Direct observation of hydrogen & induced cracking behavior in weld zone of medium carbon Q and T steel

中碳调质钢 焊接 区氢致裂纹行为的直接观察

Numerical Simulation of the Effects of Welding Processes on Temperature Field of GMAW Surfacing Weld Zone

焊接工艺对GMAW堆焊 焊缝 区温度场影响的数值模拟

In order to solve this weld problem the influence factor on transverse temperature location of weld zone have been researched such as V angle the distance from induce tance coil to weld points structure stress weld speed and welder power .

针对这个焊接难题，对 焊接 区横向温度分布的影响因素&V形角、感应线圈到焊接点的距离、结构应力、焊接速度和焊机功率进行了研究。

Weld metal zone are mostly acicular ferrite which can improve the weld zone toughness .

焊缝金属区晶粒分布均匀，焊缝金属区多为针状铁素体，能够提高 焊缝 区的韧性。

Finite Element Analysis of Restrain Stress in Weld Zone of High Strength Steel

高强度钢 焊接 区拘束应力的有限元分析

The weld zone is the weakest in welded joint due to effects of chemical components of filler and crystallization process .

因焊丝 合金化学成分和结晶过程的影响， 焊缝 处是合金接头的薄弱环节。

The reasons for the low impact toughness of the friction welded joint of drill pipe is that the metallurgical microstructure of the joint heat-treated after welding is not ideal and there are grey spots and FeS · MnS inclusions in the weld zone .

石油钻杆摩擦焊焊接接头冲击韧性低的原因是焊后热处理金相组织不理想和 焊缝 区存在灰斑及FeS·MnS复合夹杂物缺陷。

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L245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L245焊管产生裂纹等缺陷的关键因素。

After the parameter optimization the burning loss and evaporation of Mg element in the weld zone reduced .

参数优化后 焊缝 区Mg元素的烧损和蒸发量减少。

Crack propagation conducts alternatively between the weld zone and the partially molten zone and is not strictly to rupture at W / F boundary surface .

裂纹扩展在 焊缝 区和半熔化区之间交替进行，并非严格按W／F界面破断。

The results show that microstructure of weld zone greatly changes in the radial direction .

结果表明， 焊缝组织沿径向有较大的变化。

For this method the corrected approximation of inherent shear strain is exerted to the fillet weld zone as initial strain of the welded structure and angle distortion is predicted by elastic analysis .

该方法将角焊缝处固有剪切应变分量的修正近似值作为焊接结构的初始应变，施加在有限元模型相应的角 焊缝 区域，通过线弹性分析预测角焊缝焊接结构的角变形效应。

Results After stress-corrosion test there was no discoloration in the weld zone of the laser-welded cast samples .

不进行应力腐蚀试验的激光 焊接铸钛试样作为对照组。

With multi-layer welding thermal elasto-plastic definite element method the numerical demonstration is carried on to prove the engineering estimation formula of welding residual stress in the weld zone of butt welding structure provided in literatures .

利用多层焊热弹塑性有限元程序，对文献中所提出的对接焊结构 焊缝 区的残余应力估算公式进行数值验证。

The diffusion zone width of main alloying elements increases and hardness of the friction weld zone near TC4 titanium alloy side improves after post-weld heat treatment .

经焊后回火热处理后，主要合金元素沿 焊合 区的扩散区宽度增大； 焊合 区钛合金侧硬度值显著提高。

The ultrasonic impacting action at weld toe changes the stress from tensile to compressive . And the stress in weld zone is compressive .

焊趾处的超声冲击作用，焊接纵向残余应力由拉应力转变为压应力，同时 带动 焊缝 区域也处于压应力状态。

However with the rapid development of modern industry the weld zones in metal components are more and more so the corrosion of weld zone has become a hot issue .

但是，随着现代工业的迅速发展，金属构件的结构越来越复杂，焊缝区域越来越多，因此 焊缝 区域的腐蚀问题便成了当今研究的热点问题。

The simulated results show that the stress of weld zone changes from compressive stress to tensile stress during the moving of electron beam .

计算分析表明，随着电子束的移动， 焊缝 区的应力演变经历了从压应力状态向拉应力状态演变的过程。

The hardness tests on welding joints prove this by showing that the hardness reduces in fusion area and increases slightly in weld zone .

通过对焊接接头的硬度检测，发现熔合区硬度下降， 焊缝 区略有上升。

The research results show that : the forced cooling during FSW of copper can decrease the temperature of weld zone and heat-mechanical affected zone during welding minimize the soft zone width and weak degree and increase the properties of FSW joint .

结果表明，在紫铜搅拌焊接过程中进行强制冷却，可以降低焊接过程中 焊缝及热力影响区变形金属的温度，减小接头软化的程度和范围，提高搅拌摩擦焊接接头的性能。

Visual image sensing system for weld zone of pulsed GTAW

脉冲GTAW 焊接 区视觉图象传感系统

The ferrite grains were coarsened in the coarse zone of HAZ and weld zone with heat input increasing . The strength and ductility of the welded-joint was changed .

随着焊接热输入的增加，焊接热影响区的粗晶区和 焊缝 区中铁素体晶粒明显粗化，改变了焊接接头的强度和塑性。

A study of brittle fracture of weld zone in hydrogenation reactor

加氢裂化反应器 焊缝 区脆断研究

The results show that after welding microstructure of the weld zone and the heat affected zone are different from the parent metal showing characteristics of weave structure .

结果表明，焊接后 焊缝 区和热影响区的组织与母材的组织差别很大，表现为魏氏组织特征；

The composition of the explosive weld zone is a mixture of titanium and stainless steel about in the ratio of one to one among which the main phase is Ti ( Fe_ ( 0.75 ) Cr_ ( 0.15 ) Ni_ ( 0.1 )) _ .

爆炸 焊 熔 区的成份大约相当于钛与不锈钢以1∶1混合而成，其中主要的相是Ti（Fe（0.75）Cr（0.15）Ni（0.1））2。

The tensile strength and the elongation percentage of the parent metal and the weld zone increased slightly .

冲击处理使 焊缝 区和母材 区的强度和伸长率均有所增加。

The results show that the external electric field increases the solubility of the alloy elements in the weld zone of the friction welding joint promotes the formation of the precipitation phases with a small size and a dispersion distribution .

结果表明，静电场提高了摩擦焊接头 焊合 区的合金元素固溶程度，使s′相析出数量增多，并以小尺寸弥散分布；

Analyses of the microstructure gain size and hardness distribution of friction welded joints are given and the variation in microstructures near weld zone after tempered are studied .

文中对摩擦焊接头的组织、晶粒度和硬度分布进行了分析，并对回火后近 缝 区的组织变化进行了研究。

Macro-fracture Behavior of C-Mn Weld Zone in Notched and Precracked Specimens

C-Mn 焊缝 区缺口和裂纹试样的宏观断裂行为

The characteristics of partially melted weld zone and its effects on toughness in medium-carbon HSLA steel

中碳低合金高强度钢 焊接半熔化 区的特点及其对韧性的影响