Our company takes part in the twenty-first Northeast welding exhibition.-Company News-北京北钨新材科技有限公司-北钨新材,钨极专家,北钨电极,突破创新,北京钨钼,钨电极,钨铼丝,钼丝,钨棒,钨片,钍钨,钼片,氩弧焊,线切割,铈钨