The laser melting and covering technology was used to intensify the seal surfaces of the components of the combined valves of methylamine pumps in the production line of urea.

• 采用激光熔覆技术对尿素生产线上的甲胺泵组合阀零件密封面进行强化，激光强化的熔层表面光整，加工余量小，基体无变形。