Study of pulse combustion welding rod for vertical weld

A new type of manual SHS welding rod called the pulse combustion rod is introduced, which is used in the urgent repair of war.Firstly, the problems and insufficiency of the normal manual SHS welding rod(normal combustion rod for short) are analyzed in the vertical weld.The pulse combustion rod is designed with structure and constitution presented.Then vertical weld experiment is carried out, in which low carbon steel is used as the base metal.By analysis with SEM, XRD and EDS, the results show that weld seam is composed of Fe-riched phase and Cu-riched phase, with a few of α-Fe but a little of FeNi, ε-Cu and Cu_0.81Ni_0.19 contained in Fe-riched phase, and with much ε-Cu but a little of Cu_0.81Ni_0.19, α-Fe and FeNi contained in Cu-riched phase.Dendritic Fe-riched phase distributes in the solid solution of Cu-riched phase.The weld seam alloy has a good bond with the base metal.The aim of double sides forming is obtained by single side welding.The mechanical properties test of weld joint presents that tensile strength is up to 367MPa and the hardness of weld alloying zone is 143.8 HV.