Non-electric welding is a novel efficient technique for emergency maintenance, which utilizes the heat released by self-propagating combustion to join metals without needing arty power supply or gas sources. Non-elect...Non-electric welding is a novel efficient technique for emergency maintenance, which utilizes the heat released by self-propagating combustion to join metals without needing arty power supply or gas sources. Non-electric welding material, named non-electric welding pen, was prepared by utilizing highly-exothermic thermit （ Cud ＋ Al） with other additive powders. The effects of reactant particle size and mixing uniformity on the combustion characteristic of the welding pen were investigated. The results show that the particle size of reactant powder has a significant effect on combustion velocity. With increasing the particle size of reactant powder, the combustion velocity decreases obviously. Moreover, mixing uniformity and particle size are shown to be main factors influencing heat produced in single time, and accordingly affect the combustion temperature. Welding experiments were performed with 45 steel as the base material, and results show that the joint is of a metallurgie bonding with the tensile strength above 280 MPa, which proves non-electric welding a fusion welding technique.展开更多
文摘Non-electric welding is a novel efficient technique for emergency maintenance, which utilizes the heat released by self-propagating combustion to join metals without needing arty power supply or gas sources. Non-electric welding material, named non-electric welding pen, was prepared by utilizing highly-exothermic thermit （ Cud ＋ Al） with other additive powders. The effects of reactant particle size and mixing uniformity on the combustion characteristic of the welding pen were investigated. The results show that the particle size of reactant powder has a significant effect on combustion velocity. With increasing the particle size of reactant powder, the combustion velocity decreases obviously. Moreover, mixing uniformity and particle size are shown to be main factors influencing heat produced in single time, and accordingly affect the combustion temperature. Welding experiments were performed with 45 steel as the base material, and results show that the joint is of a metallurgie bonding with the tensile strength above 280 MPa, which proves non-electric welding a fusion welding technique.
