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对１４ＭｎＮｂｑ钢埋弧焊对接接头焊缝金属中含有裂纹的实物进了金相、扫描电镜及断口微区能谱分析，并采用可调拘束热裂纹敏感性试验方法对１４ＭｎＮｂｑ及１６Ｍｎｑ两种钢材进行了对比，分析了产生热裂纹的原因及其影响因素，提出了防止１４ＭｎＮｂｑ钢埋弧焊焊缝金属热裂纹的措施。
14MnNbq steel submerged arc welding butt weld metal in the weld with the physical into the metallographic, scanning electron microscopy and fracture surface micro-spectrum analysis, and the use of adjustable restraint hot crack sensitivity test method 14MnNbq and 16Mnq two steel In contrast, the causes of the hot cracks and their influencing factors were analyzed. The measures to prevent hot cracks in the 14MnNbq steel were proposed.