螺旋钢管成型方式与内应力关系的研究

Analysis And Research of Spire Steel Tube Remnant Stress

螺旋钢管因其制造工艺成熟、成本较低 ,是流体输送管道主要使用的一种钢管。目前普遍采用连续成型、埋弧焊接的方法制造螺旋钢管。成型方法有内承式和外抱式两种。由于这两种成型方法一般都是不足量成型 ,钢管制造后有很大的内应力 ,降低了钢管的承压能力。分析了这两种成型方法产生内应力的原因 ,内应力与成型参数之间的关系 ,以及改进成型方法、减少内应力的措施。经过理论分析 ,给出了不足量成型时钢管的内应力计算公式 ,并通过实际测量内承式成型的螺旋钢管的内应力 ,验证了给出的内应力计算公式的正确性 。

Spire steel tube,for manufacture technology maturation and low cost,has become one of the main application fluid transportation pipeline.Now to widespread adopt continuous MAW(merge arc welding) method produces spire steel tube.Forming methods have inner hold and outer hold.Because the two methods don't commonly sufficient quantum mold, they have great remnant stress after manufacture,reduce the capability of bearing pressure.By theoretical analysis,give unsufficient quantum forming remnant stress calculation formula.By practical measure inner hold forming spire steel tube remnant stress,it validates the accuracy of remnant stress calculation formula of the paper and has directive significance of appliance and manufacture toward spire steel tube.