改性沥青各种罐与管道用焊接材料选择的原则是：焊缝金属的性能应高于或等于母材性能。
The principle of choose on welding material of alter-asphalt in every kinds of tanks or tubes is: the character of welding seam metals should be higher than the original welding material.
另外采用系列加载试验对焊缝、母材的性能进行了研究。
In addition, series load experiments were used to study properties of weld and base metal.
用超声疲劳试验装置对Q235B母材及焊接接头试件进行超声疲劳试验，研究其在超高周疲劳寿命区间的疲劳性能。
Ultrasonic fatigue tests were carried out on Q235B base metal and welded joints by an ultrasonic fatigue test equipment in order to investigate their super high cycle fatigue properties.
焊后试件的性能测试结果表明，焊接接头的拉伸强度、断面收缩率、延伸率及冲击韧性均已超过母材。
The results of performance measurement test show that tensile-strength, contraction of cross sectional area, elongation percentage, dynamic ductility of the weld all exceed their base metal.
容器的液压爆破试验证明，母材和焊接接头具有良好的综合力学性能。
The hydrostatic pressure explosion test on vessel indicates tha both base metal and weld metal have good comprehensive mechanical properties.
本文研究了母材成分、石墨形态和工艺参数对重熔层性能的影响。
This paper investigates the effects of the mother material content, the graphite form and the technological parameters on the performance of remelting layer.
预热温度及层间温度控制在25 ~50为宜，接头拉伸和冲击性能与母材相匹配。
The preheating and interpass temperatures are 25 ~ 50c. Tensile and impact properties of the joints are almost the same as that of the matrix.
对圆环链母材进行理化检测，证明化学成分和各项力学性能指标均符合要求，只有常温冲击韧性不符合要求。
After chemical and physical test, on conveyor chain material, it is concluded that the composition and various mechanical properties can meet the standard, except impact toughness at room temperature.
本文介绍了对电站锅炉用BHW - 35钢母材和焊缝所进行的低周疲劳性能研究工作，提出了一些重要结论。
In this paper, the study of low cycle fatigue behavior of BHW-35 Steel material and weld bead using in fabrication of power plant boiler was introduced, a few of important conclusion was suggested.
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 crack resistance of X65 steel is much better than that of the weld and X65 pipeline steel has good crack arrest property.
两种焊接方法所得焊接接头成分均匀，硬度值均超过母材，综合性能良好。
The composition of the welded joint obtained by the two welding methods are all uniform, the hardness is higher than the matrix metal, the comprehensive property is good.
试样表面的平均硬度及耐腐蚀性能均高于镁合金母材。
The surface has better properties including hardness and corrosion resistance than that of AZ31B.
结果表明，试样焊接接头的组织及综合力学性能均优于母材，焊接工艺基本可行。
The results show that the microstructure and properties of the welding joints are higher than that of the basic metal. The welding process is fit for welding converter ring.
对钢轨闪光焊、气压焊和铝热焊进行火焰正火处理，并进行正火、未正火接头和钢轨母材的金相组织以及力学性能的对比。
The flame normalizing treatments were put forward on steel rail with flash welding, gas pressure welding and aluminium heat welding.
通过分析焊接接头组织和力学性能，表明与辙叉母材的性能基本一致，能够满足使用要求。
The welding metal can form granular bainite structure and mechanics property of welding joints is consistent with the parent metal. The result shows that this welding electrode can meet the need.
冷轧带肋钢筋母材的选用是影响冷轧带肋钢筋性能的关键因素，介绍了冷轧带肋钢筋专用母材的技术开发。
It is a key factor of choosing master material for cold rolled ribbed bars which affect the final product properties. The technology development of wire rod for cold rolled ribbed bars is introduced.
腐蚀试样的表面状态（粗糙程度）对母材金属的耐点蚀性能有明显的影响。
The surface condition (roughness) of corrosion test sample has a pronounced influence on the pitting resistance of the base metal.
结果表明：焊接接头高周疲劳性能低于母材的疲劳性能。
Results indicate that the fatigue strength of welded joints is lower than that of the parent metal.
力学性能试验结果表明，不加填充材料焊接时，试样拉伸强度仅为母材强度的31.24%；进行原位焊接时，试样强度达到母材强度的50.89%。
The mechanical testing results showed that tensile strengths of samples welded by direct welding is only 31.24% of that of the parent metal, and 50.89% of that by "in-situ" welding.
结果表明，钎焊温度过低或保温时间过短，钎料与母材相互冶金作用较弱，接头性能较差；
The results show that when the brazing temperature is lower or the holding time is shorter, the metallurgic reaction is not strong and the connection is not tight;
结果表明，钎焊温度过低或保温时间过短，钎料与母材相互冶金作用较弱，接头性能较差；
The results show that when the brazing temperature is lower or the holding time is shorter, the metallurgic reaction is not strong and the connection is not tight;
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