Third of the world "pattern.

China's shipbuilding capacity is currently about 500 million dwt, accounting for 5% -6% of the world, is expected in 2005 up to 800 million dwt or higher, accounting for 12% -15% of the world.
Since the reform and opening up the technical level of China's shipbuilding industry, ship type, construction quality and construction cycles have made considerable progress, with a certain degree of international competitiveness. Ships welding technology which contribute to the rapid progress of outstanding
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And achieved a better economic efficiency.
1.1 Application of shipbuilding production methods and efficient welding technology
These highly efficient welding method from the late 20th century, 70 3-5 35 kinds of development to the present species, the basic construction to meet the export of ships, offshore oil platforms and the needs of various non-marine products.
Rate of 1.2 greatly improve welding efficiency
Welding mechanization and automation rate since the 20th century, 90 years after the increase has been more substantial, as shown in Figure 1
1.3 shipyard welding equipment becoming more and more reasonable and constitutes a rotating DC arc welding machine from 56.45% in 1983 down to 65% in 2001, the final will all be eliminated, replaced by a rectifying arc welding machine, CO2 gas shielded welder , AC welder,

Marine mechanized submerged arc welding machine and welding automation straight angle, vertical gas welding and so on. As a result of welding power supply can be energy efficient to save electricity each year in Table 1.
1.4 Ships new welding techniques, new technologies, new materials and promotion
Features the shipyard is a multi-species, small quantities, frequent changes in product mix and material. In recent years, with the conversion of modern shipbuilding mode, and vigorously promote regional shipbuilding method to make the ship welding technology has also undergone a big change, which compares

Some of the key outstanding are the introduction of foreign shipyards have advanced sub-assembly and welding line plane, using the puzzle-station multi-wire submerged arc welding side welding forming new techniques, new equipment. The welding range for 5-20mm, respectively, and 10 -

35mm marine docking puzzle sheet, while the theory of shipbuilding by region under the guidance of the plane section of the hull structure of the assembly and welding also uses a semi-automatic or automatic gas shielded welding process so that the welding angle efficiency is greatly improved.
National Taiwan University for the ship, the vertical closure of the joints (length 15-30m) of the welding, the original set of manual arc welding process, the drawback is the low productivity, labor-intensive, technically demanding operation of the welder, welding quality is unstable. China-made

Shipping industry, the mid-80s from the 20th century began to use CO2 gas-electric vertical automatic welding process, welding, placed back in the trapezoidal groove weld ceramic backing, weld a positive force formed by water-cooled copper block in order to maintain stability and pool good weld, the

Efficient than conventional welding production  increased 5-7 times the manual welding, welding quality and stability, has been in the major shipyards are universally applied.