焊接的

If one square inch of copper is used as a heat dissipator for the TO-252, the J-A drops to approximately 50C/W. The SOT-223 package has a J-A of approximately 125C/W when soldered down to a minimum sized pattern (less than 0.1 square inch) and approximately 70C/W when soldered to a copper area of one square inch.

如果一平方英寸的铜是作为的TO - 252热消使用时，司法机构政务长下降到大约50 / W的的SOT - 223封装具有的司法机构政务长大约125C / W的焊接时下跌不到0.1平方英寸的最小尺寸为1型和大约70 / W型焊接时，一铜一平方英寸面积。

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。

We are in need employees with skill sets in Skilled Mig Welder/Fabricators x2 Skilled Heavy Vehicle Repairers experienced in Mig Welding x 2 Skilled Coach Fitters and Finishers.x2 Skilled Panel and sheet metal workers x2 experienced in Tig Welding Skilled Heavy Diesel Mechanic/Fitter x1 Timing is of the utmost importance .

我们是在需要雇员以技巧持续熟练的Mig Welder/Fabricators x2 熟练的重的车修理匠被体验在Mig 焊接x 2 熟练的教练钳工和Finishers.x2 熟练的盘区和金属板工作者x2 被体验在Tig 焊接熟练的重的柴油Mechanic/Fitter x1 时间最重要。

At the same time, the gas flow acting on the keyhole is simulated by finite element method. The gas flow fields of pneumatic circumferential motion and pressure distribution nephograms around and in the keyhole are obtained. Analysis shows that when plasma is blown backwards i.e., in direction towards the trailing edge of the weld pool, plasma can be eliminated better.

利用有限元法对激光焊接时保护气体在小孔内部和表面气流状况进行了数值模拟，通过对不同焊接条件下模拟形成的小孔气动扰流的气流场和压力分布云图的分析，解释了采用逆向侧吹保护气体吹除等离子体的方法，可以更有效地抑制等离子体云的产生，防止小孔塌陷，有利于维持小孔的稳定性。

The relevant spot welding parameters for every kind of zinc-coated steels were proposed.

为了在需点焊加工的产品上推广使用镀锌钢板，并保证其焊接质量，本文对普通冷轧钢板、电镀锌钢板和两种不同锌层厚度的热镀锌钢板进行了一系列点焊工艺及力学性能试验，并通过对试验结果的数据处理和理论分析，找出了几种材料点焊工艺性能上的差异，得出了一套合适的点焊焊接规范范围。

Equipments of the key parts of welders, such as transformers and its accessory parts, are in the leading position nationwide. Also we have accurate processing and highly automatic production lines for transformers, silicon steel sheet, wire winding, assembling, impregnating varnish and drying. The design,manufacturing, and testing for PCBA and the overall units have reached the domestic advanced level.

其中，电焊机关键零部件焊接变压器及附件的加工装备水平处于国内领先地位，同时拥有国内焊接行业领先的变压器生产、变压器硅钢片加工、绕线、焊装、浸漆、烘干等加工精度高、自动化程度高的生产流水线；PCBA线路板的设计、制造、测试及整机制造、测试的能力均为国内先进水平。

And this paper introduced the principium, design ideal and approach of waveform presetting of waveform controlling at will The function of relevant hardware circuit controlling was design in this paper uses litter content RLC surge circuit in simulating the current signal of energy storage welding, and took it as Ug to control the inverter cap energy storage spot welding machine. It realized HFPEC resistance spot welding with hardware circuit and got the effect as good as the system controlled by industrial computer and realized the customization and the low cost of welding machine.

本文所设计的相应硬件控制功能，采用小容量RLC 放电回路来模拟输出储能焊过程的电流波形，由此作为电流给定信号直接控制逆变式电容储能点焊电源，实现了完全由硬件电路构成的高频脉冲电阻点焊，能够获得焊接设备的专用化和低成本化的结果，并且可以得到与工控机控制系统相当的焊接效果。

In shaft hole ensures the key requirement in coaxiality of holes.

采用国际领先的制造工艺，端板与桶体的焊接加工均采用整体退火处理，防止焊接后的&应力变形&；利用大型镗床加工端板轴孔，确保了轴孔的同轴度的关键要求，使产品的

This paper studies the effect of consequent post heat treatment on the mechanical property and shape memory ratio of the welded TiNi joints in TiNi shape memory alloy precise pulse resistance butt welding,analyzes the joint structures and fractographies affecting mechanical property and shape memory ratio of welded joint by using strength testing, SEM and TEM, gets the optimum welding parameters obtaining good shape recovery ratio welded joint, and has discovered the inherent reason for proper consequent post heat treatment to promote the joint shape recovery ratio from microcosmic point.

摘 要：采用拉伸测试、SEM、TEM和定点成分能谱分析等手段研究了随机后热处理对TiNi形状记忆合金精密脉冲电阻对焊焊接接头力学性能、形状恢复率的影响，并对影响接头力学性能和形状恢复率的接头组织和形貌进行了研究，得出了获得具有较高形状恢复率接头的焊接参数，从微观角度揭示了随机后热处理提高接头形状恢复率的内在原因，为TiNi形状记忆合金的开发和应用提供了基础，具有重大的理论和实际应用价值。

Analyzing the dynamic behavior of dislocations in the deformed metal at high temperature and high strain rate, a new theoretical model of dislocation dynamic behavior is put forward to describe the dynamic recrystallisation mechanism of the weld metal.

采用本文首次提出的测量摩擦界面温度的半自然热电偶测温法，并结合焊接过程中的急冷凝结组织分析、微区应变速率分析，以及摩擦扭矩测量等相关实验方法，测定了焊接过程中焊合区金属的组织及相应的热变形参数。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。