| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for deciding the weldability of a tinned steel sheet for a welded can at high precision. SOLUTION: At the measuring positions of three or more parts in the sheet width direction at the inside region other than the wide part of 1 mm on both the side edge parts in a tinned steel sheet 1 for a welded can, the coating weights 3 of metal tin stuck to the front and rear both sides 2a, 2b of a steel sheet stock 2 are respectively measured. The measured values on front and rear both sides to form a pair are respectively added together to calculate the coating weights of both the sides in each measuring position, when both sides coating weights at each measuring position satisfy the range of 1.0 to 2.0 g per m<SP>2</SP>of the steel sheet stock, it is determined that satisfactory weldability can be secured, and when both sides coating weights in each measuring position is off the inside of the range of 1.0 to 2.0 g per m<SP>2</SP>of the steel sheet stock, it is decided that the risk of generating the defect of welding is high. COPYRIGHT: (C)2011,JPO&INPIT
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