At present, the increasing intensity of various field machinery operation puts forward higher requirements for emergency maintenance. Welding is one of the important technical means of equipment emergency maintenance. At present, the commonly used welding technologies are arc welding and gas welding, but the special geographical environment and harsh working conditions of the emergency maintenance site make it difficult to ensure the high-power power supply and gas storage equipment. Aiming at the field damage of equipment, the non electric welding technology without external power and gas source came into being.
it is an effective in-situ rapid repair technique.
1 electroless welding technology and characteristics electroless welding technology is an innovative development of self propagating high temperature synthesis (SHS) welding technology.
SHS welding uses the energy released by chemical reaction as the heat source and reaction products as solder to realize the firm connection between weldments. It has a wide application prospect in the welding of refractory metals, ceramics and intermetallic compounds, but the general SHS welding process also needs corresponding vacuum high-pressure reaction device and heating device, which is very inconvenient to operate. Non electric welding technology is a new welding method that makes advanced welding materials into a special hand-held welding pen, which only needs a match to ignite to trigger a reaction, uses the chemical energy released by the high heat agent itself as the welding heat source to melt the reaction products and the base metal, and realizes the firm combination of the welded base metal through the mechanisms of wetting, diffusion and reactive crystallization. It has the advantages of high temperature and in-situ welding, It shows good application potential in emergency maintenance. Compared with other welding methods, electroless welding technology has the following characteristics: (1) relying on the exothermic energy of its own chemical reaction as the welding heat source, some high exothermic systems can reach a very high temperature (3000 ~ 4000 ℃), so as to save energy.
(2) it does not need any power supply, air source and other equipment. It only needs a match to light. It is convenient to carry and simple to operate. It is suitable for rapid and timely emergency repair in field and other emergencies, and has high work efficiency.
(3) non electric welding is a fusion welding method, which is insensitive to the surface of base metal and has high strength. The tensile strength of non electric welding weld can reach 200 ~ 300mpa, the bending strength can reach 300 ~ 700MPa, and the impact toughness can reach 16 ~ 55j / cm2, which can effectively meet the emergency repair requirements of field engineering machinery.
(4) non electric welding has a wide range of applications, which can realize the welding of the same or different metal materials, and can be applied to the welding repair of a variety of mechanical equipment (machinery manufacturing industry waiting for industry recovery).
