分析了滚筒在筒皮和轮毂焊缝处断裂的原因，通过化学成分分析、硬度测试、显微组织观察、断口宏观观察和扫描电镜分析研究了断裂原因。结果表明：轮毂的化学成分符合国家标准，基体组织正常；筒皮中磷成分超过国家标准，基体的带状组织严重，达到了3级，在焊接热影响区形成魏氏组织，使焊缝的韧性急剧下降，焊接接头变脆，导致滚筒在焊缝处开裂。
The weld fracture of drum was analyzed by means of chemical composition analysis, hardness testing, observation of microstructure and fracture and scanning electron microscope analysis. The result showed that the chemical composition of the hub was in line with national standards and its microstructure was normal. The phosphorus content of drum skin was higher than the national standard and its banded structure reaches as high as level 3, forming widmanstatten structure in welding heat affected zone, so that the weld metal toughness decreased dramatically and welding joint is brittle, leading to weld cracking.
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