Many researches in recent years show that the effects of oxygen on weld microstructure and toughness are very obvious.
近年来，许多研究都表明：与合金元素一样，氧对焊缝显微组织和韧性的影响亦十分显著。
Based on the Schaeffler diagram, a software that predicts the weld microstructure of dissimilar metal weldments is designed, and its application is illustrated with an example.
利用舍夫勒图，设计了一套软件，用它可以预测异种钢接头焊缝组织，并通过一个具体实例说明了该软件的应用。
The results show that the addition of Zr increases the content of acicular ferrite and improves the microstructure of weld metal.
结果表明，锆的加入增加了焊缝金属中针状铁素体的含量，改善了焊缝金属的微观组织。
The toughness of weld metal is the highest while the coarse grained region in the HAZ is the lowest because of welding thermal cycle and formation of brittle microstructure.
试验钢由针状铁素体和少量块状铁素体组成，焊缝为典型的针状铁素体组织，焊接热影响区粗晶区以粒状贝氏体为主。
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。
The effect of yttrium oxide on microstructure, chemical composition and mechanical properties of weld metal was studied and the active mechanism of yttrium oxide was also discussed.
研究了稀土添加剂氧化钇对焊缝微观组织、化学成分以及焊缝金属力学性能的影响，并分析了氧化钇的作用机制。
The microstructure, hardness, wear resistance and thermal fatigue resistance of submerged -arc welded surfacing lay er in weld state and heat treatment state have been comparatively investigated.
比较研究了堆焊层在焊态和回火态的组织、硬度、耐磨性及抗热疲劳性能。
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。
The tensile properties and microstructure of LF6 aluminum alloy weld joint under simulating near earth space environment are studied by means of vacuum thermal cycling system.
采用真空热循环试验装置，模拟近地轨道空间环境，研究了LF 6铝合金焊接接头拉伸性能和微观组织，分析讨论了真空热循环对焊接接头的影响规律。
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。
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。
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。
It was also found out that proper re element addition could increase the toughness of the weld metal and improve its microstructure by grain refinement.
适量的稀土元素可改善焊缝金属组织的形态、细化晶粒、提高韧性。
The microstructure in weld metal, heat affected zone (HAZ) doesn't change, but the grains in HAZ grow up.
焊缝金属、热影响区中的微观组织基本没有变化，但热影响区组织晶粒略有长大趋势。
On the basis of analysis to microstructure and properties of weld of ERW pipe, types and features of heat treatment and the weld inspect after heat treatment are introduced.
在分析ERW钢管焊缝组成及性能特点的基础上，进而介绍了其在线热处理工艺种类、特点以及热处理后的焊缝检验。
The main influencing factors of the microstructure in weld metal are composition and cooling rate of the weld metal.
研究了焊缝金属相对宽度和焊缝金属强度对接头性能的影响。
The problem may be solved by using the gradient transitional layer, within which the composition and microstructure can vary gradiently, as a weld interlayer between ceramic and metal.
在陶瓷与金属间用一定厚度的成分和结构呈梯度变化的梯度过渡层作为连接二者的焊缝层，是解决陶瓷与金属连接时所存在问题的较好措施之一。
The results show that different post-weld aging temperatures lead to variations in microstructure and micro-hardness across the weld.
结果表明，焊后时效处理温度不同，焊接接头各微区显微组织和硬度发生的变化不同。
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 mechanical property of weld joint was tested and the microstructure was analysed, the welding process was proved feasible.
通过对焊接接头的力学性能检验、微观组织观察和分析，证明了该焊接工艺的可行性。
The microstructure of the welded joints was studied by optical microscopy. It is found that the weld nugget has a dynamic recrystallization, fine isometric crystal structure.
通过对焊接接头组织的分析，发现焊核区晶粒为明显的细化再结晶等轴晶；
The results show that:under the no preheating condition, the microstructure of weld metal is columnar austenitic, and brittle martensite exists in the fusion zone and over-heated zone unavoidably.
研究结果表明：在不预热条件下，用KD286焊补钢轨，焊缝组织为柱状奥氏体组织，熔合区和过热区不可避免地产生脆硬的马氏体组织。
Welding does not occur after pores, collapse, thermal strain and microstructure changes and so on. Significantly reduce post -weld treatment process.
激光焊点直径小、受热范围小，焊后不会出现气孔、塌陷、热应变及金相组织变化等现象，极大减小焊后处理工序。
The improvement of microstructure leads to a considerable reduction of the susceptibility of hot cracking of weld metal as indicated by the transverse-varestraint test.
增加焊缝中的共晶数量并改善其分布形态，从而有助于降低焊缝金属的热裂纹敏感性。
The improvement of microstructure leads to a considerable reduction of the susceptibility of hot cracking of weld metal as indicated by the transverse-varestraint test.
增加焊缝中的共晶数量并改善其分布形态，从而有助于降低焊缝金属的热裂纹敏感性。
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