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This paper shows a new type of manual SHS welding rod for normal carbon steel, called the pulse combustion rod. The structure and constitution of the pulse combustion rod was designed after the analysis of the problems and insufficiency of the normal manual SHS welding rod (normal combustion rod for short) in the vertical welding. Then the low carbon steel as the base metal was used for vertical weld experiment. Analysis of SEM, XRD and EDS shows that weld seam is composite of Fe-riched phase and Cu-riched phase, with much α-Fe but a little FeNi, ε-Cu and Cu0.81Ni0.19contained in Fe-riched phase, and with much ε-Cu but a little Cu0.81Ni0.19, α-Fe and FeNi contained in Cu-riched phase. The interfacial adhesion between Cu-rich phase and Fe-rich phase is effectively improved for the Ni content in two phases is roughly the same. The weld seam alloy has a good bond with the base metal. The mechanical properties test of weld joint present that tensile strength is up to 367MPa and the hardness of weld alloying zone is HV143.8. |
