理化检验-物理分册2025，Vol.61Issue(5)：53-56,4.DOI:10.11973/lhjy-wl240276
换热器筒体法兰焊缝开裂原因
Cracking reason of flange weld of heat exchanger cylinder
韩大明 1安洪亮 1孙洪伟 1胡希海 2王博 1胡庆睿3
作者信息
- 1. 中国机械总院集团哈尔滨焊接研究所有限公司,哈尔滨 150028
- 2. 抚顺机械设备制造有限公司,抚顺 113121
- 3. 抚顺市特种设备监督检验所,抚顺 113006
- 折叠
摘要
Abstract
Cracking occurred in the welded joint of heat exchanger cylinder and flange in a equipment manufacturer.The crack and fracture of the weld cracking area were analyzed by means of chemical composition analysis,hardness test,metallographic examination and scanning electron microscope analysis.The results show that the chemical composition of the cylinder and flange met the standard requirements,and the selection of welding materials was reasonable.The weld formed a hardened structure,and the overheated zone of the joint was a high hardness zone with a maximum hardness of 436 HV1.Under the action of circumferential tensile stress,an intergranular crack extending from the inner surface to the outer surface was generated in the welded joint.The crack ended at 70 mm from the surface of the backing weld,and the cracking property was hydrogen-induced delayed cracking.The high strength of the heat exchanger cylinder and the large hardening tendency were the root causes of hydrogen embrittlement cracking in the weld.关键词
12Cr2Mo1V钢/换热器/焊缝/延迟裂纹/氢脆Key words
12Cr2Mo1V steel/heat exchanger/welding seam/delayed crack/hydrogen embrittlement分类
矿业与冶金引用本文复制引用
韩大明,安洪亮,孙洪伟,胡希海,王博,胡庆睿..换热器筒体法兰焊缝开裂原因[J].理化检验-物理分册,2025,61(5):53-56,4.
