Furnace welding is a welding belong pressure, temperature and pressure are the main factors affecting the boiler tube weld quality. The chemical composition of the weld temperature and pressure but also by steel, heating temperature, marginalized and tube forming roll pass design and other factors.
Furnace welding is a welding belong pressure, temperature and pressure are the main factors affecting the boiler tube weld quality. The chemical composition of the weld temperature and pressure but also by steel, heating temperature, marginalized and tube forming roll pass design and other factors. Continuous furnace welding is one of the highest productivity and the cheapest method of production of low carbon steel pipe. Stove pipe expanding the scope of use, use it to replace welded steel pipe and seamless steel pipe, which is advantageous economically. This must be when the furnace welded steel pipe welded pipe to improve the quality and seamless level.
Not only determine the chemical composition of the possibility of pressure tube welding, but also limit the heating temperature factors. Practice has proved that carbon content greater than 0.3 to 0.5%, the soldering temperature increases and lower carbon content; and when the carbon content of less than 0.3 to 0.5%, with the increase of pressure weld strength and increase the carbon content of Great. This is because less pressure butt welding furnace, pressure alone can not get a good weld tube must be heated to a temperature close to the melting, to get good welds to ensure adequate strength. Carbon tube welded tubes are used to control the 0.3 to 0.5% or less. Tube or pipe from the boiler tube cut into lengthwise cut along the ingot, since the characteristics of boiling steel segregation, resulting in chemical composition at the edge of the tube on both sides are very different. Segregation serious tube tube makes it impossible to guarantee both edge and center part of the requirements of different temperatures, carbon and sulfur magazines more side when heated in a furnace, because when the temperature is too low, the solder is not on. Chromium, nickel, and the presence of non-ferrous metals, will produce dense oxide at the edges, because of slowing the rate of diffusion caused by welding difficult. Hair is one of the factors boiler tube weld quality. Because hair can blow off not only slag and oxide scale at the edge to improve the purity of the metal at the edges, and the temperature will rise 50 ~ 80 , for boiler tube weld metal to form a common crystal is extremely beneficial. Therefore, whether or not the quality will affect the wind pressure boiler tube weld wash speed, structure and shape of the wind and spray nozzle of the correct angle.
In addition, the edges of the tube defect can cause over-burning, bending waves and other waste. Impact on the quality assurance of precise welding furnace boiler tubes and pressure forming the correct pass welding machine design and selection pressure tube geometry and dimensions are to varying degrees.
Optimum efficiency control of high frequency welded pipe in welding process
In most cases, optimized welding process, power loss can be reduced 50% and can improve the welding quality, reduce downtime, increase production.
Stress on the trench corrosion of high-frequency straight seam resistance welding pipe
Trench etching is generally believed that acute heat in the welding process, the results of local tissue metal and chemical change caused by quenching.
Technology of straight seam high frequency resistance welded steel pipe
Factors that affect the raw material for the steel pipe welding quality affect the quality of raw materials are mainly steel mechanical properties unstable surface defects and strip geometry deviation big three aspects, therefore, we should focus on these three aspects of control.
