灰口铸铁焊接区氢的微观分布及逸出特点

Microscopic Redistribution Behaviours and Bubbling-up Characteristic of Residual Diffusible Hydrogen in the Grey Iron Weldment

关键词:  灰口铸铁  扩散氢  冷裂纹

Key words:  grey iron  residual diffusible hydrogen  cold cracking

摘要:

采用显微镜下摄影测氢法,从微观上研究了灰口铸铁母材同质焊缝及异质焊缝焊接区扩散氢的分布及其逸出动态过程,说明了由于石墨的储氢及阻碍氢向前扩散的作用,使进入灰口铸铁焊接接头热影响区的扩散氢很少,因此,氢对灰口铸铁热影响区的冷裂纹倾向影响也小。

Abstract:

A measuring method taking views of hydrogen behaviours under microscope is applied to study the redistributive and bubbling-up course of the residual diffusible hydrogen in the grey iron weldments welded with both the homogenous and the heterogenous electrodes. Because the flaky graphite can not only store the hydrogen but also block the hydrogen to diffuse forward, the amounts of the residual diffusible hydrogen which can come into the HAZ of the grey iron joint is very small, and so the influence of the hydrogen on the cold cracking tendency of the HAZ of grey iron joint is little too.