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首页> 外文期刊>Sodagem & inspecao >Assessment of the Use of Negative Polarity in Double-Wire MIG/MAG-Welding Filling Passes
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Assessment of the Use of Negative Polarity in Double-Wire MIG/MAG-Welding Filling Passes

机译：评估在双线MIG / MAG焊接充填焊道中使用负极性

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The aim of this work was to evaluate the use of negative polarity in the trail wire in double-wire MIG/MAG-welding filling passes. A comparative study of the conventional technique (two wires working with pulsed DCEP) and the proposed combinations of pulsed DCEP in the lead wire with pulsed DCEN in the trail wire and pulsed DCEP in the lead wire with controlled short-circuit CSC(-) in the trail wire was carried out. The mean current in each wire and the ratio of travel speed to wire feed rate (for the same bead volume per unit weld length), as well as wire type and size, shielding gas composition and joint type (a butt joint in a flat position), were kept constant. Bead surface finish and geometry, deposition efficiency and maximum travel speed for each combination were evaluated. In conclusion, the use of negative polarity in the trail wire increased the deposition rate (higher travel speeds for the same bead) compared with the use of pulsed DCEP in both wires but at the cost of reduced operational robustness, as the conventional technique allowed a sound bead to be produced over a wider range of travel speeds. In addition, beads welded using negative polarity had smaller fusion zones and narrower heat-affected zones but higher convexities.
机译：这项工作的目的是评估在双线MIG / MAG焊接填充焊道中在牵引线中使用负极性。比较传统技术（两根使用脉冲DCEP的导线）和建议的引线中的脉冲DCEP与尾线中的脉冲DCEN和引线中的脉冲DCEP（控制短路CSC（-））的组合拖线已完成。每根焊丝的平均电流和行进速度与焊丝进给速度的比值（对于每单位焊接长度相同的焊缝体积），以及焊丝的类型和尺寸，保护气体成分和接头类型（对接接头处于平坦位置），保持不变。评估了每种组合的珠子表面光洁度和几何形状，沉积效率和最大移动速度。总之，与在两根导线中使用脉冲DCEP相比，在尾线中使用负极性可增加沉积速率（同一珠粒的行进速度更高），但以降低操作鲁棒性为代价，因为传统技术允许声珠可在更宽的行进速度范围内产生。另外，用负极焊接的焊珠具有较小的熔合区和较窄的热影响区，但凸度较高。

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