共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
3.
根据TC6钛合金组件的焊接和应用,研究了TC6材料的焊接工艺性。分别从组件的结构和技术要求、TC6钛合金的成分方面分析了TC6的焊接性,并对比试验了两种不同的焊接工艺方案获得的焊接接头。结果表明:采用焊前预热和焊后热处理的焊接工艺方案所获得的焊接接头比不采用以上措施获得的焊接接头更为合理,应用更安全、可靠。 相似文献
4.
5.
6.
《稀有金属材料与工程》1998,15(1):22-26
俄罗斯联邦国防工业部技术科学博土布拉图赫前不久撰文指出,将干线飞机的飞行寿命提高到4万h~6万h,同时减轻机体的结构重量,是世界飞机制造业的发展总趋势.提高航空技术装备的质量、可靠住并延长其使用寿命的基础,是包括产品所有加工阶段在内的行业一体化质量保证体系.在设计飞机的易疲劳构件时,要求材料既具有高的比强度和塑性,又具有尽可能高的断裂韧性.其中对构件质量的一个主要指标就是其总效率.完善半成品并选择构件的连接形式,对提高总效串可发挥重要作用,这通常不仅取决于结构材料的结构,还取决于其工艺条件.用电子束… 相似文献
7.
8.
9.
10.
《稀有金属材料与工程》1995,12(4):26-27
目前宇宙飞船上使用一种外加防护的球形压力容器。其内充氦用以驱动主发动机阀门,最高工作压力为31MPa,由两个外径0.66m的Ti-6Al-4V合金半球状套筒环形焊接而成,外部涂环氧树脂胶加以防护。每次飞行要对其充压两次,每次31MPa并保持数日。结果发现S/N33和S/N35这两种压力容器分别经9和10次飞行后即出现泄漏,X射线检测发现焊缝中有裂纹及相关的孔洞。 相似文献
11.
12.
13.
14.
《Science & Technology of Welding & Joining》2013,18(3):159-167
AbstractThe various aspects of weldability, seen as a material property, are introduced. These are illustrated by considering examples, in particular the recent advances in structural C–Mn and microalloyed steels. Important issues for the further development of the weldability of these materials are outlined. In concluding, the growing importance of mathematical modelling as a tool for the design of new weldable materials is emphasised. 相似文献
15.
对薄板TC4钛合金进行TIG电弧和激光焊接技术研究,重点分析了TIG焊接电流、焊接速度和激光输出功率对TC4钛合金焊接接头晶粒尺寸、微观组织和显微硬度的影响规律. 试验结果表明,在实现薄板TC4钛合金完全熔透的条件下,激光焊接具有更小热输入,接头焊缝区和热影响区宽度也显著降低. TIG焊接接头晶粒尺寸随热输入增加,呈现增加趋势. 随距焊缝中心位置增加,焊接接头晶粒尺寸均逐渐降低. TC4钛合金激光焊接接头焊缝区呈现魏氏组织特征,针状α'马氏体细小. 近缝热影响区组织为网篮状α'马氏体,而近母材热影响区为未转变α相和针状α'马氏体的双相组织. 随距焊缝中心位置增加,马氏体生成量逐渐减少,焊缝显微硬度值呈现降低趋势;同时相比于TIG焊接,TC4激光焊接接头具有更高的显微硬度. 相似文献
16.
从焊缝成形、焊缝气孔、接头力学性能、微观组织、接头抗腐蚀性能等方面对TA15钛合金A-TIG焊进行了试验研究,并和常规TIG焊进行了比较.结果表明,A-TIG焊能够有效减小熔宽、增加熔深;A-TIG焊能够有效减少气孔数量,提高接头的抗拉和抗弯性能;和常规TIG焊相比,A-TIG焊HAZ较窄且组织较细,而两者的焊缝区组织基本相同;活性剂的加入并没有降低A-TIG焊接头的抗腐蚀性能.总之,TA15钛合金A-TIG焊比常规TIG焊具有明显优势. 相似文献
17.
18.
19.
Władysław Włosiński 《Welding International》2013,27(12):923-926
Environmentally friendly welding methods applied in the welding of advanced materials are reviewed in this article. Friction welding, diffusion welding and vacuum soldering are discussed. The possibility of friction welding's application in the case of metals and elastic materials (e.g. Al2O3), is presented on the basis of an analysis of the existing literature, as well as the author's and his doctoral students’ own papers. Non-uniform distribution of pressure, deformations and temperature upon welded surfaces during the welding process is discovered. The influence of Al diffusion into Al2O3 on the state of proper stresses in a joint is determined. The diffusion coefficient of Al into Al2O3 is estimated at a level of 1.8 × 10 ? 13 ms? 1, and the size of stresses caused by diffusion is from 0.2 to 0.8 MPa. The intermetallic Fe–Al type alloys welded with construction steel with diffusion methods are characterized by high tensile strength from 304 to 362 MPa. An exemplary utilization of the discussed welding methods is presented in the case of rollers operating in fluid-flow machines. The discussed welding methods can be used not only in laboratory and research work, but also under industrial conditions. 相似文献