焊后热处理对海洋平台用钢焊缝低温断裂韧性的影响  

Effect of post weld heat treatment on low temperature fracture toughness of steel welded joints of offshore platform

作　　者：王金生 温志刚 陈英 舒欣欣 李维锋 

机构地区：[1]海油工程建造公司,天津市300452

出　　处：《焊接》2016年第7期48-52,71,共5页Welding & Joining

摘　　要：分别采用焊条电弧焊(2G,3G)、CO2气体保护焊(2G,3G)与埋弧焊(2.0 k J/mm,3.5 k J/mm)工艺得到板厚分别为80 mm,80 mm,100 mm焊接接头。将试样均分为两组,根据英国BSI 7448—2005《断裂韧性试验标准》,分别进行焊态和热处理态低温断裂韧性(CTOD)测试。结果表明,相同热处理工艺对不同焊接方法焊缝中心线CTOD值影响不同。FCAW接头的低温韧性对热处理敏感性较低,热处理前后2G与3G位置的CTOD值都基本不变;埋弧焊接头断裂韧性提升幅度较小,低热输入下CTOD约提高5%,高热输入下约提高32%;焊条电弧焊2G和3G位置CTOD值分别提高14.15倍和1.5倍。试验结果为评价这几种焊接方法和相应板厚焊接接头的免除热处理提供了一定依据。The welded joints of plates with thickness of 80 mm,80 mm,100 mm were obtained using shielded metal arc welding( 2G,3G),carbon-dioxide arc welding( 2G,3G) and submerged arc welding( 2. 0 k J / mm,3. 5 k J / mm) process,respectively. The specimens were divided into two groups. Low temperature fracture toughness( CTOD) tests were carried out on the welded and heat-treated specimens based on BSI 7448( 2005),respectively. The results show that the same heat treatment process has different effects on CTOD values of the weld centerline with different welding methods. The FCAW joint has a lower sensitivity to low temperature toughness,and CTOD values of 2G and 3G positions before and after heat treatment are essentially equal. Fracture toughness of the submerged arc welding joint has a smaller increase,CTOD value at low heat input increases by about 5%,CTOD value at high heat input increases by about 32%,and CTOD values of 2G and 3G positions with shielded metal arc welding increase by about 14 times and 1. 5 times,respectively. The test results provide a basis for the evaluation of these welding methods and the welded joints with corresponding plate thickness.

关 键 词：热处理 导管架 裂纹尖端张开位移(CTOD) 

分 类 号：TG404[金属学及工艺—焊接]