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- Preheat before welding and post-heat can obviously diminish welding cracking.As preheat temperature increases, rate of beryllium welding cracking decreases. 焊前预热及焊后缓冷对抑制裂纹作用显著,且随着预热温度提高裂纹率呈下降趋势。
- Preheated before welding 焊前预热
- Disks and filters need to be preheated before use to remove all moisture. 圆盘和过滤器必须在使用前预热，消除所有的水分。
- Conform the material quality after sandblasting before welding & tracing. 在喷砂后焊接前确认材料质量并跟踪。
- Component installation of nodes connected by bolts or welding required inspection Connections after passing before welding or fastening. 构件安装采用焊接或螺栓连接的节点;需检查连接节点;合格后方能进行焊接或紧固.
- The electrodes and fluxes shall be dried according to the requirements, and the grease and rust on wires shall be cleaned before welding. 5焊接前应按规定将焊条、焊剂烘干，焊丝上的油污和铁锈等应清楚干净。
- An easy way to get the door to align correctly is to pre-drill the hort hinge flats before welding on the sides of the shoot (it can be done with careful setup and marking out). 一个简单的方法得到的大门差距是正确对齐预先钻前的拍摄地焊接铰链的园艺单位（可以仔细的做设置和划出）。
- Submerged nozzle must be preheated before casting.Now,burning the coal gas is the usual preheating method. 浸入式水口在浇钢以前必须进行充分预热,利用燃烧的煤气烘烤水口是常用的预热烘烤方式。
- Tanks, vessels, drums, etc., which have contained flammable or toxic liquids will be made safe and the internal atmosphere tested for LEL before welding, cutting, or heating is undertaken on them. 装有可燃性或者有毒液体的槽罐，容器等要保证在用于焊接，切割作业之前安全可用，进行压力测试。
- As a matter of fact, I've never been there before. 事实上我从未到过那儿。
- We started early in order to arrive before dark. 为了在天黑前到达，我们很早就动身了。
- Before mixing with the products of combustion, the air is preheated. 空气在与燃烧生成物混合之前要进行预热。
- The clerk marked up his daybook before going home. 办事员在回家前记好当天的日记帐。
- Let's dunk in the pool before dinner. 我们饭前到池塘里泡一会儿。
- I was inspired to work harder than ever before. 我受激励比以往任何时候都更加努力地工作。
- The fox ran away before the hunter shot it. 那只狐狸在猎人向它射击前跑掉了。
- Let's clean down the board before we paint it. 让我们在上漆以前把这块板洗干净。
- It seemed an eternity before news of his safety reached her. 他平安的消息到达她那里之前，那段时间似乎是无限漫长的。
- Let's collect the sap before its consolidation into a hard mass. 让我们在树液坚固成团之前将之收集起来。
- Before soldering, be sure to preheat components. 焊接前零件一定要预热。
