CERAMIC BACKING MATERIAL FOR ELECTROGAS WELDING AND CERAMIC WELDING SUPPORT ELEMENT

摘要

The present invention relates to a ceramic backing material for electrogas welding comprising: SiO_2; Al_2O_3; MgO; an alkali oxide; and an alkaline earth oxide. The SiO_2 is 24-38 wt%, the Al_2O_3 is 58-76 wt%, the MgO is 3-8 wt%, and the alkali oxide and alkali earth oxide are 2.5-5.0 wt%. When high heat input electrogas welding is performed, welding workability and welding progression are improved; a low backside bead is generated; and is possible to obtain excellent impact toughness equal to or greater than the welding specifications.;COPYRIGHT KIPO 2017