| 摘要 |
A boss 10 is welded onto a thin casing 12. The casing 12 is held in a fixture (not shown) with a backing plate 20 adjacent surface 18. The backing plate 20 is located on the opposite side from the surface 14 onto which the boss 10 is to be welded. By using a backing plate 20 the depth of the weld zone, h, can exceed the casing thickness, t. The backing plate 20 is sacrificial and is released by removing the central part of the boss 10 where it has been bonded to the plate 20. Provided that the diameter D 1 of the central part of the boss 10 exceeds the diameter of the bonded region D 2 the plate 20 is released from the casing 12. |
