Petrochemical construction and efficient welding technology and the current situation

Visit to China National Petroleum Offshore Engineering Company Zhijian Senior Engineer

As competition intensifies, the prices of petroleum, petrochemical construction cycle is short and efficient welding technology, equipment and materials applications is the trend. But efficient welding technology, equipment and materials in petroleum, chemical construction applications, there are still many problems. The following combination of specific projects to talk about the efficient application of welding technology and practical needs, necessity and importance.
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    First, the offshore oil project in the construction of large marine structures. The weight of large offshore oil steel, structure and size of offshore oil development with increasing water depth, marine structures has been increasing, the volume of structures and the use of the plate thickness is increasing. With the rise in steel prices and offshore structures, offshore installation capacity requirements, the application of high strength steel is also a large area using, so that you can reduce the amount of steel. Small marine structures using materials mostly 355MPa even lower intensity level of the material, large-scale structure of 420MPa steel for offshore platforms is increasing the use of proportion. In addition, with the plate thickness increases, bringing a large number of post weld heat treatment of the workload. For example, the offshore platform jacket of a 95mm, φ3750mm ring weld, using double-sided groove (groove depth of 1 / 3, outside the groove depth of 2 / 3), weld metal weight of nearly 271kg, so the use of efficient welding technology, equipment, welding technology and high-performance materials (eliminating weld annealing treatment) is inevitable. Solve the above problem, from two aspects: First, the use of efficient submerged arc welding, the waveform control technology, dual-wire submerged arc welding system (U.S. Lincoln's products); the other hand, high strength, high toughness welding material through the evaluation of weld toughness CTOD test, the abolition of annealing after welding, thus shortening the construction cycle of marine structures.

    Secondly, a large LNG storage tank construction. Large LNG storage tank for the 9Ni steel base metal. The material in the welding parameters welding requires very strict, welding heat input is small, low-temperature layer, which doomed the welding of low efficiency. Therefore, LNG girth welding using submerged arc welding in the horizontal welding, and welding and the use of both sides of the same side welding backing forming welding submerged arc process, using AC square-wave high-efficiency submerged arc welding machine and other new technologies, can effectively improve the welding efficiency.

    At present, China Petroleum and Chemical efficient welding technology gap with foreign countries than not, the new welding equipment, welding and welding materials in the same starting line. Because the current structure in the marine LNG storage projects and large-scale projects using welding equipment and welding materials are mostly imported, welding technology and welding auxiliary facilities with foreign companies is not much difference. But the most crucial question is: those in the field of welding equipment and welding materials and more dependent on imports, our own production equipment and welding materials can not meet the industry's production requirements, but also our welding equipment and welding materials businesses to work together.

    Our company is an offshore steel construction companies, hope that China's welding business with foreign companies to develop a very technical level, even higher level of technology of welding equipment and welding materials, welding technology reduces the high dependence on foreign .
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