What are the characteristics of ceramic liners?

The application of ceramic liners in our country is that in the 1980s, in order to improve welding efficiency and shorten the shipbuilding cycle, some large state-owned ship manufacturers invested heavily in technological transformation, introduced foreign equipment and materials, and adopted advanced welding technology for hull construction. Ceramic liners Gradually promote the application. In the 1990s, welded ceramic liners were completely localized, and the supporting equipment and technology were mature. At present, ceramic liners are widely used in shipbuilding, bridge construction, boilers, pressure dissolvers, steel structures, and auto parts.

What are the characteristics of ceramic liners?

Ceramic backing is an aluminum oxide painted material and is a widely used ceramic material in the welding process known as welding lining, mainly to ensure the root passage of joints of steel materials and the formation of the welding back. Is a good quality, low cost soldering method for forced soldering with pre-built hives along the back of the joint. (Note:) This welding method avoids the domestic work of root cleaning, post-welding and narrow closed loop, reduces the labor intensity of welders, doubles the welding productivity, ensures the welding quality, and has no harm to the human body and the environment. Compared with traditional welding methods, it is a sustainable "green" welding method with advanced technology and high welding quality.

The ceramic backing material used for welding has a weight ratio of each component of SiO2: 40% to 60%, Al2O3: 30% to 45%, Fe2O3: 0% to 1.2%, MgO and/or Na2O: 3

Around the molten pool of the ceramic liner is a model body consisting of a metal welded body and a liner. Because the thermal conductivity of the coating pad and the base metal is quite different, the heat release of the molten pool is in a very uneven state. The heat dissipation is fast on both sides of the molten pool and slow at the bottom. During normal welding, with the movement of the arc, the molten pool Crystallization begins on cooling. The heating temperature of the arc at the top of the molten pool is higher than that at the bottom, and the crystallization of the liquid metal in the molten pool crystallizes upward compared with the steel plate.

Ceramic backing is a widely used backing material for single-sided welding and double-sided shape. It is widely used in solid steel wire CO2 gas shielded semi-automatic welding, but it is not widely used in CO2 gas shielded semi-automatic welding that meets flux cored wire. For this reason, a CO2 gas shielded semi-automatic welding process with a ceramic backing flux cored wire is used for horizontal and vertical welding of bridge steel structures. Ceramic lining core CO2 welding does not require back root cleaning, polishing, post welding and workpiece, which solves the time and effort of carbon arc planing and root cleaning on the outside of the air box girder and the problem of carbon increase and welding toughness decrease during carbon arc planing . Flux cored wire CO2 welding can observe welding fusion in real time to avoid welding defects. At the same time, the melting speed is fast, the production efficiency is high, the gas and slag are jointly protected, the process performance is good, the spatter is less, and the welding formation is beautiful. It can also save materials, electricity, space, workload, shorten the construction period, etc.

The ceramic backing material used for welding has a weight ratio of each component of SiO2: 40% to 60%, Al2O3: 30% to 45%, Fe2O3: 0% to 1.2%, MgO and/or Na2O: 3

Around the molten pool of the ceramic liner is a model body consisting of a metal welded body and a liner. Because the thermal conductivity of the coating pad and the base metal is quite different, the heat release of the molten pool is in a very uneven state. The heat dissipation is fast on both sides of the molten pool and slow at the bottom. During normal welding, with the movement of the arc, the molten pool Crystallization begins on cooling. The heating temperature of the arc at the top of the molten pool is higher than that at the bottom, and the crystallization of the liquid metal in the molten pool crystallizes upward compared with the steel plate.

Ceramic backing ​is a widely used backing material for single-sided welding and double-sided shape. It is widely used in semi-automatic welding of solid steel wire CO2 gas protection, but not much for CO2 gas protection semi-automatic welding of flux-cored wire. For this reason, a CO2 gas shielded semi-automatic welding process with a ceramic backing flux cored wire is used for horizontal and vertical welding of bridge steel structures. Ceramic lining core CO2 welding does not require back root cleaning, polishing, post welding and workpiece, which solves the time and effort of carbon arc planing and root cleaning on the outside of the air box girder and the problem of carbon increase and welding toughness decrease during carbon arc planing . Flux cored wire CO2 welding can observe welding fusion in real time to avoid welding defects. At the same time, the melting speed is fast, the production efficiency is high, the gas and slag are jointly protected, the process performance is good, the spatter is less, and the welding formation is beautiful. It can also save materials, electricity, space, workload, shorten the construction period, etc.