The effect of various process parameters like welding current, torch height, welding speed and plasma gas flow rate on front melting width, back melting width and weld reinforcement of plasma arc welding on aluminum a...The effect of various process parameters like welding current, torch height, welding speed and plasma gas flow rate on front melting width, back melting width and weld reinforcement of plasma arc welding on aluminum alloy is investigated by using factorial design approach. Variable polarity plasma arc welding is used for welding aluminum alloy. Trail experiments are conducted and the limits of the input process parameters are decided. Two levels and four input process parameters are chosen and experiments are conducted as per typical design matrix considering full factorial design. Total sixteen experiments are conducted and output responses are measured. The coefficients are calculated by using regression analysis and the mathematical models are constructed. By using the mathematical models the main and interaction effect of various process parameters on weld quality is studied.展开更多
为探究焊枪倾角对缆式焊丝熔化极气体保护焊(gas metal arc welding, GMAW)焊接过程和焊缝成形的影响,通过对比研究分析了不同焊枪倾角下焊接电弧形态、熔滴过渡特征和焊缝形貌特点及影响机理,研究结果表明:在相同焊接条件下,电弧宽度...为探究焊枪倾角对缆式焊丝熔化极气体保护焊(gas metal arc welding, GMAW)焊接过程和焊缝成形的影响,通过对比研究分析了不同焊枪倾角下焊接电弧形态、熔滴过渡特征和焊缝形貌特点及影响机理,研究结果表明:在相同焊接条件下,电弧宽度随着焊枪倾角的增加减小,前倾相对后倾电弧具有更好的稳定性;相同焊枪倾角下,前倾电弧宽度相对后倾宽度减小11%.熔滴过渡频率随焊枪倾角的增加而增加,并随着角度增加逐渐呈现沿轴线过渡;前倾时飞溅小于后倾状态,熔滴过渡频率相对后倾增加32%.不同焊枪倾角下,前倾焊缝成形优于后倾状态;后倾时随角度减小焊缝成形逐渐变差,且产生咬边和大颗粒飞溅等缺陷.焊枪倾角为60°和75°时,焊枪前倾比后倾熔宽平均增加约43%,熔深平均减小约18%,余高相近.展开更多
为实现焊接机器人焊枪定位与焊缝走向识别,提高焊缝跟踪精度,提出了一种交叉式双条纹激光传感方式,建立了该传感方式下双条纹激光间距与焊枪高度关系的理论模型.按图像行上灰度值和的一阶导数提取感兴趣区域(region of interest,ROI)、...为实现焊接机器人焊枪定位与焊缝走向识别,提高焊缝跟踪精度,提出了一种交叉式双条纹激光传感方式,建立了该传感方式下双条纹激光间距与焊枪高度关系的理论模型.按图像行上灰度值和的一阶导数提取感兴趣区域(region of interest,ROI)、最大类间方差阈值分割及Canny边界提取等处理后,获得了上下激光条纹中心间距离及坡口中心值,由理论模型计算得焊枪高度,上下坡口中心值获得焊缝精确偏差与焊缝轨迹走向.结果表明,建立的理论模型正确,该方法可快速实现焊枪准确定位,识别焊缝轨迹走向,减小导前误差,提高偏差识别精度和焊接机器人智能化程度.展开更多
文摘The effect of various process parameters like welding current, torch height, welding speed and plasma gas flow rate on front melting width, back melting width and weld reinforcement of plasma arc welding on aluminum alloy is investigated by using factorial design approach. Variable polarity plasma arc welding is used for welding aluminum alloy. Trail experiments are conducted and the limits of the input process parameters are decided. Two levels and four input process parameters are chosen and experiments are conducted as per typical design matrix considering full factorial design. Total sixteen experiments are conducted and output responses are measured. The coefficients are calculated by using regression analysis and the mathematical models are constructed. By using the mathematical models the main and interaction effect of various process parameters on weld quality is studied.
文摘为探究焊枪倾角对缆式焊丝熔化极气体保护焊(gas metal arc welding, GMAW)焊接过程和焊缝成形的影响,通过对比研究分析了不同焊枪倾角下焊接电弧形态、熔滴过渡特征和焊缝形貌特点及影响机理,研究结果表明:在相同焊接条件下,电弧宽度随着焊枪倾角的增加减小,前倾相对后倾电弧具有更好的稳定性;相同焊枪倾角下,前倾电弧宽度相对后倾宽度减小11%.熔滴过渡频率随焊枪倾角的增加而增加,并随着角度增加逐渐呈现沿轴线过渡;前倾时飞溅小于后倾状态,熔滴过渡频率相对后倾增加32%.不同焊枪倾角下,前倾焊缝成形优于后倾状态;后倾时随角度减小焊缝成形逐渐变差,且产生咬边和大颗粒飞溅等缺陷.焊枪倾角为60°和75°时,焊枪前倾比后倾熔宽平均增加约43%,熔深平均减小约18%,余高相近.
文摘为实现焊接机器人焊枪定位与焊缝走向识别,提高焊缝跟踪精度,提出了一种交叉式双条纹激光传感方式,建立了该传感方式下双条纹激光间距与焊枪高度关系的理论模型.按图像行上灰度值和的一阶导数提取感兴趣区域(region of interest,ROI)、最大类间方差阈值分割及Canny边界提取等处理后,获得了上下激光条纹中心间距离及坡口中心值,由理论模型计算得焊枪高度,上下坡口中心值获得焊缝精确偏差与焊缝轨迹走向.结果表明,建立的理论模型正确,该方法可快速实现焊枪准确定位,识别焊缝轨迹走向,减小导前误差,提高偏差识别精度和焊接机器人智能化程度.
