So the crack is reheat crack,it can be .
通过扫描电镜、能谱仪及光学显微镜对裂纹产生原因进行了深入分析,认为该裂纹属高温形成的再热裂纹,可以通过改变预热、后热温度,提高焊接质量以降低应力集中等方法来防治。
The base metal 15CrMoG component and weldability,welding method,welding material,welding structure,technics parameter,welding process and heat treatment were analyzed,the improving welding measure was put forward,which effectively avoided reheat crack and the other welding defects of certain ship boiler pipe.
通过对15CrMoG钢母材成分及焊接性能、焊接方法、焊接材料、焊接结构、工艺参数、焊接操作和热处理的分析,提出了改进的焊接措施,有效地防止了某船锅炉管再热裂纹和其它焊接缺陷的产生。
After analyzing,the source of the welded joint fracture on the sealing structure of the reheater through the penthouse superheater in a 1025t/h boiler is reheat crack which is caused by high rigidity and high stress concentration of the welding joint,excessive welding energy input and heat stress existing in the joint when operating.
分析某发电厂1025 t/h锅炉再热器穿顶密封结构焊接接头的开裂源于再热裂纹,裂纹的产生原因在于:焊接接头高刚度、高应力集中,过大焊接线能量及接头在运行中存在热应力。
The susceptibility of HCM2S steel to reheat cracking has been studied by y-groove restraint weld cracking tests,which confirm the steel's susceptibility in the temperature range between 690(°C)～760(°C).
通过斜y型拘束焊接试验方法对HCM2S钢的再热裂纹敏感性进行了试验研究。
On the basis of the principles and structures of the cold cracking implant testing machine,the study on the implant equipment of reheat cracking test is reviewed in this paper.
在深入分析冷裂纹插销试验机的原理和结构的基础上,本文进行了插销式再热裂纹试验装置的研究工作。
After cracking of No 16 high pressure turbine's governor valve base have happened in Shanghai Chongming Power Plant, through the theoretical analysis to the weldability of this governor valve base's pearlitic heat-resisting cast steel and sensitivity of the reheat cracks, we provided, the basis for the preheat temperature and postweld heat treatment procedure of site repair welding.
崇明电力公司 16号汽轮机调门座发生裂纹后 ,通过对该调门座合金钢材料焊接性、再热裂纹敏感性的理论分析 ,为现场焊补工艺提供了预热温度和焊后热处理的工艺依据。
The results indicate that the crack of boiler reheater connecting tube joint is the reheating crack and the primary season in which the cracks occur is excessive stress.
采用宏观分析、力学分析、化学分析、金相检验、扫描电镜等方法对多次出现裂纹的再热器出口联箱管接头(材质为12Cr1MoV)进行失效分析,结果表明,再热器联箱管接头裂纹属于再热裂纹,应力过大是造成泄漏的主要诱因。