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CN100493825C - Method for hot working and welding heavy

A heating and welding technology for the thick steel plate (80-165 mm in thickness) includes such steps as pre-heating the position to be welded to more than 150 deg.C by heating plates, cutting to form the groove as weld seam, thermal correcting at 640 deg.C for 20 min, cooling in air, removing the quenched layer from said groove, pre-heating to more than 150 deg.C by heating plates, welding