In many cases, flame straightening is unavoidable after welding for the reduction of deformation. Due to the not very concentrated heat source, the process can cause significant changes in the microstructure, especially in high strength and wear-resistant steels. Due to their different physical properties, the effects vary depending on the flammable gases (acetylene, propane). The situation is complicated by the fact that the manual technology carries a risk of overheating, which can have detrimental effects on the mechanical properties. During our experiments, three steels are investigated (S355J2 + N, XAR400, S960QL). The thermal cycles for the physical simulations were determined by thermocouple measurement during real experimental conditions. Three peak temperatures (1000 °C, 800 °C and 675 °C) and two types of industrial cooling conditions (air and water cooling) were studied. The samples were examined by optical microscopy tests, hardness testing and Charpy V-notch impact tests. During straightening the XAR400 showed high sensitivity to softening even in the lower temperature range, while hardening occurred in the S960QL steel at a higher peak temperature values during water cooling. The inter- and supercritical temperature should be avoided in all steels; however, the subcritical temperature can be beneficial to the toughness properties of the S960QL and XAR400.

在许多情况下，为减少变形，在焊接后不可避免地要进行火焰矫正。由于热源不是很集中，该过程可能会导致组织发生重大变化，尤其是在高强度和耐磨钢中。由于其不同的物理特性，其效果根据可燃气体（乙炔，丙烷）的不同而不同。手动技术存在过热的风险，使情况变得复杂，这会对机械性能产生不利影响。在我们的实验过程中，研究了三种钢（S355J2 + N，XAR400，S960QL）。物理模拟的热循环是通过在实际实验条件下进行热电偶测量来确定的。三个峰值温度（1000°C，研究了800°C和675°C）以及两种类型的工业冷却条件（空冷和水冷）。通过光学显微镜测试，硬度测试和夏比V型缺口冲击测试对样品进行检查。在矫直过程中，XAR400甚至在较低温度范围内也显示出对软化的高敏感性，而S960QL钢在水冷过程中在较高的峰值温度下发生硬化。所有钢都应避免中间和超临界温度。但是，亚临界温度可能有利于S960QL和XAR400的韧性。S960QL钢在水冷过程中在较高的峰值温度下发生硬化。所有钢都应避免中间和超临界温度。但是，亚临界温度可能有利于S960QL和XAR400的韧性。S960QL钢在水冷过程中在较高的峰值温度下发生硬化。所有钢都应避免中间和超临界温度。但是，亚临界温度可能有利于S960QL和XAR400的韧性。