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.
本文提出了一个统一的二维轴对称焊接残余应力场的简化计算模型。
A unified simple model is proposed in this paper for the computation of 2-d axisymmetrical residual stresses of welding.
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.
起始裂纹在硬区的软对硬力学性能非对称焊接接头，起始裂纹越靠近软区，疲劳裂纹扩展速率越慢；
For CH joint, when the initial crack is located in hard zone, the closer the initial crack is to the hard soft interface, the slower the fatigue crack growth rate is.
阀体对称，尤其是焊接阀体结构，能很好地承受来自管道的应力。
Body symmetry, in particular welded body structure, well under the stress from the pipe.
介绍了对称碰撞爆炸焊接的实验方法，总结了它的实际应用。
The experimental research on explosion welding through symmetric collision was conducted and new app-(lications) proposed.
本船为铝合金焊接双体客船，采用对称片体，单层甲板，设上下客舱，螺旋桨推。
This ship is an aluminum alloy welded catamaran passenger vessel, using symmetrical semi-hull, single deck, upper lower cabins and propeller driven.
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.
摘要进行了几种金属组合的对称碰撞爆炸焊接试验。获得了这些金属组合中的飞线—绝热剪切线。分析了这种飞线产生的工艺、原因、性质和影响。
Some tests with many sorts of metals combination under symmetrical impact explosion welding were studied, and a sort of flying line-adiabatic shear line in those metals combination was obtained.
采用平行焊接技术，实现每个机头两块压钳同步对称进给，焊接角强度更高；
Parallel welding makes profile-clamps synchronously and symmetrically feeding forward; high corner strength.
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 .
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.
护手必须以刀为中心对称，焊接装配干净美观，没有结块，洞眼或空隙。
The guard must be symmetrical and centered on the blade (side to side). Solder fittings shall be clean and appealing, free from lumps, holes, or voids.
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.
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.
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