[1]闫侯霞.12Cr1MoVG集箱三通焊缝横向开裂原因分析及预防措施[J].焊管,2022,45(8):40-43,48.[doi:10.19291/j.cnki.1001-3938.2022.08.007]
 YAN Houxia.Cause Analysis and Preventive Measures for Tee Weld Horizontal Cracking of 12Cr1MoVG Header[J].,2022,45(8):40-43,48.[doi:10.19291/j.cnki.1001-3938.2022.08.007]
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12Cr1MoVG集箱三通焊缝横向开裂原因分析及预防措施()
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
45
期数:
2022年第8期
页码:
40-43,48
栏目:
失效分析
出版日期:
2022-08-28

文章信息/Info

Title:
Cause Analysis and Preventive Measures for Tee Weld Horizontal Cracking of 12Cr1MoVG Header
文章编号:
10.19291/j.cnki.1001-3938.2022.08.007
作者:
闫侯霞
内蒙古能源发电金山热电有限公司,呼和浩特 010106
Author(s):
YAN Houxia
Inner Mongolia Energy Porver Jinshan Thermalelectric Co,Ltd,Hohhot 010106,China
关键词:
12Cr1MoVG 钢焊缝开裂显微组织断口形貌
Keywords:
12Crl MoVG steelweldcrackmicrostructurefracture morphology
分类号:
TG441
DOI:
10.19291/j.cnki.1001-3938.2022.08.007
文献标志码:
B
摘要:
为了解决某锅炉12Cr1MoVG集箱厚壁三通焊缝频繁出现横向开裂的问题,通过对开裂焊缝母材壁厚范围和部件结构特点进行分析,并采用宏观检验、化学成分分析、金相组织及断口微观分析等方法,对开裂原因进行了分析,并提出了开裂预防措施。结果表明,三通焊缝开裂主要原因是焊接过程中焊接工艺执行不当,焊缝中形成晶粒粗大区域并形成热裂纹,运行中在循环应力作用下不断扩展并最终导致开裂。建议在机组施工中采取调整三通结构、严格执行焊接工艺及热处理工艺等措施预防焊缝开裂。
Abstract:
In order to solve the problem of frequent horizontal cracking in the thick wall tee weld of 1 2Cr1MoVG header,the causes of cracking are explored by analyzing the wall thickness range of the cracked weld base metal and the structural characteristics of the components,and by means of macro inspection,chemical composition analysis,metallographic structure and fracture microanalysis,and the preventive measures for cracking are put forward. The results show that the main cause of tee weld cracking is the improper execution of welding process,the formation of coarse grain areas and thermal cracks in the weld,and the continuous expansion of the thermal cracks under the action of cyclic stress during operation,which eventually leads to cracking. It is suggested to take measures such as adjusting the tee structure,strictly executing the welding process and heat treatment process in the unit construction to prevent weld cracking.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2022-02-23作者简介:闫侯霞(1981—),女,汉族,内蒙古鄂尔多斯人,硕士,高级工程师,主要从事火电站金属技术监督工作。
更新日期/Last Update: 2022-08-26