With the heat input of laser welding increases the hardness of HAZ decreases but it is higher than that of the base metal indicating no softened zone after laser welding .

焊接接头显微硬度随热输入的增大而减小，均高于 母 材，未出现明显的软化区。

It is important to study the special welding material of Inconel 718 alloy for base metal .

因此，研制与 母材相匹配的Inconel718合金专用 焊丝是十分必要的。

For achieving high-speed welding the melting current through the wire must be increased while the heat input of base metal and arc pressure should be controlled at a lower level this is a contradiction .

为了实现高速 焊接，一方面要减小对 母 材的热输入和电弧压力，同时还要增大通过焊丝的焊接电流，这是一个矛盾。

The whole welding zone turns to be as follow : the base metal is SiC particles reinforced Al matrix composite and the weld is partial zone in which TiC particles are reinforcement and Ti is matrix .

整个 焊接区域转变为 母 材是SiC颗粒增强的Al基复合材料，而焊缝主要是以TiC颗粒增强相以Ti为基体的局部区域。

The results show that the LC9 alloy can be welded by the linear friction welding successfully and the tensile strength of the welded joint is close to the base metal .

结果表明，线性摩擦 焊可成功焊接LC9超硬铝合金，焊缝的拉伸强度与 母 材 基本相同。

It is analyzed the limitation of traditional viewpoint which related the welding residual stresses only to the existence of plastic compressive deformation in weld and base metal .

分析了关于 焊接残余应力形成过程描述的传统观点的局限性和不足，指出材料力学的截面法不能用于分析 横向残余应力分量。

Laser welding speed is fast heat affected zone is small weld microstructure is refining laser welding deformation is small generally speaking mechanical properties of weld seam is stronger than the base metal .

激光焊接速度快，热影响区小，焊缝组织细化， 焊接变形小，一般激光焊缝的机械性能都强于 母 材。

The principles of welding consumable selection were discussedbased on the viewpoint that welds shall have the properties not inferior to those of the base metal to be joined in the extent required .

从焊缝 金属应具有不低于对 母 材要求的各项性能这一观点出发，讨论了 焊接材料选择的基本原则。

The research reveals that the hi-frequency welding process not only causes the difference between the structure of the metal under the thermal effect by welding and the structure of the base metal but also makes changes of orientation and continuity of the metal flow line in the steel ;

研究结果表明：高频焊接过程除造成 焊接热影响 区 与 基体的组织差异外，还改变了钢中金属流线的方向和连续性；

TIG remelting procedure is using tungsten argon arc welding at the transition zone of the weld joints which can make transition between the base metal and weld smoothly .

TIG重熔工艺是用钨极氩 弧焊 方法在焊接接头的过渡部位重熔一次，使焊缝与 基本 母 材之间形成平滑过渡。

Laser welding is chosen to produce TWBs because the laser welding speed is quick the weld is narrow and the damage to base metal is small .

而选择激光焊接来生产拼焊板，是因为它具有 焊接速度快、焊缝较窄、对 基体 金属的损坏较小等优点。

The system selects appropriate welding process materials and sequence designs the joint and supplies main process parameters based on the product structure base metal workpiece size and requirements of joint property .

该系统根据产品结构、 母 材 性能、 材科规格以及对接头性能的要求等.选择出合适的 焊接方法、 焊接材料和 焊接次序，进行坡口设计，确定焊接工艺参数。

A good understanding of the material flow can be helpful in predicting the formation of the joint establishing the relationship between the welding tool and base metal and explaining the friction stir welding joining mechanism .

对塑性材料的流动规律有较好的认识，可以预测FSW接头的形成、建立搅拌 头 与 焊接 接头 成形关系、解释FSW过程连接机理等。

Results show that CO2 laser welding has advantages of high welding speed distortion free and excellent weld profile with the mechanical property and deep drawing ( cupping ) similar to that of the base metal .

