水闪蒸罐筒体焊缝的裂纹成因分析

Genetic Analysis of a Crack Formed in a Welded Joint of the Water Flashing Vessel

本文分析了水闪蒸罐筒体焊缝中冷裂纹的成因，认为是马氏体组织、焊接残余应力和氢等因素综合作用的结果。并阐述了为防止焊接冷裂纹的产生，应保持焊接坡口清洁、烘干焊条、进行焊前预热和焊后热处理等。

Abstract Chemical constitution and metallic phase near the longitudinal welded seam crack of the water flashing vessel are analysed.At the same time from the macrograph of the crack and the microgafrph of the crack fracture,we conclude that it is a cooling crack.The main genesis of the cooling crack is martensitic structure、welding residual stress and hydrogenium near the crack.At last,the measures to prevent the cooling crack are advanced.