先焊炉底板间对接焊缝，由中间往四同辐射对称焊接。
First, weld the butt seams on the bottom plate of the furnace, with radiating and symmetric welding conducted from the central point.
不同的装配—焊接顺序，焊后产生不同的残余变形，一般是先点固，再进行对称焊接。
Different assembly-welding sequence may result different risidual deformation, we usually take fixup by spot welding first, then take welding symmetrically.
由于模型和载荷的对称性，这里取CSP结构中包含一个焊盘的部分进行分析。
As the model and load symmetry here take CSP structure contains a pad part of the analysis.
在多层焊的过程中，采用对称施焊的方法得到的焊接残余拉应力峰值是最小的。
In the multilayer welding process, the method of symmetry welding gets the minimum residual tensile stress.
统计分析了焊接缺陷主要是表现为锡球断路、焊锡过流、锡球分布不对称以及烧焦和锡溅，主要受锡球大小、焊盘相对位置以及有关加工参数的影响。
By statistical analysis, the defects are tin-ball short, overflowing, dissymmetry, splash and scorch, which are mainly affected by the tin-ball size, pad positions, and process parameters .
因此，该些第一侧引脚可与该些第二侧引脚达到长度对称且不会有长侧悬空端，而可 以适用于贴固具有单侧焊垫的晶片。
Therefore, the first side pins and the second side pins can have symmetrical lengths without long side suspension ends and can be suitable for sticking and fixing wafers with single side welding pads.
因此应该在该位置以及与之对称的另一联接点处都应采用周边焊，使角钢连接处的各边全部焊接，然后再与大梁周边焊接。
So the circumjacent welding should be applied at this spot and another join symmetrical to it, all sides of the place at which Angle iron join are welded around with the main beam.
开发了变极性TIG焊电源的微机控制系统，通过调节输出电流的正负半波时间、幅值获得不对称方波。
The controlling system of the variable polarity power source for TIG welding by microprocessor-80C552 is developed with flexible setting time and scope of the DCEP and DCEN.
焊接接头的硬度分布沿焊缝中心基本对称，焊核区硬度较高，热影响区硬度最低。
The microhardness distribution of the welded joint is along the welding line. The microhardness is higher in nugget zone, and lowest in HAZ.
焊接接头的硬度分布沿焊缝中心基本对称，焊核区硬度较高，热影响区硬度最低。
The microhardness distribution of the welded joint is along the welding line. The microhardness is higher in nugget zone, and lowest in HAZ.
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