自保护药芯焊丝焊缝中的气体

Gas in weld for self-shielded flux-cored arc welding

自保护药芯焊丝焊缝中N元素含量较高在0.025%-0.035%内。分析了药芯成分(氟化物、碳酸盐和固氮元素铝)对焊缝中氮气孔的影响规律。焊接工艺参数对焊缝中氮气孔的产生也有重要的影响,从防止焊缝产生气孔的角度出发,焊接工艺参数的最佳取值范围为焊接电流220-280 A,电弧电压18-24 V,焊丝伸出长度20-30 mm,极性采用直流正接。自保护药芯焊丝焊缝中不容易产生氢气孔和CO,CO2气孔。

The nitrogen content in the weld for FACW-S(flux cored arc welding-self-shielded) is about 0.025%-0.035%,which is higher than other welding materials.The effects of flux ingredients(for example:fluoride,carbonate and nitrogen fixation substance Al)on the nitrogen gas pore were studied.The welding parameters also have an important influence on the nitrogen gas pore.Considering the gas pore in the weld,the welding parameters should be 220-280 A welding current,18-24 V welding voltage,20-30 mm wire extension and direct current stright polarity.Hydrogen gas pore and CO/CO2 gas pore are not easy to form in FCAW-S weld.