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用Ｇ－ＢＯＰ实验对药芯焊丝焊缝金属抗冷裂纹能力进行了研究，探讨了其机理，并提出了新的设想。对三种类型—碱性、酸性和金属型共２７种药芯焊丝焊缝金属的硬度、预热温度、扩散氢量、线能量、化学成份和微观结构等进行了测定，用回归分析法得到了焊缝金属裂纹率和诸因素之间的函数关系式。得出随药芯焊丝强度等级增加，硬度和碳当量增加，当碳当量Ｅ＿ｗ＞０．４时，焊缝金属裂纹率可达１００％；碱性药芯焊丝焊缝对裂纹敏感性要比酸性和金属型低；降低焊缝中的氢含量，可有效地降低裂纹敏感性．
The G-BOP experiment was used to study the cold crack resistance of the weld metal of the flux cored wire, the mechanism was discussed and a new concept was put forward. The hardness, preheating temperature, diffusible hydrogen content, line energy, chemical composition and microstructure of the weld metal of 27 types of flux-cored wires of three types - alkaline, acid and metal were measured and analyzed by regression analysis Weld metal cracking rate and the relationship between the various factors. The results show that with the increase of the strength of flux cored wire, the hardness and carbon equivalent increase. When the carbon equivalent E_w> 0.4, the weld metal cracking rate can reach 100%. The sensitivity of basic flux cored weld to crack is higher than that of acid And metal type is low; reduce the hydrogen content in the weld, which can effectively reduce the crack sensitivity.