从控制成型残余应力峰值和合缝预焊后管口椭圆度的角度出发综合考虑，将管坯成型为扁椭圆较为合理。
It is reasonable takes shape the unfinished piping to the flat ellipse for reduce the remaining stress peak value and ellipticity.
从控制成型残余应力峰值和合缝预焊后管口椭圆度的角度出发综合考虑，将管坯成型为扁椭圆较为合理。
It is reasonable takes shape the unfinished piping to the flat ellipse for reduce the remaining stress peak value and ellipticity.
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