| 王飞1，许根富1，吴晋桃1，陈 涛1，狄艳敏2.未焊透缺陷安全尺寸的评价研究[J].轻工机械,2016,34(4): |
| 未焊透缺陷安全尺寸的评价研究 |
| Study on Safety Depth of Piping Containing Incomplete Welding |
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| DOI：10.3969/j.issn.1005 -2895.2016.04.006 |
| 中文关键词: 压力管道 未焊透缺陷 极限载荷 非线性分析 安全尺寸 免于评定 |
| 英文关键词:pressure pipe incomplete welding defects limit load nonlinear analysis margin size safety assessment |
| 基金项目:国家质量监督检验检疫总局科技计划项目( 2014QK158)；浙江省质监系统科技计划项目（20150236）。 |
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| 中文摘要: |
| 未焊透是压力管道焊接接头常见缺陷之一，严重时会导致管道的承载能力明显降低，进而引发严重的安全事故。
目前我国的《在用工业管道定期检验规程》中对未焊透管道的定级是很保守的，为了减少对未焊透缺陷的返修，文章采
用非线性有限元分析的方法，通过简化未焊透管道的影响因素，并研究在不同载荷工况下管道失效模式与缺陷尺寸的关
系，获得了未焊透管道的极限载荷曲线簇；再运用塑性力学分析方法对有限元分析结果进行筛选，得到了焊接缺陷的安
全尺寸；最终通过试验验证极限载荷数值分析结果的合理性。研究结果表明含有超标焊接缺陷（如未焊透）的管道不通
过复杂应力计算和安全评定即可在保证安全前提下最大限度地使用。 |
| 英文摘要: |
| Incomplete welding defect is one of the common defects in the welded joint of the pressure pipeline, which can
lead to a significant reduction in the carrying capacity of the pipeline, which can further result in serious safety
accidents. Aiming at the conservation and localization for dividing grade of incomplete welding defect, the nonlinear
finite element analysis method was applied in the paper to simplify influencing factors of incomplete welding, the limit
internal pressure and ultimate moment with incomplete welding depth, ring to the variation of the length and other factors
were further studied, to get the limit load curve clusters; The new margin depth had been obtained and the grade scope
of dividing grade of incomplete welding defects in ' Regular inspect criterion for in-service industrial pipelines' was
verified. The results of this research and analysis can provide reference to the safety assessment of pressure piping
containing incomplete welding defects. |
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