采用天津三英焊业有限责任公司首次研制成功的碳钢钢带 30 8L超低碳不锈钢药芯焊丝 ,围绕药芯焊丝的增碳问题做了大量试验。试验结果证明 ,对于任何一种焊接方法 ,碳的氧化和还原反应在焊接过程中都是同时存在的。熔敷金属中的含碳量与焊接材料中的含碳量相比是增加还是减少 ,取决于焊接材料含碳量的多少和氧化性的强弱。对于药芯焊丝 ,增碳的门槛值在 0 .0 5%左右 Using the successful trial of Tianjin Sanying Welding Co., Ltd., the 30 8L ultra-low carbon stainless steel flux-cored welding wire has done a lot of experiments around the carbon-raising problem of the flux-cored welding wire. Test results show that, for any kind of welding method, carbon oxidation and reduction reactions are both in the welding process. The amount of carbon contained in the deposited metal increases or decreases as compared to the amount of carbon contained in the welding material, depending on how much carbon content the weld material is and the strength of the oxidation. For flux cored wire, the threshold for carbon addition is about 0.05%