Principles | Welding Technology Of Steel Sheets
1. Scientific and reasonable principle
In the Welding Technology Of Steel Sheets, workers need to take scientific and reasonable principles as the basis and carefully analyze them. When designing the welding process of sheet steel, it must be carried out strictly according to the design requirements. We can improve the quality and level of the whole welding through the strict design of the welding process. In the design process, according to the characteristics and properties of the sheet steel itself. It can ensure that the welding process is scientific and reasonable. In addition, in the design of welding technology, it is necessary to take rationality as the basis.
2. Quality first
In the process of welding process design, product quality must be taken as the primary goal. Through reasonable process design, the construction quality of each link of welding can be proved. And the final quality of products can be ensured. In addition, from the perspective of the quality of the product itself, to ensure that it has good performance. At the same time, it is also necessary to ensure that the whole project can meet the construction requirements and design requirements. In the construction, ensure that the construction personnel can be carried out in accordance with the construction requirements and standards, to ensure the safety and stability of the whole project.
3. Prevention
When designing the welding process, the principle of prevention should be fully considered. And the potential problems should be prevented according to the actual situation, so as to ensure that the whole project can meet the construction requirements. In the construction process, do a good job of safety measures to avoid safety accidents.
Causes And Influencing Factors Of Welding Deformation
Causes
Arc welding machine is widely used in 2mm thick steel plate, generally using arc welding equipment to carry out standardized welding. Arc welding machine uses a microcomputer control system. Workers can monitor the welding current, welding arc, welding speed and so on in real time. And we can also analyze various parameters in the welding process.
In the welding process of thin plate, some problems such as welding deformation and surface defects often occur. It is due to the high requirements of the welding process of thin plate. It leads to the change of various process parameters in the actual welding and affects the welding effect.
Due to the change of welding parameters, it is necessary to choose different welding materials and equipment under different external environments. This can avoid the influence of welding parameters. Therefore, in the actual welding operation, in order to better control the welding quality of thin plates, it is necessary to choose the appropriate welding method according to the specific situation.
In the welding process, the main types of deformation are transverse contractive bending deformation, triangle and torsion. Commonly used welding methods are, electrode arc welding, melting pole gas shielded welding, submerged arc welding, argon arc welding and so on.
Influencing Factors
In the Welding Technology Of Steel Sheets, because there are many types of deformation, the related influencing factors are more and more complex. According to the research, the welding deformation in the welding process is closely related to the thermophysical properties, welding method, welding heat input, welding position, joint form, welding sequence and so on. The deformation state of each factor is also different.
In production, if the heat is large, it will produce a large impact on the weld. And it will produce a large deformation. Because in the process of welding, more heat will be generated. If the position of the weld is relatively dense, then more thermal stress will be generated. It will lead to the deformation of the weld.
For the welding of thin plates, if a smaller weld pass is used for welding, it will have a certain restraint effect on the weld seam, resulting in a large deformation of the weld seam. In addition, because the weld is on the weldment, there is a certain gap between it and the weldment. It will also lead to weld deformation.
Quality Control | Welding Technology Of Steel Sheets
1. Selection Of Welding Process
The welding process is reasonable or not, will be directly related to the welding quality of the plate. Reasonable selection of welding technology can effectively improve the welding quality. In the development process of sheet welding, some effective methods can be taken to reduce solder joints and ensure the quality of welding through high strength welding wires. In addition, the use of low heat electrode can effectively suppress the solder joints of the plate, so as to improve the quality of the weld.
This is because in the welds of thin plates, the vertical bending in the welds is very sensitive to the temperature change of the welds. If there is a lot of heat in the weld, it will lead to the distortion of the weld of the plate. This can reduce the welding heat and can effectively control the welding deformation of the thin plate.
When welding, if the electrode diameter is too large, it will lead to the welding difficulty of the weld. And it is not easy to control. When choosing the welding process, it is necessary to select the suitable electrode and the suitable diameter. In addition, in the selection of welding wire, also need to pay attention to the temperature change during welding. When the temperature decreases, so does the molten metal in the wire. When selecting welding wire, workers should also analyze according to the actual situation.
2. Reasonable Application Of Spot Welding
Spot welding is a common welding technique at present. Spot welding can ensure the gap between the welds and make the welded steel plate have the corresponding resistance performance.
However, for the solder joints of thin steel plates, it is usually very special. The spacing, size and number of solder joints should be taken into account in the use of spot welding. If the size of spot welding is too small, cracks will appear in the welding process, thus affecting the quality of the product. If the spot welding is too large, it will not completely melt into the back of the weld. This will have an adverse effect on the overall performance of the weld.
And if the density of the welding point cannot reach the standard, the quality of the steel plate will be adversely affected. Therefore, the density of the solder joints must be controlled reasonably when the spot welding is carried out. In addition, the welding area and welding speed are also important factors affecting the effect of spot welding. In general, the distance between the two solder joints is 3~5mm.
If the solder joint spacing is too large, it will lead to an increase in the gap between the plates, thus reducing the welding effect. At the same time, the temperature of the solder joint will be too high. It will affect the quality and performance of the product. Therefore, it is necessary to design the spot welding reasonably and control the size of the solder spot accurately, so as to ensure the quality of the welding.
3. Control The Whole Welding Process
Before welding the sheet, the worker fastens the weld and then solders it. This can enhance the stiffness of the steel plate, so that the deformation of the weld can be controlled. For the welding of large-size steel plates, the steel plates at both ends of the plate are installed on the steel plate respectively. That can effectively reduce the deformation probability of welding. A smaller electrode can be used for pre-processing before spot welding. This can improve the stiffness of the weld, reduce the deformation of the weld and ensure the quality of the weld. According to the investigation, the deformation of weld can be effectively suppressed by using some special technology in welding process.
For example, the temperature difference method is used, or the temperature of the solder joint is reduced by reducing the welding heat, so that the deformation is smaller. However, the deformation of thin steel plate is still difficult to eliminate completely. Therefore, in order to solve the weld deformation problem of thin plate thoroughly, it is necessary to start from the root and deal with it. The results show that the low stress effect of thin-walled plate structure is the main reason for the formation of thin plate welds.
During construction, workers can reduce the stress condition of the sheet according to their respective horizontal temperature difference, so as to avoid the generation of temperature difference.
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