裂解炉炉管吊耳弯头焊接裂纹产生原因分析

由于在更换文丘里管的施工中,吊耳弯头两端焊缝及母材不断产生裂纹,导致施工无法进行。通过研究吊耳弯头材质化学成分及焊缝的金相组织,找出产生焊接裂纹的原因。利用金相检验、化学成分分析、渗透检验等方法分别对母材及焊缝的开裂原因进行分析。结果表明：母材与焊缝附近开裂本质一致,都是源于热应力,在焊接状态下由于母材中碳和铜含量超标,造成母材脆性开裂。该批次吊耳弯头为不合格品,不能使用。

Analysis Causes of Welding Cracks in the Pipe Lifting Lug Elbow of Cracking Furnace

In the processing of replacing the Venturi throat,there were cracks continually occuring in the welded seams as well as the base materials of the both ends of the lifting lug elbows,which caused it impossible to have the project continuing.In order to find out the causes that led to the welding cracks,researching was made,which was mainly for analysing the chemical constitution of the lifting lug elbow's materials and the metallurgical structure of the welding beams.For the cracking causes of the base mater...