为满足某大型海洋平台模块钢结构焊接的需要,采用SMAW和SAW焊接工艺对S420MLO材料进行焊接试验和力学性能试验.在试验过程中,通过裂纹尖端张开位移(Crack Tip Opening Displacement,CTOD)试验进行焊接工艺评定.试验结果表明,在焊材选用合理、焊接工艺得到严格控制的情况下,通过焊前预热和焊后消氢处理,能获得良好的焊接接头性能,满足相关标准及项目文件的要求,避免对大型钢结构进行焊后热处理.
Welding Process of S420MLO Material
To weld module steel structure of a large offshore platform,welding tests and mechanical performance tests on S420MLO material with SMAW and SAW welding processes were carried out,and the crack tip opening displacement(CTOD)test was conducted for welding process evaluation.The results show that,with reasonable selection of welding materials and strict control of welding process,good welding joint performance can be obtained by preheating before welding and hydrogen elimination treatment after welding,meeting the requirements of relevant standards and project documents,and avoiding post-welding heat treatment of large steel structures.
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