结果表明，使用CO2激光焊接工艺 焊速高，可以获得无变形，成形性良好的焊接接头，其力学性能和深冲加工（杯突试验）均与 母 材相当。

To reveal the influence of forced convection on gas shielded arc welding temperature field the infrared camera was used to investigate the temperature field of the base metal in CO2 arc welding .

为了研究强制对流对气体保护 焊温度场的影响，通过红外热像仪检测了CO2气体保护 焊的温度场，发现在熔池及其邻近区域温度呈圆锥型分布。

The Sn transition zone is narrower than the diffusion layer of TIG direct welding which has brought constraining force on welded joint and hampered the diffusion of Mg element into Al base metal .

锡层对镁铝接头产生拘束强化作用，过渡层比镁铝直接 焊接要狭窄，并且尚余一些没有扩散的锡层，阻止了镁元素向铝 母 材中扩散。

By using this process to repair castings there is no obvious separating line no slag inclusion and gas hole between the welding zone and base metal .

用此工艺焊补铸件， 焊 补区域与 基体间没有明显的熔合线，无渣孔、气孔等缺陷。

This article deals mainly with the influences of three different combinations of welding rod and base metal in welding joints of tube-tubeplate of high-pressure heat devices and diffusion of carbon on both sides of the weld juncture on leakage .

本文着重讨论了高压加热器管子管板焊口三种不同 焊缝 母 材匹配与碳迁移对其泄漏的影响。

Then the welding experiments were carried by the use of selected base metal and existing welding material and the performance deficiency of existing welding material was shown from the tests results .

然后针对选定的 母 材进行 焊接 试验，选择常用焊接材料进行 焊接试验，结果显示现有焊接材料性能的不足。最后针对低温工况的应用，提出 新型 匹配焊接材料的研究思路。

The test results show that the tensile strength and the impact toughness at low temperature of the welding joint are both slightly lower than that of the base metal .

实验结果表明， 焊接接头的抗拉强度和低温冲击韧性都略低于 母 材值。

The results show that the rational welding technique and enough rolling deformation can make the welded area have the similar structure and properties as the base metal .

结果表明，合理的 焊接工艺和足够的轧制变形能够使焊接部位的组织性能与 基体相近，满足使用要求。

The deep penetration Laser welding is the base of extensive utilization for the high-laser welding of metal materials .

激光深熔 焊接是大功率激光焊接 金属材料得以广泛应用的 基础。

Filler materials : For welding base metal matching filler materials shall be used .

填充材料：对于 焊接，应使用与 基材相匹配的填充材料。

This regular deformation had relation with the technology parameters of explosive welding and it directly effected the combining strength of the material and its properties in service . This deformation was the base of metal energy transformation and metallurgy combination .

这种规律的变形与爆炸 焊接工艺参数有关，而且还决定着这类材料的结合强度和使用性能，也是 金属爆炸 焊接能量转换和冶金结合的 基础。

The basic requirement of welding the steel 2205 is that the weld metal and heat-affected zone obtain a favorable phase balance and retain the performance as the base metal after welding .

平衡铁素体和奥氏体两相组织在焊缝金属和热影响区中的比例，保证焊接 接头的性能，是双相不锈钢 焊接的基本要求。

But we found that the distortion of the laser welding joint microstructure is relatively much smaller and because the weld grain presses close to the base metal it has little effect on the coercive force and remained magnetic field strength .

但是采用激光 焊接的焊缝微观组织畸变相对来说小得多，而且焊缝晶粒贴近于原始 母 材，所以对Hc和Mr的影响很小。

After welding cycling the base metal 's microstructure and performance change markedly . At peak temperature 700 ℃ there are lots of cracks along the grain boundary .

经过 焊接热循环作用后， 基体 金属的组织和性能发生显著的变化，峰温达700℃时， 基体 金属中产生了大量晶间裂纹。

To investigate the reason of the great difference in impact toughness of welding seam of high frequency welding pipe samples taken from base metal heat affected zone and welding seam were analyzed through microscopy .

为查明J55钢高频 焊管焊缝处的冲击功差异较大的原因，对 母 材、 焊接热影响区及焊接区进行了微观分析。