数字化等离子焊接系统在连续油管钢带对接中的设计与应用

为解决传统等离子焊接平台气囊夹紧力不足、焊枪行走机构精度差、焊接控制系统输出不稳定、无法实时观察问题,以及造成的对接焊缝错边、咬边、焊偏等质量问题,设计了一种数字化等离子焊接系统。该系统通过改进液压夹紧装置、设计焊枪控制系统、熔池监控装置、焊机自动定位装置及气体保护装置,实现了数字化焊接,提升了焊接质量,提高了生产效率。实际应用表明,采用设计的数字化等离子焊接系统,生产效率提升15%以上,斜焊缝一次通过率提高约8%。

Investigation on the Dynamic Responses of a Truss Spar Platform for Different Mooring Line Groups

The dynamic responses of any floating platform arc dependent on the mass, stiffness and damping characteristics of the body as well as mooring system. Therefore, it is very essential to study the effect of individual contributions to the system that can finally help to economise their cost. This paper focuses on the effect of mooring stiffness on the responses of a truss spar platform, obtained by different grouping of lines. The study is part of our present researches on mooring systems which include the effect of line pretension, diameter and azimuth angles. The platform is modelled as a rigid body with three degrees-of-freedom and its motions are analyzed in time-domain using the implicit Newmark Beta technique. The mooring lines restoring force-excursion relationship is evaluated using a quasi-static approach. It is observed that the mooring system with lines arranged in less number of groups exhibits better performance in terms of the restoring forces as well as mean position of platform. However, the dynamic motions of platform remain unaffected for different line groups.

某大型屋面网架空中组对安装新工艺

某24 740 m2车间距竣工只有4个月,若屋面网架采用常规方法安装,工期必延期3个月。利用厂房行车梁做载体,安装好轨道后采用贝雷行架移动式平台进行网架拼装,地面工程可正常组织施工。该方案工期和经济的优势比较明显,具有较好的推广价值。