焊接的

Based on the application of gas pressure welding in multilayer structure, the authors sum up construction experience, including selection of weld parameter, con- sideration needed in operation and test methods of weld points, and point out the direction of far- ther improvemrnt.

结合气压焊接工艺在多层框架结构上的应用，总结了施工实践中的经验，包括焊接参数的选择、操作注意事项、焊接接头的质量检验及今后在应用中需不断充实完善的新课题等。

From the USA and Thailand has one of cola companies TECHALLOY of nickel-based welding materials, the United States Oxford Oxford special welding consumables company, USA Miller Electric Company Miller Welding Power Supply, Germany Siegfried Siegmund Mans and Germany Forster Foster's three-dimensional flexible welding table, as well as Germany's Express AMF fixture and hydraulic clamping system.

其中有来自美国泰可乐公司TECHALLOY的镍基焊接材料，美国牛津公司Oxford的特殊焊材，美国米勒电器公司Miller的焊接电源，德国西格芒Siegmund公司和德国福斯特FORSTER公司的三维柔性焊接工作台，以及德国 AMF 公司的快速夹具和液压夹紧系统。

Energy deposition at the interface of the particles caused by micro-explosive welding in explosive consolidation of metal powders is analyzed by symmetrical impaction model of uncompressible liquid. Two-dimensional equation of energy in the flow field of explosive welding is deduced and solved by finite difference method. Then the distribution of the temperature in the flow field is calculated on the basis of considering the adiabatic compression.

摘 要：以不可压缩理想流体对称碰撞模型对金属粉末爆炸烧结中由微爆炸焊接引起的颗粒界面附近沉积的能量进行了分析，在考虑热传导效应的基础上推导出了焊接流场中二维形式的能量方程并用有限差分法对其进行了求解，在考虑冲击绝热压缩贡献的基础上计算出了焊接流场中的温度分布。

The results show that mechanical heterogeneity has great influence on the J-integral of welded joint containing transverse crack. The J-integral on the path cross the interface between welded joint and base metal is higher than the J-integral on the paths in the weld metal for undermatched joint,while the J-integral on the path cross the interface between weld metal and base metal is lower than the J-integral on the paths in the weld metal for overmatched joint. Moreover,the difference of J-integral values increases with the increasing of the load and strength mismatching difference and the path-enclosed length of interface between weld metal and base metal.

计算结果表明：力学不均匀性对含横向裂纹焊接接头的J积分有重要影响，低匹配焊接接头中积分路径穿越焊缝与母材界面的J积分值高于积分路径在焊缝内的J积分值，高匹配焊接接头中积分路径穿越焊缝与母材界面的J积分值低于积分路径在焊缝内的J积分值；载荷越大，焊缝与母材的强度差别越大；积分路径中包含的焊缝与母材界面长度越大，J积分的差值越大。

In the condition of big practical extruded 6005A alloy welded joint, the softing degree of mentioned above soft zone obviously decreases, attributed to that there is a reinforce rib which have obvious heat scatting action, and then decreases the temperature increasing during welding.

对进口的6005A大型多孔铝型材焊接接头进行分析，发现焊接接头上软化区硬度降低的程度明显较小，这是由于实际的多孔型材在该部位设置有加强筋，加强筋有显著的散热作用，降低了焊接过程中该部位的温升。

It greatly reduces the noise from the discontinuous spectrum in the arc and adapts to the seriously fluctuating welding current during the process and obtains the clear images of the welding pool using common industrial CCD camera.

在对铝合金焊接光谱分析的基础上，以焊接电弧光中的连续光谱作为光源，采用宽带滤波方法设计的全新的光学图像传感器，利用普通工业CCD摄像机获得了画面清晰、质量稳定的铝合金焊接熔池区域图像。

Through collection of TIG welding arc light spectrum of steel with disturbing factor,this paper studied the effect of disturbing factors such as rusty and various gas flow rate on the arc light spectrum distribution.Furthermore, the light radiation of different spectral zones was studied to get the spectral signals that could reflect the disturbing factors which were critical for online welding quality control.

通过对干扰因素下TIG焊电弧的光谱信息进行采集，研究了气流量变化、焊接试件表面存在锈等干扰因素对焊接过程电弧光谱分布的影响，并基于光谱分布的分析，进一步探讨了不同光谱谱段对干扰因素的反映，寻求实现焊接过程质量在线光谱测控的理论依据。

ABSTRACT The research of metal transfer in metal gas arc welding is of great significance for the control of arc welding process and quality, the improvement of existing welding technology and the development of new welding equipment. With the powerful aid of welding arc spectrum which contains plenty of information of metal droplet transfer, this dissertation, which mainly aims at putting forward an effective detecting method with arc spectrum signal, has inspected the spectrum of metal gas welding arc and discovered their dynamic characteristics of each kind droplet transfer mode.

熔化极气体保护焊熔滴过渡的研究，对于焊接过程及质量控制、焊接工艺方法的改进和新型焊接设备的推出都具有重要意义，而熔化极气体保护焊电弧光谱中含有丰富的反映熔滴过渡的信息。

And then, they, how to upgrade the technical capability of inverter welding power supply by bringing the dominance of digital control into play fully, and how to realize the soft-switching of power semiconductor devices in the full-load range of inverter welding power supply by making the digital control cooperation with power converter closely, are set forth.

在介绍数字化控制焊接逆变电源内涵和发展历程的基础上，阐述了如何充分发挥数字化控制的优势，全面提升焊接逆变电源的工艺性能，以及如何通过数字化控制和功率变换电路的紧密配合，实现焊接逆变电源的全负载范围功率器件软开关。

Effects of arc welding processes,welding parameters as well as chemical compositions and mechanical properties of the base metal on arc efficiency ,melting efficiency and heat input for fusion welding processes are analyzed.

介绍了电弧焊过程热效率的物理含义及熔焊过程热效率的研究概况，比较了不同熔焊过程的热效率，分析了焊接方法、焊接参数及母材成分与性能对熔焊过程的电弧热效率、熔化效率及焊接热输入的影响规律。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。