39. Vim li cas qhov sib txawv ntawm cov pits corrosion tshwm nyob rau saum npoo ntawm welded steel kav tom qab acid pickling?

Welded steel kav yog yooj yim rau kev txhim kho corrosion pits raws longitudinal weld seams tom qab acid pickling, tshwj xeeb tshaj yog nyob rau hauv gas-welded thiab furnace-welded kav. Qhov tshwm sim no feem ntau tshwm sim vim qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm cov vuam seam thiab lub hauv paus hlau thaum vuam, uas ua rau muaj kev ntxhov siab sab hauv. Cov kev ntxhov siab no-cov cheeb tsam uas raug tsim los ua rau muaj kev cuam tshuam rau qhov sib txawv ntawm kev xeb los ntawm cov kev daws teeb meem. Tsis tas li ntawd, oxides thiab impurities embedded nyob rau hauv weld seam thaum lub sij hawm welding muaj qhov sib txawv corrosion tus nqi nyob rau hauv pickling kev daws teeb meem vim hais tias lawv muaj peev xwm sib txawv, uas ua rau ib tug tsis sib luag ntawm corrosion pits.