抄録
In this report the authors have investigated how to apply the flame-straightening to superstructure of the welded ship construction.
It has been discovered that the flame-straightening is effective in the case of ship steel plate and its application needs the following conditions;
(1) The effective heating time are 15, 20 and 30 sconds respectively in each 6, 8 and 10 mm thickness using No. 750 tip.
(2) The pitches between adjacent heating points are 75 mm in straight lines and 50 mm in staggered spots.
(3) Both cases of straight lines and staggered spots have equal effectiveness, but the former is rather more effective than the later.
(4) Straightening is to be started from periphery to the centre of the deflected panel.
(5) Using strongback it could be straightened more effectively.
(6) It is recommended to use fresh water instead of sea water to cool the plate after heatiug on the dockyard.
