| 摘要 |
PROBLEM TO BE SOLVED: To reduce a welding cost by using a backing having common usabiliy and weld reliability even though the R shape of a web and flange crossing part due to the kind of the wide flange shape steel is different in the case of welding and joining the wide flange shape steel with a non-scallop engineering method. SOLUTION: The backing 21 is provided with a notch part 23, having an inclined surface 23a along a groove surface 5 fitted into the crossing part of the web 2 and flange 3 of the wide flange shape steel 1 cut into a designed groove shape, and an arm member 24 positioning the backing 21 based on the thickness surface of the web 2 as a reference. When the backing 21 is fitted into the crossing part of the web 2 and flange 3 of the shape steel 1, the inclined surface 23a in the notch part is abutted and installed along the groove angleθof the web 2, a weld zone without missing any molten bead is formed. Also, at this time, the width of the notch part 23 is wider than the width W of the curved surface in the R part of the flange 3 and web 2, and further the end of the arm member 24 is positioned based on the thickness surface of the web 2 as the reference regardless of the R part. Therefore, the backing metal is used in common regardless of the kind of the shape steel.
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