焊接专业外文翻译---水下焊接技术发展史

外文资料翻译

HISTORY OF UNDERWATER

WELDING TECHNOLOGY

Underwater welding technology is the development of the marine, offshore oil exploitation as well as assembly, maintenance such as oil platforms, pipelines and submarine positions in large marine structures such as one of the key technologies, but also ships emergency repair, salvage, construction of bridges and other necessary technically work means. Nuclear power development is the trend of the world in nuclear power plants within the reactor pressure vessel (RPV) for long-term work in the water, susceptible to stress corrosion cracking of the damage, structural repair of nuclear power, will face many challenges. Tooften use radiation-related underwater welding method, in order to reduce the working staff. Classification of underwater welding underwater welding generally divided into three categories: wet, dry, and local dry. And the dry can be divided into high-pressure dry underwater welding and common-pressure underwater welding pressure. Local laws, including drainage cover dry type, high-pressure curtain-style, steel brush, mobile air box and plasma arc MIG local dry method. Welding method used generally coated electrode welding, GTAW, GMWA, and FCAW. In addition to welding underwater welding in addition there is an explosion welding and FSW (friction stitch welding friction stitch welding), these two methods are all connected by solid phase technology. Following the development of underwater welding course:

1 Underwater wet welding technology

In 1802, a scholar named Humphrey pointed out that a continuous arc can burn under water, that pointed out the possibility of underwater welding, but its practical application is more than 100 years later, can not move the structure on land welding was done under the circumstances. The first published an article about underwater welding research papers in 1933, was jointly by Hibshrman Jensen and complete. 1932, Khrenov invented the thick skin of underwater medicine special electrode, the electrode surface top coat with waterproof layer, so that the stability of underwater welding arc has been improved to some extent. To the Second World War, underwater welding technology has been in the salvage boat, etc. play an important role. In 1971, Humble Oil Company of the Gulf of Mexico drilling platforms, underwater welding repair work is the first underwater welding technology used in offshore oil projects. 1985 produced the first batch of accredited diving welder, and developed a depth of less than 100m underwater wet welding. In 1987, underwater wet welding stainless steel piping in nuclear power plant has been applied to the repair work. 90's of last century, with the required repair of underwater engineering structures and the increase in the cost of increased repair dock, wet welding technology has been further developed. The development of underwater welding underwater wet welding plays an important role in the application. British Hydroweld a variety of underwater welding company achieved good practical results. U.S. Patent electrode -7018 `s drug electrode layer of aluminum skin, underwater welding can produce large amounts of gas, to avoid the erosion of the weld metal. University of Hanover, Germany-based slag - gas combined protection of the metal transfer process and protective mechanism developed from the protection of double-cored electrodes. Underwater wet welding is usually the water depth of less than 100 m, the direction of current efforts is to achieve 200 m water depth of wet welding technology breakthrough. Early 50s of last century,