焊缝

As the weld deep and narrow, fast cooling rate, weld porosity generated in the process may not have enough time to escape from the melting zone.

由于焊缝深而窄，冷却速度又快，焊接过程中产生的气孔不一定有足够的时间从熔化区逸出。

An algorithm of 3D coordinates calculation method is proposed based on the principle of Line-Point Matching Algorithm. The determination and solution to the abnormalism of this algorithm are discussed in detail.

提出了基于直线一点匹配原理的焊缝三维坐标算法，讨论了这种算法的奇异性判据和解决措施。

The result shows that the quantity and size of acicular Al4C3 precipitates decrease with the decrease of heat input.

结果表明，随着热输入的减小，焊缝中的针状的Al4C3数量及尺寸均减小。

The transformation conditions and natures of acicular ferrite in the weld metal of microalloy steel s were analyzed systematically.

系统地分析了微合金钢焊缝金属中针状铁素体组织的形成条件及特点，对夹杂物粒径、数量进行了统计分析，并阐述了针状铁素体的形核位置。

Low carbon and low alloy steel ; weld metal ; microstructure ; acicular ferrite

低碳低合金钢；焊缝金属；显微组织；针状铁素体

The results indicated that a high volumetric ratio of acicular ferrite in the simulated weld metal can be obtained in case the ratio of manganese and silicon is in a certain range.

结果表明，当Si、Mn比在一定的范围时，焊缝中将出现高比例的针状铁素体；且在大尺寸奥氏体晶粒中的非金属夹杂物上形核，高密度微小的夹杂物(1μm以下)的弥散分布对其形核更为有利。

It was found that the mechanical properties of the joints decreased by the alclad and it will be increased dramatically by removing the alclad. The effect of alclad on the bottom surface is larger than on the top surface. The mechanical properties of 2024-T3 joints will fall down because alclad is entrapped into the welded joints by the rotating and stirring tools during the friction stir welding, similar with "inclusion" in fusion welding.

研究结果表明，包铝层的存在明显降低了2024-T3铝合金搅拌摩擦焊接头的力学性能；去掉包铝层后接头的性能显著提高；下表面包铝层对接头性能的影响大于上表面包铝层；当2024-T3铝合金表面带有包铝层进行搅拌摩擦焊接时，在搅拌头的旋转和搅拌作用下，包铝层被卷入焊缝中，形成类似于熔焊的&夹杂&，从而使得接头的力学性能下降。

The effects of carbonous density solid volume loading and silicon carbide particle size distribution on the microstructures and mechanical properties of the welding seams were investigated .

探讨了糊料的碳密度，固相体积含量以及碳化硅颗粒级配对焊缝显微结构和机械性能的影响。

The effects of carbonous density、solid volume loading and silicon carbide particle size distribution on the microstructure s and mechanical properties of the welding seams were investigated.

探讨了糊料的碳密度、固相体积含量以及碳化硅颗粒级配对焊缝显微结构和机械性能的影响。

In general no porosity is observed in the seam when the length of claviform intermetallic compound is less than 10 μm. Moreover, the microstructure in the seam plays a key role in the diameter of the pore.

界面棒状的金属间化合物长度低于10 μm时一般不产生气孔，而气孔的直径与焊缝内部的微观组织有关。

We are in a real jam.

我们的麻烦大了。

Hey, it's Ahmet from India, that foreign exchange guy.

看，那是印度的阿曼特，国际交换生