采用碱性药皮焊条和焊前接头预热的施焊方法，焊接的空间管道接头热应力小。
For overhead pipeline, welding with basic-compound coated electrodes and pre-welding heating of the joint will reduce the joint thermal -stress.
承包商应于接头安装后一周重新拧紧螺母，并就在轨道最终衬砌和整平前再一次拧紧。
The contractor shall retighten the nuts one week after joint installation and a second time just before final lining and leveling of the track.
需要时，绝缘接头应在轨道最终衬砌和整平前安装。
Insulated joints if required shall be installed just before final leveling and lining of the track.
实施筒体的焊接工艺前，必须验证焊接接头的使用性能，从而证明压力容器筒体焊接工艺的重要性。
Welding joints must be certified before implementation of the welding process, thereby, the improvement of the welding process on barrel of pressure vessel is proved.
金属镍在电渣精炼前需用氩弧焊焊接接长，为保证焊接接头具有足够熔深，需要大参数进行焊接。
Nickel rod needs to be lengthen by argon arc welding before the electroslag refinements, large welding parameters are needed to assure the sufficient penetration.
结果表明，超声波清洗技术效果可靠、经济实用，可用于阀体及管接头的涂装前处理清洗。
The result shows that ultrasonic cleaning technology has good effect and practicability and can be applied to the painting pretreatment of valve bodies and pipe connectors.
某型飞机前起落架后接头连接区为疲劳危险部位，必须准确地估计疲劳寿命。
The joint pontes of the front undercarriage of an aircraft is a fatigue critical part, its fatigue life has to be estimated exactly.
本发明实现了补焊前的预热，补焊接头强度大于熔敷金属自身的强度。
The invention realizes preheating before repair welding, and the strength of a repair welding joint is more than that of the deposited metals.
在进行跑车试验前，先检查焊接质量，如焊接接头所包括的焊缝、熔合区和热影响区等，以设定整个工艺流程；
The frame material and the welding procedure can be set according to the pre-judgement carried out by combining the CAE analysis with the residual stress distribution before welding.
结果表明：采用焊前预热和焊后热处理的焊接工艺方案所获得的焊接接头比不采用以上措施获得的焊接接头更为合理，应用更安全、可靠。
The result shows that it is more reasonable, safe and reliable to adopt procedure with warm up before welding and post heat treatment after welding.
新引入的高性能旋转接头改善并优化了注水泥作业前的井眼清洁效果，带来了完美的泵入及上提打水泥作业。
The introduction of the new high performance swivel improved and optimized the well cleaning before the cement job and this contributed to a flawless pump and pull cement job.
新引入的高性能旋转接头改善并优化了注水泥作业前的井眼清洁效果，带来了完美的泵入及上提打水泥作业。
The introduction of the new high performance swivel improved and optimized the well cleaning before the cement job and this contributed to a flawless pump and pull cement job.
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