Abstract: A new type of welded slag pot was innovatively developed and applied through the research of finite-element simulations，material performance evaluation，welding technology and manufacturing processes，because the traditional cast slag pot was liable to crack，hard to be welded and repaired，and short service life. Temperature field，distribution for stress and distortion of welded slag pot in different conditions were calculated by finite-element simulations and the results were basically in line with the field data，providing reliable guidance to structure design，improvement and application of welded metallurgical slag pot. Eight-years application of welding metallurgy slag pot demonstrated extensive application prospects for its better weld ability，great remediation potential，longer service life which was 2—3 times of the traditional cast slag pot，lower producing price which was 60%~65% percent of the traditional cast slag pot and green manufacturing concept.

Key words: welded slag pot, finite-element simulations, scene tracking tests, application effect