一、前言随着等离子电弧技术在切割、喷镀、焊接方面的应用,近几年来,将等离子电弧用作金属表面喷焊方面,也获得很大的进展。采用粉末等离子电弧喷焊,还是国内目前一项比较新的工艺。由于它的独特的优越性,为机械零件表面硬化开辟了更为广泛的途径。粉末材料,它不像丝极材料那样,受铸造、轧制、拉丝等加工工艺的限制,人们依 I. INTRODUCTION With the application of plasma arc technology in cutting, spraying and welding, in recent years, the plasma arc has been used as a metal surface spray welding, and great progress has also been made. The use of powder plasma arc welding, or the current domestic relatively new technology. Due to its unique superiority, surface hardening of mechanical parts has opened up a wider range of ways. Powder material, it is not like the filament material, by the casting, rolling, drawing and other processing restrictions, people rely on