The formulae for calculating SIF and fatigue life of surface crack at weld toe of the high-strength steel under the combination stresses were given out.
给出了高强钢焊趾表面裂纹在压弯组合应力下应力强度因子及其疲劳寿命计算式。
The formulae for calculating SIF and fatigue life of surface crack at weld toe of the high-strength steel under the combination stresses have been presented.
给出高强钢焊趾表面裂纹在压弯组合应力下应力强度因子及其疲劳寿命计算式。
Some new technologies such as infrared thermal imaging, laser holography and microwave testing were prospected in the testing of weld crack.
对红外热成像检测、激光全息检测和微波检测新技术在焊接裂纹检测中的应用进行了展望。
It is proved by application that the expert system of weld crack diagnosis based on knowledge base can achieve the same diagnostic result as the expert.
应用证明基于知识库的焊接裂纹诊断专家系统可以得到与专家同样的诊断结果。
Through analysis on inside weld forming and welding procedure of SSAW pipe, it pointed out weld crack is easy to appear in brittle temperature zone in welding pool.
通过对螺旋埋弧焊管内焊缝成型和焊接过程的分析，指出焊缝裂纹易产生在焊接熔池脆性温度区。
It puts forward a conception of weld inclusions crack index so as to better control quality of weld seam.
为了更好地控制焊缝质量，提出了焊缝夹杂物裂纹指数的概念。
The results show that the crack initiates at the outer surface of the weld comer and propagates into the steel base material with a high cycle fatigue mode.
钎焊焊缝的枝晶间显微疏松导致的应力集中与微裂纹效应以及近焊缝区母材晶粒长大是导管早期疲劳开裂的主要原因。
The results showed that nonmetallic inclusions in weld seam served as crack initiation site under external bend load, and large amount of m a structure resulted in cleavage fracture of weld seam.
结果表明，焊缝金属中存在的非金属夹杂物，在低应力作用下形成微裂纹成为裂源，加之焊缝组织中存在大量的MA结构群，从而发生焊缝金属在室温下的解理断裂。
In this paper, the creep compliance of Hot-plate welded joint of PE80 pipe is measured, and the effect of creep on the crack tip stress field in the weld is investigated.
本文测定了燃气用PE80管材热板焊接接头的蠕变柔量，研究了蠕变对焊缝裂尖应力场的影响。
The influencing rules of the content of alloy elements in nickel-base spraying layer on the microstructure of austenite weld and the crack sensitivity were found.
得到了镍基喷焊层元素熔入量对奥氏体焊缝显微组织及裂纹敏感性的影响规律。
Analyses the cause for the crack resulting from the non-fusion in the longitudinal weld seam of a power plant boiler cylinder, and suggests corrective actions to eliminate the defect.
针对一台电站锅炉锅筒纵焊缝未融合引起的裂纹进行分析，并提出缺陷修复的办法。
Since the beginning of mass production of G70 in 1997 in Xi'an Rolling Stock Works, there has been report on weld crack on bolster web now and then.
西安车辆厂自从1997年开始批量生产G70一来，不时有罐体枕梁腹板立焊缝裂纹的报告。
The fatigue crack propagation rate of the fusion line and weld toe are greater than that of the others.
熔合线和焊趾处疲劳裂纹扩展速率较其他部位大。
The crack resistance of X65 steel is much better than that of the weld and X65 pipeline steel has good crack arrest property.
X65钢母材的抗开裂性能明显优于焊缝，且具有良好的止裂性能。
The second crack is a crack originating at the groove weld toe of the column flange-girder flange connection.
第二种是产生于立柱翼缘与主梁翼缘连接处的坡口焊缝焊趾处的裂纹。
The application status of magnetic particle testing, penetrant testing, eddy current testing, radiographic testing and ultrasonic testing in weld crack inspector were introduced.
介绍了磁粉检测、渗透检测、涡流检测、射线检测和超声波检测技术在焊接裂纹检测中的应用状况。
The research focuses on the defect equivalent analytical methods in building steel structure butt weld fusion and the effects of non-crack-type defects on the normal use of butt weld fusion.
本课题研究了建筑钢结构熔透对接焊缝中缺陷当量的分析方法和非裂纹类缺陷对焊缝正常使用的影响。
By analyzing the relation of microstructure, weld zone quality and tensile property, it is concluded that the welding technological parameter of L245 steel is the main factor of the welding crack.
通过分析l 245钢埋弧焊焊缝区质量、微观组织和拉伸性能关系表明，焊接工艺参数的合理制定是低合金钢l 245焊管产生裂纹等缺陷的关键因素。
In the long pipeline, because the end surfaces of the welded pipes have the geometrical errors which induce the butt weld defects, the stress corrosion crack will occur.
在长输管道生产中，由于焊管管端几何形状误差而引起的对接焊缝缺陷是造成应力腐蚀断裂的主要原因之一。
A method about improving the crack resistance of weld metal and reducing structure stress during welding process, i. e. hammering welds and watered rapid cooling after welding, was obtained.
研究出了提高焊缝金属抗裂性能及降低焊接过程结构内应力的工艺方法——焊后捶击焊逢并浇水快速冷却。
Through orthogonal experiment, laser power, scanning rate and gas flow were optimized and pretreatment techniques were adopted to cancel pore and crack in laser weld of LY12CZ.
为消除LY 12 CZ铝合金激光焊接时焊缝中常见的气孔和裂纹缺陷，通过正交实验，优化了激光功率、扫描速度、保护气体流量等工艺参数，并采取适当的焊前预处理工艺。
An expert system of welding crack diagnosis based on knowledge base is posed according to the analysis of characteristic of weld crack.
从分析焊接裂纹的特点出发，提出了基于知识库的焊接裂纹诊断专家系统。
Micro characteristic of cracks propagation research: the path of crack propagation in the heat-affected zone and weld metal is the mix of transgranular and intergranular.
裂纹扩展的微观特征研究：在热影响区与焊缝区的裂纹扩展均为沿晶与穿晶混合型。
This paper focuses on the design and implementation of et weld detecting system and the research of TOFD crack localizing algorithm in non-destructive testing area.
本文主要设计开发了基于无损检测中涡流检测的焊缝识别处理机和研究了无损检测中的超声tofd检测的缺陷定位算法。
The fatigue crack growth (FCG) behavior of the weld heat-affected zone of 14MnNbq bridge steel was systematically investigated in this paper.
从最弱链模型的物理本质出发，探讨了影响焊接热影响区脆性断裂的主要因素。
Through the pipe sample cutting and analyzing the crack in the fillet weld between the hot reheat pipe and the warming pipe, it was found out that the cause of the crack is due to the thermal fatigue.
通过对再热热段至低旁暖管管道角焊缝上裂纹的解剖分析，其原因是热疲劳裂纹引起的。
The bolt fastening metal structure of tower crane and pin structure without deformation, no weld crack.
塔吊的紧固金属结构的联接螺栓和销轴，结构件不得有变形，焊缝不得有裂纹。
The bolt fastening metal structure of tower crane and pin structure without deformation, no weld crack.
塔吊的紧固金属结构的联接螺栓和销轴，结构件不得有变形，焊缝不得有裂纹。
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