1.It is easy to produce air hole when the flux is wet
2.If the welding speed is too fast, it is easy to produce welding porosity
3.Welding gas hole caused by welding wire rust or oil stain
4.The welding seam has rust, oxide film, grease and other organic impurities, resulting in welding porosity
5.It is easy to produce air hole when welding with improper polarity
6.Welding porosity caused by flux contamination
7.Insufficient height of flux is easy to produce welding porosity
8.If the height of flux is too high, the gas is not easy to escape and the welding porosity is easy to be produced
