| 摘要 |
PURPOSE:To make the grinding work efficient simply and quickly by reducing the grinding margin compared to the grinding of the conventional overlapped welding part, by welding in a butt state the sectional face of the bend part which is respectively provided on the window hole port edge of a top plate and the upper edge of a water tank. CONSTITUTION:A bend part is respectively provided on the top plate 2 and water tank 3 which are individually press-formed without overlapping the window hole port edge of the top plate and the upper edge of the water tank as in the past. Namely the bend parts 2a and 3a which are cut so that the above of the respective face becomes the same locus are provided in advance on the window hole port edge 7 in the top plate 2 and on the upper edge in the water tank 3. The sectional parts of the bend parts 2a and 3a are then welded in butt state. The junction part 8 of the top late 2 and water tank 3 is integrally finished in a smooth line by grinding both sides of the junction part 8 upto the pit face of the junction part 8 after said welding.
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