What is the influence of the temperature of wave soldering furnace on the welding quality
2021-04-09 Classify: Products Information Author: GrandSeed Browse: 534
The temperature of the wave soldering furnace has a great influence on the welding quality. The wave soldering temperature depends on the temperature needed for the formation of the best state of the solder joint. Here it refers to the temperature of the solder melt. The actual temperature often deviates from the temperature set by the computer. Before welding, the actual measurement must be carried out. Use a calibrated thermometer or electronic thermometer to measure the temperature at each point of the bath. Modify the parameters set by the computer according to the actual temperature value. When the design temperature is basically reached, it will run for 4 minutes without any load and make the temperature distribution uniform.
The temperature of the wave soldering furnace has an effect on the welding quality. The process temperature of PCB preheating fluctuates up and down, and the welding effect will change immediately. If the variation is too large, the preheating process temperature exceeds the limit value, it will cause the formation of solder joint method, false welding, too thick or too thin welding layer, bridging and other adverse phenomena. The influence of environment and temperature on the temperature time curve of preheating process can be seen.
Wave soldering furnace temperature required for lead-free tin bar: if it is tin silver copper alloy, the actual temperature needs 255; In case of tin copper alloy, the actual temperature is above 260. The temperature of tin furnace is generally set at more than 50 ℃ higher than the melting point of solder.
When the ambient temperature changes greatly, if the temperature is low, the fluidity of solder wave will become poor, and the surface tension will be high, which will easily cause welding defects such as false soldering and pulling, and lose the advantages of wave soldering, Generally, 6N is not used as a direct force bearing structure, and each welding spot bears 3N force, which is different from stud welding. The force is only the moment of assembly and has enough welding area to support, If the structure is not changed, each solder joint of 6N will bear a force of 3N, which is different from the stud welding. The force is only the moment of assembly and there is enough welding area to support. If the structure is not changed, if the temperature is too high, the component may be damaged, Enhance solder oxidation.