Mix structure of high nitrogen austenitic stainless steel and 316L stainless steel formed by wire and arc additive manufacturing based on size controlling of beads

Abstract

Wires of high nitrogen austenitic stainless steel and 316L stainless steel were used, the surface forming characteristics of single bead, single-bead multi-layer and single-layer multi-bead were analyzed on high nitrogen austenitic stainless steel, better process parameters were screened. The most suitable process parameters of forming mix structure were obtained by size controlling of both beads. The optimum step-over distance of both beads was obtained by different step-over distance experiments, and mix structure was formed by wire and arc additive manufacturing with a reasonable path. The results show that the varies of process parameters have a great influence on surface forming characteristics of high nitrogen austenitic stainless steel beads, which pores emerge easily on the bead surface; the matching error method on geometry size and cross section area of both beads is proposed, by which optimum process parameters are obtained. The wire-feed rate of two wires are 5.7 m/min and 5.6 m/min, welding speed are both 0.6 m/min. Forming precision of mix structure is improved by reducing the number of arcing times and adopting a closed path, in addition, post processing decr-eases.

Keywords

• mix structure
• high nitrogen austenitic stainless steel
• forming characteristic
• geometry size
• matching error method
• path