi2弯头,主要用于乙烯裂解装置,其铸态组织为单相奥氏体,工作温度达780~850℃,热强性和热稳定性要求高。弯头两端管口50mm长范围要求100%X射线探伤,检查中发现部分弯头管口处有气孔、缩孔、裂纹等缺陷,需补焊修复。 1 清除缺陷 (1)采用风动砂轮机清除缺陷,清除深度应小于壁厚2/3,如果清除深度超过2/3,但仍有缺陷时,应停止清除,先进行补焊,然后 相似文献
11.
手工焊因其灵活性和可达性高仍将继续发挥其作用,手工焊的脱技能化,将是一个长期面临的课题。通过监测熟练焊工焊接过程中焊接电流和焊接速度两个主要参数的调整情况,进而学习熟练焊工的经验,然后通过机人协作控制系统,用来弥补初级焊工的技能,实现了熟练焊工经验向初级焊工的传递。结果表明,学习熟练焊工得到的焊接电流和焊接速度的关系模型,不仅能够应用于文中提出的机人协作焊接系统中,也可以扩展到自动焊接领域,为全熔透焊接提供技术支持。 相似文献
12.
介绍了一种专用于小孔内填丝的新型管板接头氩孤焊机和机头在管板焊接工作中的应用,通过多次规范试验验证并最终确定坡口制备方式和焊接规范参数,焊接后经过射线检测、腐蚀试验、宏观金相试验、拉脱试验等的验证,确保焊接接头获得满意的焊接质量,为以后小孔内填丝焊接制造技术提供了一定的理论基础. 相似文献
13.
14.
15.
16.
Orthogonal experiment is employed to study a new kind of multiplex flux for nickel-base superalloy. This activated TIG welding flux is composed of NaF, MgF2 and CaF2, and their proportion is 5:4:1. Compared with conventional TIG welding, the penetration increases 164% by the action of the flux. Tensile test result indicates that the fracture strength of the mixed flux A-TIG weld bead is higher than base metal, and it increases along with the decrement of the welding current. The average extensibility of the weldment is beyond 100%, which means perfect ductility. MetaUographs elucidate that there exist lots of deep and evenly distributed dimples on the fiacture section of weld bead while on that of base metal there only exists a few shallow dimples and massive tearing ridge. 相似文献
17.
Cleiton Carvalho Silva Edvan Cordeiro de Miranda Marcelo Ferreira Motta Hélio Cordeiro de Miranda Jesualdo Pereira Farias 《Welding International》2016,30(6):443-451
The objective of the present work was to evaluate the influence of the welding parameters in the formation of defects in weld overlays with nickel-based alloys, and its possible elimination through the correct adjustment of the welding parameters. Coatings were deposited with the nickel-based alloy types Inconel 625, Hastelloy C276 and Inconel 686 on C–Mn steel plates, using GTAW cold wire feed process. The planning of the experiments was accomplished by applying the Taguchi method. The control factors evaluated were the energy technique (ET), the welding heat input (E), the type of alloy (L), the shielding gas (G) and the type of arc oscillation (T). Other parameters were maintained constant, having previously been investigated. The results showed that the arc oscillation type is spiral; although it contributes significantly to reduce the dilution level, it causes a strong instability to the process, resulting in most of the cases in surface defects or defects among passes. The optimum condition to avoid defects among passes was identified by the Taguchi method, which was constituted by the following combination of control factors: 2-2-2-3-3, or by: I energy technique (TE-I); medium heat input level (Emedium); Hastelloy C276 alloy; shielding gas Ar + He; double-8 arc oscillation. The optimum condition for the welding without defects results in high dilution level not being indicated for the welding of resistant coverings to the corrosion. 相似文献
18.
19.