Research on Quenching to prevent Steel Plate Deformation caused by Oxygen Cutting

Abstract

When cutting the mild steel plate by oxygen, some deformation remains frequently due to the effect of local heating and cooling. The influence of this deformation makes the further works difficult.Several methods to prevent this kind of deformation have been reported recently, but it seems to us that these methods do not always meet our satisfaction.For this purpose, we have discovered a new and quite interesting method, applying water quenching right after oxygen cutting, which enables us to reduce the amount of deformation almost to zero without giving any harm to the material.In this research, we found out the suitable quenching condition and investigated the influence of this process to the material.The following results are summarized from the experiment.1. According to the quenching condition, shown in TABLE 10, we could reduce the amount of deformation more than 1/10 of the one caused by ordinary oxygen cutting.2. The change in material characteristics throughout this process is out of question, namely, after electric arc welding no difference is found in material characteristics comparing with the ordinary process. On the contrary, the free edge as cut, not intended for electric arc welding, is inferior for cold bending and brittle fracture. But we can eliminate this inferiority by applying a simple additional treatment.3. To apply this process, it is not necessary to arrange any special apparatus but only a simple water nozzle with its holder, rubber water tube and some water.Therefore, this process is easy to manage and is very much economical, as for, we are possible to carry on the further works without any fairing.