Usage of Welding Ceramic Liners
Semi-automatic CO2 gas shielded welding single-sided welding double-sided forming process is a welding method. It has a series of advantages such as high deposition rate, small groove angle, wide assembly gap, no root cleaning on the back, beautiful shape, small deformation, etc. It has been more and more widely used in the shipbuilding industry. Let’s learn about welding ceramic liners together. Let's use it!
1. Welding Ceramics - Groove Style
In order to achieve the purpose of effective welding, during the assembly process, the assembly gap should meet the lower limit as much as possible to reduce the amount of welding metal deposition. The direction of the groove is determined by the staged construction technology in principle, and the groove should be set on the side where welding is easy to implement. In order to facilitate on-site processing and ensure the correctness of the groove angle, after conversion, the relationship between plate thickness and groove width is listed in Table 1-1 for reference selection.
2. Welding Ceramics - Welding Standards
The welding specification of CO2 single-sided welding and double-sided forming technology is relatively flexible, which is related to the skill and proficiency of the welder. When selecting welding specifications, attention should be paid to the matching of welding current and voltage to ensure that the welding is well formed. In order to improve labor productivity, skilled welders can use high-current welding specifications. The maximum welding current shall not exceed 230A (wire diameter 1.2 ). The welding parameters shown in Table 4 and Table 5 can be selected as a reference.
3. Welding Ceramics - Operation Essentials
Welding Ceramic single-sided welding is a highly technical welding method. There are many factors affecting welding double-sided forming, such as equipment performance, climate, construction space environment, network voltage, personnel quality, etc., but the more important thing is the personnel quality. The quality of welders is reflected in aspects of cognition (theoretical level), skills, proficiency, and work attitude. Therefore, even if the appropriate welding standard parameters are used, the correct operation method and technical essentials must be mastered in order to obtain satisfactory welding quality.
3.1 Location of arcing point
When welding ceramics with single-sided welding, the position of the arc is very important. When CO2 single-sided welding is performed, due to the high current density of the arc, the base metal at the front end of the molten pool will form a semicircular hole. With the development of the arc, the molten metal will continue to fill the semicircular hole. During operation, the arcing point must be located in the center of the molten pool. If the arcing point is at the front, as shown at point b in Figure 3, the molten iron will flow too fast and the melting width will decrease. In severe cases, the two bottom edges will not be welded. If the arc point is too close, like point a in Figure 3, there will be too much slow flow in front of the molten iron, the molten width will increase, the weld bead will sag too much, and the front of the weld bead will easily form a shape with a high center and low sides. The slag is caught on both sides during welding. The conventional undercut welding shape should make the back side of the welding appropriately high, the center of the welding surface side low, and the two sides transition in an arc shape.
The above is the usage of welding ceramic backing. During cover welding, the standard parameters such as welding current, voltage and welding speed must be adjusted to ensure that the welding appearance is well formed, reduce the workload of repair welding and grinding, and truly improve welding productivity. The welding allowance is best controlled below 3. If it is long welding, the method of desoldering in stages, the method of welding in stages or the method of welding in stages can be used. When using the sub-welding method, try to use symmetrical welding to reduce welding deformation. When welding low-alloy steel, cast steel, and high-strength steel, necessary preheating measures must be taken. Specific requirements can follow the relevant welding technology.