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归纳并提出了熔焊时母材中碳进入熔池中的方式，在此基础上，探讨了焊态下熔焊接头中脱／增碳层的形成原因、形成时期以及焊缝不均匀混合区中的碳分布特点．得出：母材中碳以机械混合、母材团、扩散混合三种方式进入熔池；焊态下，母材侧不完全熔化区因碳扩散而形成了不明显的脱碳层，焊缝倒不均匀混合区因多种碳来源方式而形成了碳分布不均匀的增碳层。利用异种钢接头的金相观察和硬度测试结果，验证了所得结论的正确性。
Summarized and put forward the welding of base metal into the molten pool in the way, on this basis, to explore the welding state of welding seam in the dezincification / carbon layer forming reasons, the formation of the weld and the uneven mixing zone In the carbon distribution characteristics. The results show that the carbon in the parent metal enters the weld pool through mechanical mixing, base metal and diffusion mixing. In the welding state, the incomplete melting zone on the base metal side forms an obvious decarburized layer due to carbon diffusion. Inhomogeneous mixing area due to a variety of carbon sources form a carbon distribution uneven carbon layer. The results of metallographic observation and hardness test of dissimilar steel joints verify the correctness of the conclusions.