摘要:
Compressed air is blown through a hole formed at one end of a transverse bulkhead into the clearance formed between a longitudinal bulkhead and a transverse bulkhead to test the water tightness of the weld zones formed thereat. Every block which is built as the hull construction based on known block system progresses, is tested and its water tightness confirmed thereby.
摘要:
A movable welding jig for welding upright reinforcing plates to a main plate. The jig has a pair of spaced wheel structures and posts extending upwardly therefrom and carrying an upper supporting structure from which a plurality of holding assemblies depend for holding in upright positions reinforcing plates to be welded to a main plate while being freely movable longitudinally along the reinforcing plates. The upper supporting structure carries a plurality of pressing units for pressing the reinforcing plates downwardly against the main plate. When used in connection with the welding of stringers to a main plate, a guide stringer is first welded, as by tack-welding, to the main plate, and then a movable jig is moved along the guide stringer to be guided thereby while holding additional stringers at predetermined positions with respect to the guide stringer.