Shortcomings of LSAW Steel Pipe

[1] Constituting the uneven cooling of residual stress. Residual stress effect in the absence of an external force from the internal equilibrium of stress, has a cross-section of various hot-rolled steel such residual stresses, the greater cross-sectional dimension is usually steel, the residual stress is Although the greater the residual stress from equilibrium, but still there is a certain effect on the steel member function in terms of external effects such as deformation, stability, anti-fatigue effects are bad luck can happen.;

[2] After the via welding, lsaw steel pipe inside nonmetallic inclusions are pressed into the sheet, showing the hierarchical representation. Stratified straight pipe joints so that the thickness direction of the tension function deteriorated significantly, and there can be reduced when the weld torn between the presentation layer. shortened weld induced strain portion reaches the yield point strain often several times larger than the load caused by the strain.