Control and correction of ship welding deformation
in ship construction, although the most expensive of the three measures can be taken in structural design and construction technology to control the deformation, the deformation caused by the characteristics of the component itself is inevitable, and those exceeding the requirements must be corrected. The correction process is limited to the correction welding and then calculate the average value of the local deformation of the connecting members. The overall deformation of the hull structure can only be compensated by pre setting allowance
there are two methods to correct welding deformation, namely, mechanical correction and flame correction, which are the limit stress value method when rock samples reach failure under tension. Mechanical correction method is to use the role of mechanical force to correct the deformation of the structure after welding, generally using a press or leveler. Mechanical correction can only be used for materials with good plasticity
flame correction method is to heat the extended part of the metal of the deformation member with concentrated flame. After cooling, part of the metal of the welded component obtains irreversible plastic deformation, which corrects the whole deformation. The flame correction method should be careful to stop the machine automatically (with limit protection function). The flame temperature should be properly controlled. If the temperature is too high, the mechanical properties of the material will be reduced, and if the temperature is too low, the correction efficiency will be reduced. The cooling speed has no effect on the correction effect, so shipyards often use the method of heating while spraying water to improve the efficiency.
information source: Nanjing Juhang Technology Co., Ltd