海洋钻井平台中Q690E焊材的国产化

Localization of welding material on Q690E low alloy high strength steel for offshore drilling platform construction

用于大型浮吊等海工产品的Q690E低合金高强钢焊接时易产生冷裂纹,热影响区受加热速度和冷却速度的影响易形成软化带和脆性组织。焊接时应采用焊前预热、焊后保温和较小的热输入。对比分析国产焊材和国外焊材的化学成分、熔敷金属的力学性能和焊后焊缝金属的力学性能,在可靠的焊接工艺规范下,国产焊材是完全能够替代进口焊材的。

For the large floating crane and other marine products of Q690E high strength low alloy steel welding is easy to produce cohl crack, heat affected zone by heating rate and cooling rate on formation of softening zone and brittle structure easy. Welding shall be used for preheating before welding, welding thermal insulation and heat input. Analyze the weldability of Q690E low alloy high strength steel,analyze and contrast of domestic and foreign welding materials in mechanical property and the mechanical property of deposited metal and weld metal,on the reliable welding craft standard condition,the foreign welding materials which is imported from outside the country can be completely replaced by the domestic welding materials.