In the past few decades, interest in deepwater oil and gas exploration has received increased attention. China intends to explore resources in the South China Sea, and in order to lay oil and gas pipelines, a variety of high-quality and efficient welding technologies have been developed that use the gas metal arc welding (GMAW) process, which is currently widely used in industrial applications. Besides pipeline laying, automated welding also can be applied in some other offshore operations, such as the J-type laying in the welding installation of steel catenary risers (SCR). In this investigation, automatic pipeline welding equipment was manufactured and welding parameters were developed. Several conclusions are drawn as follows: (1) The two vehicle, two gun technology utilized in the welding workstation significantly reduces the cost of offshore welding operations. (2) The welding vehicle was compact and light weight, which helps meet special requirements for subsea pipeline laying. (3) Several advanced technologies were adopted in the control system of the automatic welding equipment, such as synchronization of two traveling motors, vehicle computation, and all-position welding. (4) The control system was designed based on CAN-bus technology, which not only reduces the connection cables, but also makes the welding system more flexible. (5) Copper liners for the root welding ensured good weld backing and a high welding efficiency. (6) A specially designed narrow groove improved welding efficiency and reduced the amount of weld metal needed. (7) The joint was completed with a root pass, two fill passes, and one cap pass. Welding parameters were set depending on the different positions of the welding vehicle, which were measured by a tilt sensor installed on the vehicle. (8) Pipe girth welds produced by the dual vehicle, dual welding gun equipment met all requirements of API STD 1104-2005, such as visual, ultrasonic, and mechanical performance testing. (9) After the experiment in the laboratory and before the sea trial, the automatic welding equipment was tested successfully in a fabricating plant. (10) The welding sea trials were successfully carried out in the China Sea, and all girth welds were tested by ultrasonic inspection.


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    Titel :

    Automated welding applied in deep-water pipelines


    Beteiligte:
    Xiang-Dong, Jiao (Autor:in) / Zhou, Can-Feng (Autor:in) / Chen, Jia-Qing (Autor:in) / Ji, Weng-Gang (Autor:in) / Li, Zhi-gang (Autor:in) / Zhao, Dong-Yan (Autor:in) / Jun, Cao (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2013


    Format / Umfang :

    3 Seiten, 6 Bilder, 5 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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