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y for the welded joints in these structures which are exposed to high complex loads , is required (Refs .1-8). Figure 2 represents the welded joint shapes of thick sheet metals with and without joint preparation that are most frequently used in both shipbuilding and other steel structures. The weld joints can easily be made with conventional methods such as gas metal arc welding (GMAW).In shipbuilding, the GTAW process is used for welding highly alloyed steel and aluminum, especially in catamaran and yacht building. However, thick sheet metal welding joint preparation can only be manufactured with high-intensity arc welding methods such as electron beam and laser beam welding, as exhibited in Fig .2 in Fields III/1-3.
Generally, plate thicknesses, welding methods to be applied , and dynamic loads affecting marine structures determine the selection of the weld shapes. In addition, the choice of the weld shape strongly affects the welding process and the manufacturing costs. Minimization of joint volumes, renouncement of joint preparation , and omission of pre-and post treatment of welded joints reduce manufacturing costs of marine vessels and structures. These topics have been the subject of investigations around the world . Efficient welding power sources, new welding methods, and new welding techniques are also being tested . Furthermore, fatigue strength of welded joints subjected to operating loads has been intensively examined (Refs.1-12).

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y for the welded joints in these structures which are exposed to high complex loads , is required (Refs .1-8). Figure 2 represents the welded joint shapes of thick sheet metals with and without joint preparation that are most frequently used in both shipbuilding and other steel structures. The weld joints can easily be made with conventional methods such as gas metal arc welding (GMAW).In shipbuilding, the GTAW process is used for welding highly alloyed steel and aluminum, especially in catamaran and yacht building. However, thick sheet metal welding joint preparation can only be manufactured with high-intensity arc welding methods such as electron beam and laser beam welding, as exhibited in Fig .2 in Fields III/1-3.
……焊接连接应用于承受复杂载荷的结构。图二为常用于造船业以及其他钢结构的有/无接头坡口准备的厚鈑金焊缝形状说明。此焊接接头容易加工，仅常用的co2保护焊即可胜任。氩弧焊常用于造船业尤其双体船及快艇中高合金钢、铝合金的焊接。厚鈑金坡口仅能用高强度弧焊工艺加工，如电弧焊及激光焊。见Field iii图二。
Generally, plate thicknesses, welding methods to be applied , and dynamic loads affecting marine structures determine the selection of the weld shapes. In addition, the choice of the weld shape strongly affects the welding process and the manufacturing costs. Minimization of joint volumes, renouncement of joint preparation , and omission of pre-and post treatment of welded joints reduce manufacturing costs of marine vessels and structures. These topics have been the subject of investigations around the world . Efficient welding power sources, new welding methods, and new welding techniques are also being tested . Furthermore, fatigue strength of welded joints subjected to operating loads has been intensively examined (Refs.1-12).
通常海洋装备的焊缝形状由板厚、焊接方式等决定。另外焊缝形状的选择对焊接工艺及制造成本有着重要的影响。容积最低化、免坡口及免焊前焊后处理等都是节省海洋装备、船舶制造成本的有效方式。这也已是全球调查科目。且正试验高效焊机电源、新型焊接方式及技术。此外，焊接接头工作载荷引起的疲劳强度检验也正加紧研究。

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