装甲钢CO2气体保护焊焊接接头组织和抗裂性分析
Microstructures and crack resistance of armoured steel weldment by CO2 shielded arc welding
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摘要: 采用自制H10MnSi和H08Mn2Si焊丝分别制备装甲钢CO2气体保护焊焊接接头,通过金相显微镜、扫描电子显微镜和显微硬度计对装甲钢焊接接头组织及其硬度分布进行对比研究;通过斜Y形坡口焊接裂纹试验评定了自制H10MnSi焊丝和H08Mn2Si焊丝的抗裂性倾向。结果表明,在H08Mn2Si焊丝基础上改进的自制H10MnSi焊丝应用于装甲钢CO2气体保护焊时,其焊缝组织细化,针状铁素体比例明显高于H08Mn2Si焊丝,这使得H10MnSi焊丝的抗裂性优于H08Mn2Si焊丝。Abstract: The armoured steel welded joints were prepared by CO2 shielded arc welding with modified H10MnSi wire and H08Mn2Si wire respectively. The microstructures of the welded joints were examined by means of Olympus optical microscope and scanning electron microscope. And the Vickers microhardness profiles were measured by Vickers microhardness tester. The crack resistance in Y-groove welded joints was also compared. The experiment results showed that the crack resistance of the welded joint using H10MnSi wire was better than that of the weldment using H08Mn2Si wire, which is mainly due to the fine crystal grain in the weld metal and the more content of acicular ferrite.
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