海洋平台大厚度焊接接头断裂韧度

Fracture toughness for large welded joints in offshore platform

摘要: 依据BS7448断裂韧度试验标准(ISO/TC164/SC4-N400),对采用埋弧焊(SAW)工艺施焊的、板厚为54 mm的海洋石油平台大厚度对接接头试样进行了低温裂纹尖端张开位移(CTOD)试验。分别测试了-15℃下单丝和双丝埋弧焊工艺下焊缝金属和热影响区的CTOD值。试验表明,除双丝埋弧焊热影响区试件外,其余试件均满足挪威船级社DNV规定的最小特征CTOD为0.15 mm的要求,为指导海洋平台的施工建造提供了科学依据。

Abstract: The measuring and testing technique of crack tip opening displacement (CTOD)tests for large welded joints in the offshore platformunder low environmental temperatures of -15℃ were performed in accordance with the BS 7448 standard(part2, 1997).The CTOD tests on the weld metal and heat affected zone were conducted for the welded jointswith a thickness of 54 mm welded by single electrode and twin electrode of submerged-arc welding technology respectively .The testing results provide judgements on whether the joints need postweld heat treatment.