The targeted optimization and improvement measures are proposed by summarizing and analyzing the exist-ing quality problems of ER70S-6 welding wire steel. The emphasis is strictly controlling such key indicators as chemical composition range,gaseous nitrogen content,dimensional accuracy and microstructure of ER70S-6 welding wire steel. After tackling the problems,rates of reaching the standard for internal control of C,Si,Mn,and N contents are improved,class C accuracy of dimensional deviation is improved as well as abnormal duplex grain structure is eliminated. The drawing results of users showed that the quality of optimized welding wire steel were further improved,which could meet the require-ments of high speed drawing with drawing speed of over 28 m/s.
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