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。
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。
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。
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。
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。
Original preheating temperature: the temperature of the workpiece in the weld zone immediately prior to any welding operation.
初始预热温度是指任何焊接操作开始之前，焊接区域内工件的瞬时温度。
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 fracture rod has cracks in the microstructure of weld zone, intergranular cracks exists in the coarse grain zone of the weld heat affected zone.
进一步比较了断裂拉杆和已经产生裂纹的拉杆焊缝区的显微组织，发现在焊缝的热影响区粗晶区存在沿晶裂纹。
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。
After solution treatment, the weld grains become coarse along with a large amount of granular precipitates dispersed in weld zone and base metal zones.
经过固溶处理后，焊缝组织晶粒变大，焊缝区和母材区弥散分布着大量的颗粒状析出物。
The paper studies the fatigue failure probabilistic model of the weld zone in welded joint using probabilistic fracture mechanics and reliabilitistic analysis methods.
本文采用概率断裂力学方法和可靠性分析方法，针对压力容器焊接接头的组织不均匀特点，研究了焊缝区疲劳失效概率模型。
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。
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。
By strictly clearing up weld zone, improving welding material's purity, strengthening molten pool's shield and controlling energy input etc measures, weld zone's hot crack and blowhole were prevented.
采取严格清理焊接区、高焊材纯净度、强熔池保护及控制线能量等措施消除了蒙乃尔合金焊接中的气孔和热裂纹，保证了产品焊接质量。
The result shows that the velocity field changes with the increase of space from shoulder and stir tool and the flow of weld metal from top to bottom and stir zone to rotation zone also weakens.
实验结果表明：随着距轴肩和搅拌针距离的增大，速度场开始减弱，焊缝金属由顶面向底面、由搅拌区向旋转区的流动也随之减弱。
The microstructure and fine structure of weld fusion zone for high strength fine grain steel were studied.
研究了高强度细晶粒碳素钢焊接接头熔合区附近的显微组织及精细结构。
Improvement of elongation of joint is related to weaker cool deformation degree of heat affect zone (HAZ) and uniformity of strength and stress level between weld and base metal.
接头延伸率的改善同热影响区冷变形程度的减弱及焊缝强度、应力水平同母材趋于一致有很大关系。
The Charpy impact test of base metal, weld and heat affected zone of X80 grade pipeline steel of certain factory was conducted, and its effective grain was researched.
对某厂x 80高钢级管线钢母材、焊缝、热影响区进行了夏比冲击韧性试验，对其有效晶粒进行了研究。
Through the analysis of elements affecting the rough crystal zone in pipeline steel weld, it raises the flexing direction of rough crystal zone of pipeline steel.
通过对管线钢焊接粗晶区韧性影响因素的分析，提出了管线钢粗晶区的韧化方向。
The main region of invalidation of the weld joint between different steels is commonly in fusion zone during welding or serving.
异种钢焊接接头在焊接时或使用期间，发生失效的主要区域通常在熔合区。
Dynamic recrystallization takes place in the weld nugget zone and fine grains are achieved.
焊核区发生动态再结晶，生成细小的等轴晶粒。
The concept of "weld bead heat affected zone"(WBHAZ) was proposed.
提出了“焊道热影响区”的概念。
The fracture toughness of the weld metal is lower than that of the base metal and the fracture toughness of heat-affected zone (HAZ) is intervenient between those of weld metal and base metal.
接头焊缝金属的断裂韧度显著低于母材，而热影响区断裂韧度则介于母材和焊缝金属之间。
The properties in weld deposit metal and Heat Affected Zone are strictly homogeneous with the base metal.
在焊接性能和热影响区金属矿床严格均匀与金属基材。
The appearence characteristics of the heterogenous mixture zone near the bottom of weld metal in the fusion welded joint are studied through metallographic observations of many fusion welded joints.
通过时大量熔化焊接头的金相观察，研究了熔化焊接头焊缝底部附近“不均匀混合区”的形貌特征。
Recognizing that the solubility of gas is greater in the liquid state than in the solid state, the subject of weld porosity is relevant to fusion zone discussion.
认识到溶解度的气体是更大的，在液体状态，比在固体状态下，受焊缝孔隙率是相关的熔合区的讨论。
The influence of weld heating on microstructure of heat affected zone was investigated in this paper.
探讨了焊接加热对热影响区组织的影响。
Metallurgical tests of cross-sectional weld samples indicate a minimal heat-affected zone that is identical to the parent metal.
剖焊样品的金相检验表明，成品的最小热影响区与母体金属完全相同。
It was found that with the increasing of carbon content, the martensite layer the weld bond disappeared, and the sawtooth-like of the partially melted zone widened.
结果发现随碳含量增加，熔合区中的类马氏体层消失，呈锯齿状的部分熔合区增宽。
Using the heat of welding to vapour water, cooling rates are lowered on the weld bead and heat -affected zone.
利用焊接时的加热使水汽化，不仅使焊道而且使热影响区的冷却速度减慢。
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