Thaum cov yeeb nkab raug rau sab hauv, ob qhov kev ntxhov siab tseem ceeb feem ntau yog tsim los ntawm cov yeeb nkab phab ntsa, uas yog radial stress δY thiab axial stress δX. Qhov tshwm sim ntawm qhov kev ntxhov siab ntawm qhov vuam yog δ=δY(l/4sin2 ntxiv rau cos2 )1/2, qhov twg yog lub kaum sab xis ntawm lub vuam ntawm cov kav welded.
Lub helix lub kaum sab xis ntawm cov kauv welded yeeb nkab weld feem ntau yog 50-75 degrees, yog li qhov kev ntxhov siab hluavtaws ntawm cov kauv welded seam yog 60-85 feem pua ntawm cov kev ntxhov siab tseem ceeb ntawm txoj kab ncaj nraim welded yeeb nkab. Nyob rau hauv tib lub siab ua hauj lwm, cov phab ntsa thickness ntawm cov kauv welded yeeb nkab ntawm tib txoj kab uas hla yuav txo tau piv nrog cov ncaj seam welded yeeb nkab.
Raws li cov yam ntxwv saum toj no:
A. Thaum cov kauv welded yeeb nkab yog blasted, vim yog qhov me me ib txwm muaj kev ntxhov siab thiab cov kev ntxhov siab sib xyaw ntawm cov vuam, lub qhov blasting feem ntau tsis tuaj ntawm cov kauv welded seam, thiab nws txoj kev nyab xeeb yog siab dua li ntawm qhov ncaj seam welded yeeb nkab. .
B. Thaum muaj qhov tsis xws luag nyob ze ntawm cov kauv vuam, vim tias lub zog ntawm cov kauv vuam yog me me, qhov kev pheej hmoo ntawm nws qhov nthuav dav tsis zoo li qhov ncaj ntawm qhov vuam.
C. Txij li thaum lub radial kev nyuaj siab yog qhov siab tshaj plaws kev ntxhov siab uas muaj nyob rau hauv cov yeeb nkab steel, lub weld bears lub siab tshaj plaws load thaum nws yog nyob rau hauv cov kev taw qhia ntawm ntsug kev nyuaj siab. Ntawd yog, qhov ncaj seam bears qhov loj tshaj plaws load, lub voj voog ncig bears qhov tsawg tshaj plaws load, thiab kauv seam nyob nruab nrab ntawm ob.
