ABSTRACT The effect of welding condition on solidification cracking behaviour was investigated during the U-type hot cracking test. In order to investigate the behaviour of solidification cracking, a high-temperature ductility curve and a thermal strain curve were calculated. The high-temperature ductility curve was obtained based on a combination of the solidification initiation and completion temperatures, in addition to the critical strain, while the thermal strain curve was calculated using a finite-element model (FEM). The solidification brittleness temperature ranges (BTR) were almost constant. However, increasing the heat input suppressed cracking by reducing the slope of thermal strain due to yield strength reduction in heat-affected zone resulting in relieving a stress on weld bead, and eventually, solidification cracking was suppressed.

中文翻译：

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焊接条件对奥氏体不锈钢凝固裂纹行为的影响

摘要 在 U 型热裂纹试验中研究了焊接条件对凝固裂纹行为的影响。为了研究凝固开裂的行为，计算了高温延展性曲线和热应变曲线。高温延展性曲线是基于凝固起始温度和完成温度以及临界应变的组合获得的，而热应变曲线是使用有限元模型 (FEM) 计算的。凝固脆性温度范围 (BTR) 几乎是恒定的。然而，增加热输入通过降低热影响区屈服强度降低导致的热应变斜率来抑制裂纹，从而释放焊道上的应力，最终抑制凝固裂纹。