CAJ | 학술논문

通过对铝合金3003变极性等离子弧穿孔立焊熔池振荡行为的研究，发现熔池振荡频率与焊接熔透之间的内在规律。在变极性电流的作用下，焊接熔池产生振荡，可以通过对电弧电压频谱分析获得熔池固有振荡频率。分别建立变极性等离子弧穿孔立焊未熔透及完全熔透熔池模型，并分析焊接电流的变化对熔池固有振荡频率的影响，发现焊接电流大小对其影响很小，可以忽略。为了验证该模型的准确性，进行理论与实测分析，结果表明，理论值与实测值相吻合。熔池固有振荡频率主要取决于熔池宽度、深度及材料密度等参数，而其他焊接参数对其没有直接影响。因此，熔池振荡频率可间接反映焊接熔透信息，为焊接质量自动控制提供了理论支持。
통과대려합금3003변겁성등리자호천공립한용지진탕행위적연구，발현용지진탕빈솔여한접용투지간적내재규률。재변겁성전류적작용하，한접용지산생진탕，가이통과대전호전압빈보분석획득용지고유진탕빈솔。분별건립변겁성등리자호천공립한미용투급완전용투용지모형，병분석한접전류적변화대용지고유진탕빈솔적영향，발현한접전류대소대기영향흔소，가이홀략。위료험증해모형적준학성，진행이론여실측분석，결과표명，이론치여실측치상문합。용지고유진탕빈솔주요취결우용지관도、심도급재료밀도등삼수，이기타한접삼수대기몰유직접영향。인차，용지진탕빈솔가간접반영한접용투신식，위한접질량자동공제제공료이론지지。
It is discovered the inherent rules between weld pool oscillation frequency and weld penetration though study of weld pool oscillation behavior in the case of variable polarity plasma arc perforated vertical welding of aluminum alloy 3003. During welding, the weld pool is brought into oscillation by variable polarity current, and the oscillation frequency is measured by spectral analysis of arc voltage. The weld pool models of partial penetration and full penetration are established. It is found that variation of welding current has only a small effect on the weld pool oscillation frequency, so its impact can be neglected. In order to test accuracy of the models, it is performed the analysis of theory and measurement, and the results show that two values coincide. The weld pool natural oscillation frequency is dominated by weld pool depth, width and material density and not associated with welding parameters directly. Thus, weld pool oscillation frequency indirectly reflects weld pool penetration, which provides a theoretical support for automatic control of welding quality.