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为探究奥氏体不锈钢药芯焊丝弧焊中保护气成分对其接头力学性能的影响机理,通过硬度测量、冲击试验和弯曲试验,研究氩气(Ar)、二氧化碳(CO2)和氧气(O2)不同比例混合保护气对奥氏体不锈钢药芯焊丝弧焊接头力学性能的影响,并结合金相组织观察、光谱成分分析和断口扫描分析等方法对其影响机理进行分析和研究。结果表明,随着保护气体中CO2成分的增加,接头焊缝区域硬度降低、冲击韧性下降,但对接头弯曲性能影响不大,这主要与焊缝组织中铁素体所占比例降低以及氧化物夹杂增多有关。同时发现,保护气中加入一定量的O2具有抑制CO2的分解、减缓接头硬度和冲击韧性下降的作用。
In order to investigate the influence mechanism of protective gas composition on mechanical properties of austenitic stainless steel flux cored arc welding, the effects of argon (Ar), carbon dioxide (CO2) and oxygen (O2) were studied by means of hardness measurement, impact test and bending test. The influence of mixed gas with different proportions on the mechanical properties of austenitic stainless steel flux-cored arc welding joints was analyzed and studied based on the microstructure observation, spectral composition analysis and fracture-scanning analysis. The results show that with the increase of CO2 content in the protective gas, the hardness of the joint weld decreases and the impact toughness decreases, but it has little effect on the bending performance of the joint, which is mainly attributed to the decrease of the proportion of ferrite in the weld and the inclusion of oxide Increased related. At the same time, it is found that adding a certain amount of O2 in the protective gas can inhibit the decomposition of CO2 and slow down the decrease of joint hardness and impact toughness.