What will happen if the welding process of stainless steel heat exchange tubes is improper?
By: mxgy,
Improper welding process of stainless steel heat exchange tubes can cause a series of problems that affect their performance and safety.
Firstly, it is easy to produce welding quality defects, such as incomplete penetration, weld bead, porosity or cracks. Incomplete penetration can lead to insufficient strength at the interface, which is prone to fracture when subjected to medium pressure or thermal expansion and contraction; Weld bead will protrude on the inner wall of the pipe, reducing the flow cross-section, hindering fluid flow, and may also increase the risk of local scaling, affecting heat transfer efficiency; Pores and cracks can become hidden dangers for medium leakage, especially when transporting corrosive or high-temperature and high-pressure media, making leakage more difficult to control.
Secondly, it will damage the corrosion resistance of the pipe material. Stainless steel heat exchange tubes rely on surface oxide films for corrosion resistance. If the heat input is not appropriate during welding (such as high temperature or rapid cooling), a sensitization zone will be formed in the heat affected zone, leading to the precipitation of chromium elements, damaging the integrity of the oxide film, and greatly reducing the corrosion resistance of this area. In subsequent use, intergranular corrosion or pitting corrosion are prone to occur, which can lead to thinning and perforation of the pipe wall.
In addition, improper welding process may also cause deformation of the tube body, such as uneven heating during welding leading to bending and necking of the heat exchange tube, which not only affects the assembly sealing with the tube plate, but also may change the flow state of the fluid inside the tube, reducing the overall heat transfer effect; At the same time, if residual stress is not eliminated in a timely manner after welding, long-term stress concentration will intensify under alternating cold and hot working conditions, which may cause stress corrosion cracking, shorten the service life of heat exchange tubes, and in severe cases, even lead to the shutdown and maintenance of heat exchange equipment, affecting production progress.
What will happen if the welding process of stainless steel heat exchange tubes is improper?
By: mxgy,
Improper welding process of stainless steel heat exchange tubes can cause a series of problems that affect their performance and safety.
Firstly, it is easy to produce welding quality defects, such as incomplete penetration, weld bead, porosity or cracks. Incomplete penetration can lead to insufficient strength at the interface, which is prone to fracture when subjected to medium pressure or thermal expansion and contraction; Weld bead will protrude on the inner wall of the pipe, reducing the flow cross-section, hindering fluid flow, and may also increase the risk of local scaling, affecting heat transfer efficiency; Pores and cracks can become hidden dangers for medium leakage, especially when transporting corrosive or high-temperature and high-pressure media, making leakage more difficult to control.
Secondly, it will damage the corrosion resistance of the pipe material. Stainless steel heat exchange tubes rely on surface oxide films for corrosion resistance. If the heat input is not appropriate during welding (such as high temperature or rapid cooling), a sensitization zone will be formed in the heat affected zone, leading to the precipitation of chromium elements, damaging the integrity of the oxide film, and greatly reducing the corrosion resistance of this area. In subsequent use, intergranular corrosion or pitting corrosion are prone to occur, which can lead to thinning and perforation of the pipe wall.
In addition, improper welding process may also cause deformation of the tube body, such as uneven heating during welding leading to bending and necking of the heat exchange tube, which not only affects the assembly sealing with the tube plate, but also may change the flow state of the fluid inside the tube, reducing the overall heat transfer effect; At the same time, if residual stress is not eliminated in a timely manner after welding, long-term stress concentration will intensify under alternating cold and hot working conditions, which may cause stress corrosion cracking, shorten the service life of heat exchange tubes, and in severe cases, even lead to the shutdown and maintenance of heat exchange equipment, affecting production progress.
