宽厚板精轧机特大型铸钢牌坊在线焊接修复

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Abstract：Caststeelarchwayisthe keycomponentof wide and heavy plate finishing mill，which has large weight， large volume，large cross-sectional area and large rigidityandthecrack iseasy to expand aftercrack.at present， the cracks are basically repaired by miling and removing cracks.this way will lead to thereduction of the crosssectional area of the archwayand the roling force，which can not meet the requirements of normal use and affect production. According to the material and crack characteristics of the archway，combined with the bearing capacity ofthe production site，this paper analyzes thecauses ofthecracking of the archwayandthe weldabilityof the cast steel archway，formulates theon-linerepair process，andcarriesonthe on-line weldingrepair tothearchway of the finishing mill.te repaired archway meets the normal use requirements，ensures the rollingqualityof the wide and heavy plate finishing mill prolongs the service life of the equipment，and saves a lot of money and time.

Keywords：archway;crack;alternating load;heat treatment;on-line repair

1序言

精轧机是宽厚板生产线的重要设备，铸钢牌坊是精轧机的关键部件，精轧机由4根分体式牌坊组成轧机设备承载负荷体系。（剩余5201字）