For the welding process of Q235 steel plate with thickness of 12 mm,the influence of the welding parameters of flux cored wire transverse welding on the weld quality is discussed from the determination of some parameters before welding,welding parameters and weld detection results,etc.Standardized skill training was conducted for welding students who participated in skill competitions at all levels,and the comparison of skill training effect was analyzed. The results show that the welding current,power polarity,welding direction and welding technique are the key factors affecting the weld quality.The right welding method and direct current reverse welding method are preferred for CO,2, gas shielded flux cored wire transverse welding. The continuous welding method is used for filling layer and covering layer to ensure the weld quality.