环保焊枪吸烟对小电流CO2气体保护电弧焊的影响

Influence of extraction fume by environmental welding torch on low current CO2 gas shielded arc welding

关键词:  环保焊枪  二氧化碳气体保护电弧焊  短路过渡  焊接过程  焊接品质

Key words:  environmental welding torch  carbon dioxide gas shielded welding  short circuit transition  welding process  weld quality

摘要:

采用环保焊枪进行了小电流二氧化碳气体保护电弧焊平焊位置焊接，通过分析焊接过程中电弧形貌、电流电压和熔滴过渡方式变化以及焊缝成形、焊缝金属拉伸力学性能和X射线探伤结果，评估了吸烟功率变化时的吸烟效果以及吸烟行为对于焊接过程和焊缝质量的影响规律. 结果表明，使用环保焊枪可以显著降低小电流二氧化碳气体保护电弧焊时飘散在周围空间中的焊接烟尘. 吸烟过程虽然使得短路过渡熔滴频率略有增加，悬挂熔滴和电弧的稳定性略为变差，但对焊缝成形和焊接缺陷都无影响，焊缝金属屈服强度略有减小，抗拉强度略有增加.

Abstract:

Using environmental welding torch, low current CO₂ gas shielded arc welding at flat position was carried out to analyze the change of arc shape, current and voltage, the droplet transfer and weld formation, weld metal tensile mechanics and X-ray radiographic inspection. Fume extraction effect and its influence on welding process and weld quality were evaluated. The results showed that using environmental welding torch is able to dramatically low down the welding fume diffusion to the environment during the low current CO₂ gas shielding welding. It will not impact the shape of weld or cause welding defects, although the frequency of droplet transfer of short circuit transition is slightly quickened, the stabilities of suspend droplet and arc get a little worse. The yield strength of weld is slightly decreased, while the tensile strength is slightly increases.