外文翻译--船舶焊接精选.docVIP

Welding is to ensure that the ship of the ship and the strength of the key. This paper describes the ship in the welding of several common reasons for the shortcomings and propose preventive measures. Welding is to ensure that the ship of the ship and the strength of the key is to ensure that the key to the quality of the ship, is to ensure the safety of ships navigating and operating an important condition for. If there is a welding defect, it may cause structural faults, leakage, or even cause the ship sank. According to the ship brittle fracture accident investigation showed that 40 percent of brittle fracture from the accident was the beginning of the weld defects. Ships in the township in shipbuilding, ship the welding quality is particularly prominent. In the inspection of ships in the process of welding the test is particularly important. Therefore, should the early detection of defects, the welding defects restricted to a certain extent, to ensure navigational safety. Many types of ship welding defects, according to their different positions, the defects can be divided into external and internal defects. Defects have pores, slag, welding cracks, lack of penetration, not fusion, weld and shape of Dimension are not met, the biting edge, of welding, such as arc pit. first stomatal pore stomatal pore means that the welding, bubble bath in the solidification of the failed escape the hole formed. The main reason there have stomata: groove edge of dirty, water, oil and Xiuji; electrode or not provisions of curing flux, solder or rust-core skin degeneration, such as spalling. In addition, low-hydrogen welding electrode, the arc is too long, welding too fast; submerged arc welding voltage too high, are easily generated in the process of welding stomata. Because the presence of porosity so that the seam of effective cross-section decreased, too large pores will reduce the strength of welds, the destruction of the weld metal density. Prevention is to have a stoma: c