| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent zinc from being boiled or vaporized during the welding with a steel tube by forming a circular seat concentric with forward and rear surfaces of a hole in a galvanized steel member to be welded, and continuously providing first and second seats to have the outside diameter of the specified dimensions added to the specified depth and the specified hole diameter on one surface, and the specified dimensions added to the specified depth and hole diameter on the other surface. SOLUTION: A flange 1 having a hole 4 in which a tube is inserted is immersed in a molten zinc to be galvanized. A seat 5 is formed on a forward surface 3, and seats 6, 7 are formed on a rear surface 2, and the seats 5, 6, 7 are cut to remove a zinc film. The depth of the seat 5 is selected from 3-9 mm, and the outside diameter is the one obtd. by adding the length selected from the range of 0.5-3 mm to the inside diameter of the flange. The depth of the seat 7 is selected from the range of 0.5-3 mm and the outside diameter is the one obtd. by adding the length selected from the range of 5-10 mm to the inside diameter of the flange to form a first seat, and similarly, the depth of the seat 6 is selected from the range of 1-5 mm and the outside diameter is the one obtd. by adding the length selected from the range of 0.5-3 mm to the inside diameter of the flange to form a second seat. A surface to be welded is of stock skin, easy to be welded.</p> |
