Welding alloy powder particle size
Welding alloy powder is an important material for many welding processes. The particle size of the alloy powder is one of the important criteria for judging the quality of the alloy powder. The smaller the particle size, the better the stability of the welding performance and the ability to meet the welding strength requirements. Therefore, it is important to measure the particle size of welding alloy powder in order to ensure that the welding process is performed successfully and up to quality standards.
In order to better control and standardize the particle size of welding alloy powder, Chinese standard JB / T 3168.1-1999 has been drafted. This standard applies to the particle size of gas atomized welding alloy powder, pressure atomized welding alloy powder, mechanically atomized welding alloy powder, prealloyed welding alloy powder and synthetic welding alloy powder. According to this standard, the particle size of welding alloy powder is generally divided into five classes, which are 0-50µm, 50-100µm ,100-200µm, 200-325µm,> 325µm.
The method of particle size measurement described in this standard is sieving analysis. The sieving analysis is divided into two parts: preparation before sieving and sieving. Before sieving, it is recommended to take the sample of the welding alloy powder in a sealed container, to prevent it from being affected by moisture and other factors, and then to place it in a sieve made of Wire cloth, stainless steel cloth or silk cloth. Then, the sample was screened with a mechanical or electromagnetic vibration sieve. After the sieving process, the sample was weighed by a particle size analyzer for measurement. The ratio of the weight of each corresponding sieving screen is used to determine the particle size of the welding alloy powder.
In addition, this standard also provides some instructions for the analysis of the particle size of welding alloy powder, such as how to count the data, how to calculate the average particle size, how to evaluate the particle size and what kind of test report should be produced.
In conclusion, the particle size of welding alloy powder is an important factor that affects the quality of the welding process and the stability of welding performance. JB / T 3168.1-1999 is an important Chinese national standard for measuring the particle size of welding alloy powder. By following this standard, users can be assured that their welding alloy powder meets the quality standards.
